{"id":8690,"date":"2026-02-04T10:17:24","date_gmt":"2026-02-04T02:17:24","guid":{"rendered":"https:\/\/www.uneedpm.com\/?p=8690"},"modified":"2026-03-17T20:32:05","modified_gmt":"2026-03-17T12:32:05","slug":"precipitation-hardening-process-applications","status":"publish","type":"post","link":"https:\/\/www.uneedpm.com\/cs\/precipitation-hardening-process-applications\/","title":{"rendered":"Sr\u00e1\u017ekov\u00e9 kalen\u00ed: Proces a aplikace"},"content":{"rendered":"<p>Sr\u00e1\u017eec\u00ed kalen\u00ed, naz\u00fdvan\u00e9 tak\u00e9 kalen\u00ed v\u011bkem, je metoda tepeln\u00e9ho zpracov\u00e1n\u00ed, kter\u00e1 m\u016f\u017ee n\u011bkter\u00e9 kovov\u00e9 slitiny v\u00fdrazn\u011b zpevnit, ani\u017e by se zm\u011bnil tvar d\u00edlu. Pokud jste n\u011bkdy pot\u0159ebovali leh\u010d\u00ed dr\u017e\u00e1k, tu\u017e\u0161\u00ed h\u0159\u00eddel nebo tvrd\u0161\u00ed vlo\u017eku do formy, ale nemohli jste ji ud\u011blat siln\u011bj\u0161\u00ed, je sr\u00e1\u017eec\u00ed kalen\u00ed \u010dasto \u0159e\u0161en\u00edm. Funguje d\u00edky tomu, \u017ee se uvnit\u0159 kovov\u00e9 matrice tvo\u0159\u00ed drobn\u00e9 \u010d\u00e1stice zvan\u00e9 precipit\u00e1ty, kter\u00e9 blokuj\u00ed pohyb dislokac\u00ed (drobn\u00e9 posuny v krystalu, kter\u00e9 umo\u017e\u0148uj\u00ed oh\u00fdb\u00e1n\u00ed kovu). Tento pr\u016fvodce se zab\u00fdv\u00e1 t\u00edm, co to je, pro\u010d to funguje, p\u0159esn\u00fdmi t\u0159emi kroky (\u00faprava roztokem \u2192 kalen\u00ed \u2192 st\u00e1rnut\u00ed) a na co si d\u00e1t pozor v re\u00e1ln\u00fdch podm\u00ednk\u00e1ch d\u00edlny, jako je deformace, riziko koroze a chyb\u011bj\u00edc\u00ed tvrdost.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Co je st\u00e1rnut\u00ed?<\/h2>\n\n\n\n<p>Kdy\u017e se lid\u00e9 ptaj\u00ed, co je to sr\u00e1\u017ekov\u00e9 kalen\u00ed, obvykle cht\u011bj\u00ed nejprve jasnou definici, a teprve potom \u201cjak\u201d a \u201ckdy\u201d.\u201d<\/p>\n\n\n\n<p>Sr\u00e1\u017ekov\u00e9 kalen\u00ed je proces tepeln\u00e9ho zpracov\u00e1n\u00ed, kter\u00fd se pou\u017e\u00edv\u00e1 u vybran\u00fdch kovov\u00fdch slitin - zejm\u00e9na hlin\u00edkov\u00fdch slitin, nerezov\u00e9 oceli kalen\u00e9 sr\u00e1\u017ekou a vysokoteplotn\u00edch slitin na b\u00e1zi niklu - ke zv\u00fd\u0161en\u00ed meze kluzu a tvrdosti. M\u016f\u017eete jej tak\u00e9 sly\u0161et pod n\u00e1zvy precipita\u010dn\u00ed tepeln\u00e9 zpracov\u00e1n\u00ed, \u010d\u00e1sticov\u00e9 kalen\u00ed, disperzn\u00ed kalen\u00ed, rozpu\u0161t\u011bn\u00ed (pro prvn\u00ed krok), um\u011bl\u00e9 st\u00e1rnut\u00ed nebo p\u0159irozen\u00e9 st\u00e1rnut\u00ed (pro posledn\u00ed krok).<\/p>\n\n\n\n<p>Pou\u017e\u00edv\u00e1 se, pokud chcete m\u00edt po tv\u00e1\u0159en\u00ed a obr\u00e1b\u011bn\u00ed pevn\u00fd d\u00edl. Mnoho t\u00fdm\u016f nap\u0159\u00edklad d\u011bl\u00e1 <a href=\"https:\/\/www.uneedpm.com\/cs\/cnc-turning\/\">CNC soustru\u017een\u00ed<\/a> a <a href=\"https:\/\/www.uneedpm.com\/cs\/cnc-milling\/\">fr\u00e9zov\u00e1n\u00ed<\/a> s ohledem na precipita\u010dn\u00ed kalen\u00ed: obr\u00e1b\u011bj\u00ed se v m\u011bk\u010d\u00edm stavu pro zv\u00fd\u0161en\u00ed \u017eivotnosti a stability n\u00e1stroje, pot\u00e9 se d\u00edl zest\u00e1rne, aby se zajistily kone\u010dn\u00e9 mechanick\u00e9 vlastnosti.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Definice, alternativn\u00ed term\u00edny a m\u00edsta pou\u017eit\u00ed (Al, PH nerez, Ni)<\/h3>\n\n\n\n<p>Tato l\u00e9\u010dba je b\u011b\u017en\u00e1 u:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sr\u00e1\u017ekov\u011b tvrzen\u00fd hlin\u00edk (mnoho konstruk\u010dn\u00edch slitin hlin\u00edku \u0159ad 2xxx, 6xxx a 7xxx).<\/li>\n\n\n\n<li>Sr\u00e1\u017een\u00edm kalen\u00e1 nerezov\u00e1 ocel (\u010dasto naz\u00fdvan\u00e1 PH nerez; mezi obl\u00edben\u00e9 druhy pat\u0159\u00ed slitiny typu 17-4 PH, 15-5 PH a 13-8).<\/li>\n\n\n\n<li>Slitiny niklu pou\u017e\u00edvan\u00e9 p\u0159i vy\u0161\u0161\u00edch teplot\u00e1ch (zn\u00e1m\u00fdm p\u0159\u00edkladem je slitina 718).<\/li>\n<\/ul>\n\n\n\n<p>Tvrdnut\u00ed vlivem st\u00e1rnut\u00ed lze pozorovat tak\u00e9 u n\u011bkter\u00fdch slitin m\u011bdi (v\u010detn\u011b slitin m\u011bdi, kter\u00e9 si zachov\u00e1vaj\u00ed dobrou vodivost) a u n\u011bkter\u00fdch slitin titanu.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pro\u010d se pevnost zvy\u0161uje: dislokace blokovan\u00e9 jemn\u00fdmi precipit\u00e1ty<\/h3>\n\n\n\n<p>Uvnit\u0159 kovu pevnost hodn\u011b z\u00e1vis\u00ed na tom, jak snadno se mohou dislokace pohybovat. Pokud se dislokace pohybuj\u00ed snadno, kov se poddaj\u00ed (za\u010dne trval\u00fd ohyb) p\u0159i ni\u017e\u0161\u00edm nap\u011bt\u00ed. Sr\u00e1\u017ekov\u00e9 kalen\u00ed p\u0159id\u00e1v\u00e1 uvnit\u0159 krystalov\u00e9 m\u0159\u00ed\u017eky \u201cdopravn\u00ed z\u00e1cpu\u201d.<\/p>\n\n\n\n<p>Po spr\u00e1vn\u00e9m zah\u0159\u00e1t\u00ed a ochlazen\u00ed se ve slitin\u011b vytvo\u0159\u00ed mnoho jemn\u00fdch precipita\u010dn\u00edch \u010d\u00e1stic rozpt\u00fdlen\u00fdch v matrici. Tyto \u010d\u00e1stice blokuj\u00ed dislokace dv\u011bma hlavn\u00edmi zp\u016fsoby:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pokud jsou \u010d\u00e1stice velmi mal\u00e9 a dob\u0159e \u201cpasuj\u00ed\u201d do m\u0159\u00ed\u017eky, mohou se jimi dislokace sna\u017eit prorazit.<\/li>\n\n\n\n<li>Pokud jsou \u010d\u00e1stice v\u011bt\u0161\u00ed nebo m\u00e9n\u011b shodn\u00e9, dislokace maj\u00ed tendenci se kolem nich obt\u00e1\u010det (\u010dasto se tomu \u0159\u00edk\u00e1 obch\u00e1zen\u00ed nebo smy\u010dkov\u00e1n\u00ed).<\/li>\n<\/ul>\n\n\n\n<p>V mnoha syst\u00e9mech zpevn\u011bn\u00fdch st\u00e1rnut\u00edm plat\u00ed u\u017eite\u010dn\u00e9 pravidlo, \u017ee k maxim\u00e1ln\u00edmu zpevn\u011bn\u00ed \u010dasto doch\u00e1z\u00ed, kdy\u017e jsou precipit\u00e1ty velmi mal\u00e9 - \u0159\u00e1dov\u011b o polom\u011bru 5-30 nm - proto\u017ee rozte\u010d a soudr\u017enost jsou pr\u00e1v\u011b takov\u00e9, aby odol\u00e1valy pohybu dislokac\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Co by m\u011bli u\u017eivatel\u00e9 o\u010dek\u00e1vat: typick\u00e9 zisky a typick\u00e9 limity<\/h3>\n\n\n\n<p>Lid\u00e9 miluj\u00ed zpev\u0148ov\u00e1n\u00ed sr\u00e1\u017eek, proto\u017ee skok v pevnosti m\u016f\u017ee b\u00fdt dramatick\u00fd. Kl\u00ed\u010dov\u00e9 je, \u017ee nejde o \u201cmagickou pevnost\u201d. Z\u00edsk\u00e1te pevnost, ale m\u016f\u017eete se vzd\u00e1t ta\u017enosti, hou\u017eevnatosti nebo korozn\u00edch vlastnost\u00ed v z\u00e1vislosti na slitin\u011b a podm\u00ednk\u00e1ch st\u00e1rnut\u00ed.<\/p>\n\n\n\n<p>Zde jsou uvedeny realistick\u00e9, b\u011b\u017en\u011b uv\u00e1d\u011bn\u00e9 rozsahy, kter\u00e9 pom\u00e1haj\u00ed stanovit o\u010dek\u00e1v\u00e1n\u00ed:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>V mnoha hlin\u00edkov\u00fdch syst\u00e9mech se m\u016f\u017ee mez kluzu pohybovat od zhruba 50-100 MPa v m\u011bkk\u00e9m\/pochlazen\u00e9m stavu a\u017e po 300-500+ MPa po \u0161pi\u010dkov\u00e9m st\u00e1rnut\u00ed (hodn\u011b z\u00e1le\u017e\u00ed na slitin\u011b a temperaci).<\/li>\n\n\n\n<li>U b\u011b\u017en\u00fdch PH nerezov\u00fdch t\u0159\u00edd m\u016f\u017ee mez kluzu vzr\u016fst ze zhruba 720-800 MPa po \u00faprav\u011b roztokem na 1100-1200+ MPa po vysokopevnostn\u00edm st\u00e1rnut\u00ed.<\/li>\n\n\n\n<li>U slitiny Alloy 718 dosahuje spr\u00e1vn\u011b zest\u00e1rl\u00fd materi\u00e1l b\u011b\u017en\u011b meze kluzu &gt;1000 MPa p\u0159i pokojov\u00e9 teplot\u011b a v mnoha aplikac\u00edch si zachov\u00e1v\u00e1 vysokou v\u00fdkonnost a\u017e do zhruba 650 \u00b0C.<\/li>\n<\/ul>\n\n\n\n<p>Tak\u017ee ano, sr\u00e1\u017ekov\u00e9 kalen\u00ed m\u016f\u017ee slitinu hodn\u011b zpevnit. Omezen\u00edm je, \u017ee tyto precipit\u00e1ty mohou zhrubnout nebo se rozpustit, pokud je sou\u010d\u00e1st p\u0159\u00edli\u0161 dlouho hork\u00e1, a n\u011bkter\u00e9 podm\u00ednky \u0161pi\u010dkov\u00e9 pevnosti mohou zv\u00fd\u0161it riziko vzniku trhlin zp\u016fsoben\u00fdch koroz\u00ed pod nap\u011bt\u00edm.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/2-1024x768.webp\" alt=\"sr\u00e1\u017ekov\u00e9 kalen\u00ed\" class=\"wp-image-8694\" srcset=\"https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/2-1024x768.webp 1024w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/2-300x225.webp 300w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/2-768x576.webp 768w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/2-16x12.webp 16w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/2.webp 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Proces sr\u00e1\u017eec\u00edho kalen\u00ed (t\u0159\u00edstup\u0148ov\u00e9 tepeln\u00e9 zpracov\u00e1n\u00ed)<\/h2>\n\n\n\n<p>Pokud si zapamatujete jen jednu v\u011bc, zapamatujte si toto: proces sr\u00e1\u017een\u00ed a tvrdnut\u00ed zahrnuje t\u0159i z\u00e1kladn\u00ed kroky.<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>O\u0161et\u0159en\u00ed roztokem (solutionizing)<\/li>\n\n\n\n<li>Ochlazov\u00e1n\u00ed (rychl\u00e9 chlazen\u00ed)<\/li>\n\n\n\n<li>St\u00e1rnut\u00ed (p\u0159irozen\u00e9 nebo um\u011bl\u00e9)<\/li>\n<\/ol>\n\n\n\n<p>Tato sekvence p\u0159\u00edmo odpov\u00edd\u00e1 na dv\u011b \u010dast\u00e9 ot\u00e1zky: Jak\u00e9 jsou t\u0159i kroky p\u0159i zpev\u0148ov\u00e1n\u00ed sr\u00e1\u017een\u00edm? a Jak\u00e9 jsou t\u0159i kroky p\u0159i zpev\u0148ov\u00e1n\u00ed st\u00e1rnut\u00edm? Jsou to stejn\u00e9 t\u0159i kroky.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Krok 1 - O\u0161et\u0159en\u00ed roztokem (rozpu\u0161t\u011bn\u00ed): \u00fa\u010del + typick\u00e9 rozsahy<\/h3>\n\n\n\n<p>Zpracov\u00e1n\u00ed roztokem znamen\u00e1 zah\u0159\u00e1t\u00ed slitiny na dostate\u010dn\u011b vysokou teplotu, aby se leguj\u00edc\u00ed prvky rozpustily do jednof\u00e1zov\u00e9ho pevn\u00e9ho roztoku. Zjednodu\u0161en\u011b \u0159e\u010deno, zah\u0159\u00edv\u00e1te ji tak, aby se \u201cslo\u017eky\u201d rovnom\u011brn\u011b rozlo\u017eily.<\/p>\n\n\n\n<p>P\u0159esn\u00e1 teplota z\u00e1vis\u00ed na rodin\u011b slitin. Jde o to, aby byla dostate\u010dn\u011b hork\u00e1, aby se rozpustily zpev\u0148uj\u00edc\u00ed f\u00e1ze, ale ne tak hork\u00e1, aby se roztavila nebo po\u0161kodila struktura.<\/p>\n\n\n\n<p>N\u00ed\u017ee jsou uvedeny typick\u00e9 rozsahy zpracov\u00e1n\u00ed roztoku (na \u00farovni rodiny).<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Rodina slitin<\/th><th class=\"has-text-align-center\" data-align=\"center\">Typick\u00e1 teplota zpracov\u00e1n\u00ed roztoku<\/th><th class=\"has-text-align-center\" data-align=\"center\">Praktick\u00e9 pozn\u00e1mky (pro\u010d je to d\u016fle\u017eit\u00e9)<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">St\u00e1\u0159\u00edm kaliteln\u00e9 hlin\u00edkov\u00e9 slitiny<\/td><td class=\"has-text-align-center\" data-align=\"center\">~500-540\u00b0C<\/td><td class=\"has-text-align-center\" data-align=\"center\">Pe\u010dliv\u00e1 kontrola pom\u00e1h\u00e1 p\u0159edch\u00e1zet p\u0159eh\u0159\u00e1t\u00ed a taven\u00ed na hranici zrna. Doba udr\u017een\u00ed z\u00e1vis\u00ed na tlou\u0161\u0165ce.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">PH nerezov\u00e1 ocel<\/td><td class=\"has-text-align-center\" data-align=\"center\">~1040-1065\u00b0C<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u010casto n\u00e1sleduje rychl\u00e9 zchlazen\u00ed, aby se p\u0159ed zr\u00e1n\u00edm udr\u017eel m\u011bkk\u00fd a zpracovateln\u00fd stav.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Slitina niklu Slitina 718<\/td><td class=\"has-text-align-center\" data-align=\"center\">~980-995\u00b0C<\/td><td class=\"has-text-align-center\" data-align=\"center\">Obvykle se spojuje s definovan\u00fdm v\u00edcestup\u0148ov\u00fdm cyklem st\u00e1rnut\u00ed, aby se vytvo\u0159ily spr\u00e1vn\u00e9 sra\u017eeniny.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>B\u011bhem rozpu\u0161t\u011bn\u00ed se tak\u00e9 sni\u017euje chemick\u00e1 \u201cnejednotnost\u201d z p\u0159edchoz\u00edho zpracov\u00e1n\u00ed. To v\u00e1m pozd\u011bji pom\u016f\u017ee dos\u00e1hnout rovnom\u011brn\u011bj\u0161\u00edho rozlo\u017een\u00ed sra\u017eenin, co\u017e je d\u016fle\u017eit\u00e9 pro konzistentn\u00ed tvrdost po CNC obr\u00e1b\u011bn\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Krok 2 - kalen\u00ed: volba m\u00e9dia, intenzita kalen\u00ed, riziko deformace<\/h3>\n\n\n\n<p>Po rozpu\u0161t\u011bn\u00ed se d\u00edl rychle ochlad\u00ed - \u010dasto se ozna\u010duje jako kalen\u00ed. C\u00edlem je \u201czmrazit\u201d p\u0159esycen\u00fd pevn\u00fd roztok, co\u017e znamen\u00e1, \u017ee z\u016fstane rozpu\u0161t\u011bno v\u00edce leguj\u00edc\u00edch prvk\u016f, ne\u017e by bylo za norm\u00e1ln\u00edch okolnost\u00ed stabiln\u00ed p\u0159i pokojov\u00e9 teplot\u011b.<\/p>\n\n\n\n<p>Tento krok je d\u016fvodem, pro\u010d se lid\u00e9 ptaj\u00ed: Jak\u00fd je rozd\u00edl mezi sr\u00e1\u017ekov\u00fdm kalen\u00edm a kalen\u00edm? Kalen\u00ed je pouze prost\u0159edn\u00ed krok. Samotn\u00e9 kalen\u00ed ned\u00e1v\u00e1 kone\u010dnou pevnost sr\u00e1\u017eec\u00edho kalen\u00ed. Kalen\u00ed vytv\u00e1\u0159\u00ed v\u00fdchoz\u00ed bod (p\u0159esycen\u00ed). St\u00e1rnut\u00ed je krok, kter\u00fd ve skute\u010dnosti vytv\u00e1\u0159\u00ed sra\u017eeniny, kter\u00e9 prov\u00e1d\u011bj\u00ed zpevn\u011bn\u00ed.<\/p>\n\n\n\n<p>Mezi ochlazovac\u00ed m\u00e9dia obvykle pat\u0159\u00ed voda, roztoky polymer\u016f, olej nebo nucen\u00fd vzduch. Kompromis je jednoduch\u00fd:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rychlej\u0161\u00ed kalen\u00ed sni\u017euje ne\u017e\u00e1douc\u00ed \u010dasn\u00e9 sr\u00e1\u017een\u00ed a pom\u00e1h\u00e1 dos\u00e1hnout vy\u0161\u0161\u00ed maxim\u00e1ln\u00ed pevnosti.<\/li>\n\n\n\n<li>Rychlej\u0161\u00ed kalen\u00ed tak\u00e9 zvy\u0161uje riziko deformace, zbytkov\u00e9ho nap\u011bt\u00ed a vzniku trhlin - zejm\u00e9na u tenk\u00fdch nebo slo\u017eit\u00fdch tvar\u016f.<\/li>\n<\/ul>\n\n\n\n<p>Pokud jste n\u011bkdy vyt\u00e1hli tenk\u00fd krou\u017eek z prudk\u00e9ho kalen\u00ed a sledovali, jak se \u201c\u0161t\u011bp\u00ed\u201d, u\u017e v\u00edte, pro\u010d je pl\u00e1nov\u00e1n\u00ed kalen\u00ed d\u016fle\u017eit\u00e9. P\u0159\u00edpravky, orientace d\u00edl\u016f, \u0159\u00edzen\u00ed m\u00edch\u00e1n\u00ed a v\u00fdb\u011br kalic\u00edho m\u00e9dia se spr\u00e1vnou p\u0159\u00edsnost\u00ed mohou zachr\u00e1nit celou s\u00e9rii.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Krok 3 - St\u00e1rnut\u00ed: p\u0159irozen\u00e9 vs. um\u011bl\u00e9; jedno- vs. v\u00edcestup\u0148ov\u00e9 cykly<\/h3>\n\n\n\n<p>St\u00e1rnut\u00ed je m\u00edsto, kde doch\u00e1z\u00ed k \u00famysln\u00e9mu sr\u00e1\u017een\u00ed. Slitinu udr\u017eujete p\u0159i teplot\u011b st\u00e1rnut\u00ed, p\u0159i kter\u00e9 se atomy mohou pohybovat natolik, aby se vytvo\u0159ilo mnoho mal\u00fdch sra\u017eenin, ale ne tolik, aby rychle zhrubly.<\/p>\n\n\n\n<p>Existuj\u00ed dva hlavn\u00ed styly:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>P\u0159irozen\u00e9 st\u00e1rnut\u00ed: d\u00edl \u010dasem st\u00e1rne p\u0159i pokojov\u00e9 teplot\u011b.<\/li>\n\n\n\n<li>Um\u011bl\u00e9 st\u00e1rnut\u00ed: d\u00edl se zah\u0159eje na \u0159\u00edzenou teplotu, aby se reakce urychlila a stabilizovala.<\/li>\n<\/ul>\n\n\n\n<p>N\u00ed\u017ee jsou uvedena b\u011b\u017en\u00e1 okna um\u011bl\u00e9ho st\u00e1rnut\u00ed, kter\u00e1 se pou\u017e\u00edvaj\u00ed jako praktick\u00e9 v\u00fdchoz\u00ed body (kone\u010dn\u00e9 hodnoty se mus\u00ed \u0159\u00eddit specifikac\u00ed materi\u00e1lu pro va\u0161i p\u0159esnou slitinu a temperaci).<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Rodina slitin<\/th><th class=\"has-text-align-center\" data-align=\"center\">Spole\u010dn\u00e9 okno um\u011bl\u00e9ho st\u00e1rnut\u00ed<\/th><th class=\"has-text-align-center\" data-align=\"center\">K \u010demu ji lid\u00e9 pou\u017e\u00edvaj\u00ed<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Slitiny hlin\u00edku<\/td><td class=\"has-text-align-center\" data-align=\"center\">120-200 \u00b0C po dobu ~4-24 h<\/td><td class=\"has-text-align-center\" data-align=\"center\">Vysok\u00e1 pevnost p\u0159i n\u00edzk\u00e9 hmotnosti; typick\u00e9 konstruk\u010dn\u00ed d\u00edly.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">PH nerezov\u00e1 ocel<\/td><td class=\"has-text-align-center\" data-align=\"center\">480-620 \u00b0C po dobu ~1-4 h<\/td><td class=\"has-text-align-center\" data-align=\"center\">Volba stavu ovliv\u0148uje pevnost ve srovn\u00e1n\u00ed s hou\u017eevnatost\u00ed\/odolnost\u00ed proti korozi.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Slitina niklu Slitina 718<\/td><td class=\"has-text-align-center\" data-align=\"center\">~720\u00b0C\/8 h \u2192 \u0159\u00edzen\u00e9 chlazen\u00ed \u2192 ~620\u00b0C\/8 h<\/td><td class=\"has-text-align-center\" data-align=\"center\">Vysok\u00e1 odolnost proti kluzu + odolnost proti te\u010den\u00ed p\u0159i zv\u00fd\u0161en\u00e9 teplot\u011b.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Tento krok tak\u00e9 odpov\u00edd\u00e1 na dv\u011b praktick\u00e9 ot\u00e1zky: Jak prov\u00e9st zpevn\u011bn\u00ed sr\u00e1\u017een\u00edm? a Jak dlouho trv\u00e1 zpevn\u011bn\u00ed sr\u00e1\u017een\u00edm? Up\u0159\u00edmn\u00e1 odpov\u011b\u010f zn\u00ed: z\u00e1le\u017e\u00ed na slitin\u011b a c\u00edlov\u00fdch podm\u00ednk\u00e1ch. St\u00e1rnut\u00ed m\u016f\u017ee u n\u011bkter\u00fdch hlin\u00edkov\u00fdch syst\u00e9m\u016f trvat hodiny v peci p\u0159i um\u011bl\u00e9m st\u00e1rnut\u00ed nebo dny p\u0159i pokojov\u00e9 teplot\u011b p\u0159i p\u0159irozen\u00e9m st\u00e1rnut\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Jak\u00fd je rozd\u00edl mezi p\u0159irozen\u00fdm a um\u011bl\u00fdm st\u00e1rnut\u00edm?<\/h3>\n\n\n\n<p>In\u017een\u00fd\u0159i se na to ptaj\u00ed, proto\u017ee to ovliv\u0148uje \u0159\u00edzen\u00ed v\u00fdroby a pl\u00e1nov\u00e1n\u00ed.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>P\u0159irozen\u00e9 st\u00e1rnut\u00ed prob\u00edh\u00e1 p\u0159i pokojov\u00e9 teplot\u011b po ochlazen\u00ed. M\u016f\u017ee se zlep\u0161it pevnost v pr\u016fb\u011bhu hodin a\u017e dn\u016f, ale m\u016f\u017ee b\u00fdt m\u00e9n\u011b p\u0159edv\u00eddateln\u00e9, pokud se doba a teplota skladov\u00e1n\u00ed li\u0161\u00ed.<\/li>\n\n\n\n<li>Um\u011bl\u00e9 st\u00e1rnut\u00ed vyu\u017e\u00edv\u00e1 \u0159\u00edzen\u00fd cyklus pece k dosa\u017een\u00ed definovan\u00e9 teploty. Je rychlej\u0161\u00ed a konzistentn\u011bj\u0161\u00ed, co\u017e pom\u00e1h\u00e1, kdy\u017e pot\u0159ebujete opakovatelnou tvrdost po obr\u00e1b\u011bn\u00ed a p\u0159ed expedic\u00ed.<\/li>\n<\/ul>\n\n\n\n<p>Pokud pot\u0159ebujete stabiln\u00ed v\u00fdsledky v mnoha \u0161ar\u017e\u00edch, je um\u011bl\u00e9 st\u00e1rnut\u00ed obvykle snadn\u011bji kontrolovateln\u00e9.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/3-1024x768.webp\" alt=\"tepeln\u00e9 zpracov\u00e1n\u00ed sr\u00e1\u017een\u00edm\" class=\"wp-image-8695\" srcset=\"https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/3-1024x768.webp 1024w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/3-300x225.webp 300w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/3-768x576.webp 768w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/3-16x12.webp 16w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/3.webp 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Jak to funguje: Mikrostruktura, sra\u017eeniny a zp\u016fsoby zpev\u0148ov\u00e1n\u00ed<\/h2>\n\n\n\n<p>Pos\u00edlen\u00ed nen\u00ed jen \u201cproto\u017ee je vyh\u0159\u00edvan\u00e9\u201d. Je to proto, \u017ee se mikrostruktura m\u011bn\u00ed pl\u00e1novan\u00fdm zp\u016fsobem.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">V\u00fdvoj sr\u00e1\u017eek: nedostate\u010dn\u00e9 st\u00e1\u0159\u00ed \u2192 vrcholn\u00e9 st\u00e1\u0159\u00ed \u2192 p\u0159est\u00e1rl\u00e9 (hrubnut\u00ed)<\/h3>\n\n\n\n<p>B\u011bhem st\u00e1rnut\u00ed se tvo\u0159\u00ed sra\u017eeniny, kter\u00e9 v pr\u016fb\u011bhu \u010dasu m\u011bn\u00ed svou velikost. Pr\u016fb\u011bh pevnosti m\u00e1 obvykle jednoduch\u00fd tvar:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Zpo\u010d\u00e1tku s\u00edla stoup\u00e1, proto\u017ee se tvo\u0159\u00ed mnoho jemn\u00fdch \u010d\u00e1stic.<\/li>\n\n\n\n<li>Pevnost dosahuje maxima ve \u0161pi\u010dkov\u00e9m stavu.<\/li>\n\n\n\n<li>Pevnost kles\u00e1 p\u0159i nadm\u011brn\u00e9m st\u00e1rnut\u00ed, proto\u017ee \u010d\u00e1stice rostou a zv\u011bt\u0161uj\u00ed se rozestupy.<\/li>\n<\/ul>\n\n\n\n<p>To je d\u016fvod, pro\u010d jedna v\u00e1rka m\u016f\u017ee b\u00fdt perfektn\u00ed a druh\u00e1 m\u011bkk\u00e1, i kdy\u017e \u201cjsme d\u011blali tot\u00e9\u017e\u201d - mal\u00e1 chyba teploty, del\u0161\u00ed zdr\u017een\u00ed nebo pomal\u00e9 chlazen\u00ed m\u016f\u017ee strukturu posunout sm\u011brem k p\u0159\u00edli\u0161n\u00e9mu zr\u00e1n\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Koherence a velikost \u010d\u00e1stic: koherentn\u00ed vs. polokoherentn\u00ed vs. nekoherentn\u00ed<\/h3>\n\n\n\n<p>Ran\u00e9 precipit\u00e1ty \u010dasto dob\u0159e zapadaj\u00ed do matrice, co\u017e znamen\u00e1, \u017ee jsou koherentn\u00ed. Koherence vytv\u00e1\u0159\u00ed deforma\u010dn\u00ed pole, kter\u00e9 odol\u00e1v\u00e1 dislokac\u00edm. S r\u016fstem precipit\u00e1t\u016f se p\u0159izp\u016fsoben\u00ed zhor\u0161uje a st\u00e1vaj\u00ed se polokoherentn\u00edmi nebo nekoherentn\u00edmi. Tento posun m\u011bn\u00ed mechanismus zpev\u0148ov\u00e1n\u00ed a \u010dasto sni\u017euje \u0161pi\u010dkovou pevnost.<\/p>\n\n\n\n<p>U\u017eite\u010dn\u00fd ment\u00e1ln\u00ed obraz je n\u00e1sleduj\u00edc\u00ed: sr\u00e1\u017eky jsou zpo\u010d\u00e1tku jako mal\u00e9 hrbolky pod kobercem - t\u011b\u017eko se po nich klou\u017ee. Pozd\u011bji se zm\u011bn\u00ed v men\u0161\u00ed a v\u011bt\u0161\u00ed p\u0159ek\u00e1\u017eky, mezi nimi\u017e jsou v\u011bt\u0161\u00ed rozestupy. Dislokace si najdou cesti\u010dky.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Cutting vs. Orowan looping (bypassing): co se m\u011bn\u00ed p\u0159i maxim\u00e1ln\u00ed s\u00edle<\/h3>\n\n\n\n<p>P\u0159i men\u0161\u00edch rozm\u011brech mohou dislokace prot\u00ednat precipit\u00e1ty, ale stoj\u00ed to energii, proto\u017ee precipit\u00e1t se li\u0161\u00ed od matrice. P\u0159i v\u011bt\u0161\u00edch rozm\u011brech se dislokace proh\u00fdbaj\u00ed mezi \u010d\u00e1sticemi a zanech\u00e1vaj\u00ed za sebou smy\u010dky. Odpor siln\u011b z\u00e1vis\u00ed na vzd\u00e1lenosti mezi \u010d\u00e1sticemi.<\/p>\n\n\n\n<p>Proto se v mnoha syst\u00e9mech \u010dasto objevuje \u201csweet spot\u201d kolem velikosti \u010d\u00e1stic 5-30 nm. P\u0159i t\u00e9to velikosti je \u010d\u00e1stic hodn\u011b a jsou bl\u00edzko u sebe, tak\u017ee dislokace se t\u011b\u017eko pohybuj\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Typick\u00e9 f\u00e1ze precipit\u00e1tu (podle syst\u00e9mu slitin)<\/h3>\n\n\n\n<p>R\u016fzn\u00e9 rodiny tvo\u0159\u00ed r\u016fzn\u00e9 sra\u017eeniny. Pro spr\u00e1vn\u00fd chod d\u00edl\u016f si nemus\u00edte pamatovat n\u00e1zvy f\u00e1z\u00ed, ale pom\u016f\u017ee v\u00e1m v\u011bd\u011bt, \u017ee \u201cpevnostn\u00ed f\u00e1ze\u201d se li\u0161\u00ed podle slitiny, tak\u017ee se li\u0161\u00ed i cyklus.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Syst\u00e9m slitin<\/th><th class=\"has-text-align-center\" data-align=\"center\">B\u011b\u017en\u00e9 zpev\u0148uj\u00edc\u00ed sr\u00e1\u017eky (vysok\u00e1 \u00farove\u0148)<\/th><th class=\"has-text-align-center\" data-align=\"center\">Co z toho vypl\u00fdv\u00e1<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Hlin\u00edk (nap\u0159\u00edklad Al-Cu, Al-Mg-Si, Al-Zn-Mg)<\/td><td class=\"has-text-align-center\" data-align=\"center\">Ran\u00e9 z\u00f3ny (\u010dasto naz\u00fdvan\u00e9 GP z\u00f3ny) pak siln\u011bj\u0161\u00ed precipit\u00e1ty, jako je typ \u03b8\u2032 v syst\u00e9mech Al-Cu.<\/td><td class=\"has-text-align-center\" data-align=\"center\">Pevnost je citliv\u00e1 na \u010dasovou\/teplotn\u00ed historii a dokonce i na skladov\u00e1n\u00ed po ochlazen\u00ed.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Slitiny niklu (nap\u0159\u00edklad slitina 718)<\/td><td class=\"has-text-align-center\" data-align=\"center\">Sr\u00e1\u017eky typu \u03b3\u2032 \/ \u03b3\u2033<\/td><td class=\"has-text-align-center\" data-align=\"center\">Siln\u00e9 vlastnosti p\u0159i zv\u00fd\u0161en\u00fdch teplot\u00e1ch; b\u011b\u017en\u00e9 je v\u00edcestup\u0148ov\u00e9 st\u00e1rnut\u00ed.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">PH nerezov\u00e1 ocel<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u010casto precipit\u00e1ty bohat\u00e9 na Cu (v z\u00e1vislosti na stupni) a dal\u0161\u00ed jemn\u00e9 f\u00e1ze<\/td><td class=\"has-text-align-center\" data-align=\"center\">St\u00e1rnut\u00ed m\u011bn\u00ed pevnost, hou\u017eevnatost a n\u011bkdy i korozn\u00ed reakce.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Pr\u016fvodce slitinou po slitin\u011b: Parametry, vlastnosti a p\u0159\u00edpady pou\u017eit\u00ed<\/h2>\n\n\n\n<p>V t\u00e9to oblasti chce v\u011bt\u0161ina lid\u00ed rychl\u00e9 vyjasn\u011bn\u00ed: \u201cM\u00e1m tuto slitinu; jak vypad\u00e1 jej\u00ed sr\u00e1\u017ekov\u00e9 kalen\u00ed?\u201d<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Slitiny hlin\u00edku (2xxx \/ 6xxx \/ 7xxx): temperace a skoky vlastnost\u00ed<\/h3>\n\n\n\n<p>Mnoho hlin\u00edkov\u00fdch slitin pou\u017e\u00edvan\u00fdch v konstrukc\u00edch je ur\u010deno pro zpevn\u011bn\u00ed sr\u00e1\u017een\u00edm. \u010casto se setk\u00e1te s temperacemi \u201cT\u201d, kter\u00e9 popisuj\u00ed stav po tepeln\u00e9m zpracov\u00e1n\u00ed roztokem a st\u00e1rnut\u00ed (p\u0159esn\u00fd v\u00fdznam jednotliv\u00fdch k\u00f3d\u016f temperac\u00ed je definov\u00e1n v norm\u00e1ch).<\/p>\n\n\n\n<p>P\u0159i re\u00e1ln\u00e9 pr\u00e1ci je jedn\u00edm z nejv\u011bt\u0161\u00edch p\u0159ekvapen\u00ed, jak rychle se n\u011bkter\u00e9 druhy hlin\u00edku m\u011bn\u00ed hned po kalen\u00ed. Pokud odlo\u017e\u00edte um\u011bl\u00e9 st\u00e1rnut\u00ed, m\u016f\u017ee za\u010d\u00edt p\u0159irozen\u00e9 st\u00e1rnut\u00ed a zm\u011bnit kone\u010dn\u00e9 vlastnosti. To m\u00e1 v\u00fdznam, kdy\u017e po rozpu\u0161t\u011bn\u00ed prov\u00e1d\u00edte soustru\u017een\u00ed s \u00fazkou toleranc\u00ed nebo fr\u00e9zovac\u00ed operace. Vid\u011bl jsem d\u00edly, kter\u00e9 se r\u00e1no obr\u00e1b\u011bly kr\u00e1sn\u011b, ale odpoledne \u0159ezaly \u201cgumov\u011b\u201d, proto\u017ee materi\u00e1l za\u010dal st\u00e1rnout a zm\u011bnil se pocit p\u0159i \u0159ez\u00e1n\u00ed.<\/p>\n\n\n\n<p>Zde je pohled na \u00farove\u0148 rodiny s b\u011b\u017en\u00fdmi p\u0159\u00edklady a typick\u00fdmi okny. V\u017edy se \u0159i\u010fte specifikac\u00ed materi\u00e1lu p\u0159esn\u011b pro slitinu\/temper, kterou kupujete.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">P\u0159\u00edklad slitiny hlin\u00edku<\/th><th class=\"has-text-align-center\" data-align=\"center\">Typick\u00e1 teplota roztoku<\/th><th class=\"has-text-align-center\" data-align=\"center\">Typick\u00e9 um\u011bl\u00e9 st\u00e1rnut\u00ed<\/th><th class=\"has-text-align-center\" data-align=\"center\">Typick\u00fd rozsah meze kluzu (p\u0159ibli\u017en\u00fd, z\u00e1visl\u00fd na temperaci)<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Typ 2024 (rodina Al-Cu)<\/td><td class=\"has-text-align-center\" data-align=\"center\">~495-505\u00b0C<\/td><td class=\"has-text-align-center\" data-align=\"center\">~190 \u00b0C po dobu ~8-12 h (li\u0161\u00ed se podle temperace\/procesu)<\/td><td class=\"has-text-align-center\" data-align=\"center\">~300-450+ MPa<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Typ 6061 (rodina Al-Mg-Si)<\/td><td class=\"has-text-align-center\" data-align=\"center\">~530-540\u00b0C<\/td><td class=\"has-text-align-center\" data-align=\"center\">~160-180 \u00b0C po dobu ~6-18 h<\/td><td class=\"has-text-align-center\" data-align=\"center\">~240-320 MPa<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Typ 7075 (skupina Al-Zn-Mg-Cu)<\/td><td class=\"has-text-align-center\" data-align=\"center\">~470-490\u00b0C<\/td><td class=\"has-text-align-center\" data-align=\"center\">~120-130 \u00b0C po dobu ~18-30 h (nebo v\u00edce krok\u016f pro podm\u00ednky nadm\u011brn\u00e9ho st\u00e1rnut\u00ed)<\/td><td class=\"has-text-align-center\" data-align=\"center\">~450-550+ MPa<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Co je to sr\u00e1\u017ekov\u00e9 kalen\u00ed hlin\u00edku? Jedn\u00e1 se o cyklus rozpu\u0161t\u011bn\u00ed, kalen\u00ed a st\u00e1rnut\u00ed, kter\u00fd se aplikuje na hlin\u00edkov\u00e9 slitiny podl\u00e9haj\u00edc\u00ed st\u00e1rnut\u00ed za vzniku jemn\u00fdch precipit\u00e1t\u016f, kter\u00e9 zvy\u0161uj\u00ed v\u00fdt\u011b\u017enost a tvrdost. P\u0159i spr\u00e1vn\u00e9m proveden\u00ed poskytuje vysokou pevnost v pom\u011bru k hmotnosti. P\u0159i \u0161patn\u00e9m proveden\u00ed vznikaj\u00ed m\u011bkk\u00e9 d\u00edly nebo probl\u00e9my s koroz\u00ed pod nap\u011bt\u00edm.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Sr\u00e1\u017een\u00edm vytvrzovan\u00e9 nerezov\u00e9 oceli (typ 17-4 PH, 15-5 PH, 13-8)<\/h3>\n\n\n\n<p>PH nerezov\u00e9 oceli jsou obl\u00edben\u00e9, proto\u017ee mohou dosahovat vysok\u00e9 pevnosti p\u0159i zachov\u00e1n\u00ed u\u017eite\u010dn\u00e9 odolnosti proti korozi. Nejsou stejn\u00e9 jako martenzitick\u00e9 nerezov\u00e9 oceli, kter\u00e9 se spol\u00e9haj\u00ed p\u0159edev\u0161\u00edm na pevnost p\u0159i kalen\u00ed a temperaci. PH korozivzdorn\u00e9 oceli vyu\u017e\u00edvaj\u00ed ke kone\u010dn\u00e9mu zpevn\u011bn\u00ed po \u00faprav\u011b roztokem sr\u00e1\u017een\u00ed.<\/p>\n\n\n\n<p>Velk\u00fdm ka\u017edodenn\u00edm rozhodnut\u00edm je, jak\u00fd stav st\u00e1rnut\u00ed zvolit. Nap\u0159\u00edklad jedna z b\u011b\u017en\u00fdch t\u0159\u00edd nab\u00edz\u00ed podm\u00ednky, kter\u00e9 se \u010dasto ozna\u010duj\u00ed podle teploty st\u00e1rnut\u00ed (st\u00e1rnut\u00ed s vy\u0161\u0161\u00ed pevnost\u00ed p\u0159i ni\u017e\u0161\u00ed teplot\u011b versus st\u00e1rnut\u00ed s vy\u0161\u0161\u00ed pevnost\u00ed p\u0159i vy\u0161\u0161\u00ed teplot\u011b). Lid\u00e9 se n\u011bkdy hon\u00ed za maxim\u00e1ln\u00ed tvrdost\u00ed, a pak zjist\u00ed, \u017ee nejtvrd\u0161\u00ed volba pro provoz nen\u00ed v\u017edy tou nejtvrd\u0161\u00ed volbou.<\/p>\n\n\n\n<p>Zde je uveden zjednodu\u0161en\u00fd styl porovn\u00e1v\u00e1n\u00ed, kter\u00fd odpov\u00edd\u00e1 tomu, jak in\u017een\u00fd\u0159i skute\u010dn\u011b vyb\u00edraj\u00ed. P\u0159esn\u00e1 \u010d\u00edsla se li\u0161\u00ed podle formy a specifikace v\u00fdrobku, ale trend je spolehliv\u00fd.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">PH nerezov\u00fd stav styl<\/th><th class=\"has-text-align-center\" data-align=\"center\">Teplotn\u00ed rozsah st\u00e1rnut\u00ed<\/th><th class=\"has-text-align-center\" data-align=\"center\">Trend s\u00edly<\/th><th class=\"has-text-align-center\" data-align=\"center\">Trend odolnosti\/korozivnosti<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Stav s vy\u0161\u0161\u00ed pevnost\u00ed (ni\u017e\u0161\u00ed teplota st\u00e1rnut\u00ed)<\/td><td class=\"has-text-align-center\" data-align=\"center\">~480-510\u00b0C<\/td><td class=\"has-text-align-center\" data-align=\"center\">Vy\u0161\u0161\u00ed v\u00fdt\u011b\u017enost a tvrdost (\u010dasto dosahuje ~HRC 40+)<\/td><td class=\"has-text-align-center\" data-align=\"center\">Hou\u017eevnatost m\u016f\u017ee klesnout, citlivost SCC se m\u016f\u017ee v n\u011bkter\u00fdch prost\u0159ed\u00edch zv\u00fd\u0161it.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">T\u011b\u017e\u0161\u00ed podm\u00ednky (vy\u0161\u0161\u00ed teplota st\u00e1rnut\u00ed)<\/td><td class=\"has-text-align-center\" data-align=\"center\">~590-620\u00b0C<\/td><td class=\"has-text-align-center\" data-align=\"center\">Ni\u017e\u0161\u00ed v\u00fdt\u011b\u017enost ne\u017e \u0161pi\u010dkov\u00e1<\/td><td class=\"has-text-align-center\" data-align=\"center\">Hou\u017eevnatost se \u010dasto zlep\u0161uje; riziko SCC se m\u016f\u017ee sn\u00ed\u017eit<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>To p\u0159\u00edmo souvis\u00ed s \u00fa\u010delem sr\u00e1\u017eec\u00edho kalen\u00ed v nerezov\u00e9 oceli: vlastnosti m\u016f\u017eete vyladit teplotou a \u010dasem st\u00e1rnut\u00ed, ne jen \u201cztvrdnout\u201d.\u201d<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Superslitiny na b\u00e1zi niklu (referen\u010dn\u00ed slitina 718)<\/h3>\n\n\n\n<p>Slitiny niklu pou\u017e\u00edvan\u00e9 v hork\u00fdch profilech \u010dasto vy\u017eaduj\u00ed pevnost, kter\u00e1 vydr\u017e\u00ed p\u0159i teplot\u011b. V t\u011bchto slitin\u00e1ch pom\u00e1haj\u00ed precipit\u00e1ty jako \u03b3\u2032 a \u03b3\u2033 odol\u00e1vat creepu (pomal\u00e9 deformaci p\u0159i zat\u00ed\u017een\u00ed) mnohem l\u00e9pe ne\u017e mnoh\u00e9 jin\u00e9 skupiny slitin.<\/p>\n\n\n\n<p>B\u011b\u017en\u011b pou\u017e\u00edvan\u00fd cyklus pro slitinu 718 vyu\u017e\u00edv\u00e1 dvoustup\u0148ov\u00e9 st\u00e1rnut\u00ed, nap\u0159\u00edklad udr\u017eov\u00e1n\u00ed teploty kolem 720 \u00b0C, pot\u00e9 \u0159\u00edzen\u00e9 ochlazen\u00ed a op\u011btovn\u00e9 udr\u017eov\u00e1n\u00ed teploty kolem 620 \u00b0C. Tento \u0159\u00edzen\u00fd postup vytv\u00e1\u0159\u00ed spr\u00e1vnou velikost a rozlo\u017een\u00ed sra\u017eenin. Nejde jen o dvoj\u00ed zah\u0159\u00e1t\u00ed. Jde o \u0159\u00edzen\u00ed nukleace a r\u016fstu, aby slitina z\u016fstala pevn\u00e1 i za tepla.<\/p>\n\n\n\n<p>Pokud v\u00e1s n\u011bkdy zaj\u00edmalo, pro\u010d obchod trv\u00e1 na zaznamen\u00e1v\u00e1n\u00ed rychlosti n\u00e1b\u011bhu a rychlosti ochlazov\u00e1n\u00ed t\u011bchto slitin, pak pr\u00e1v\u011b proto: mal\u00e9 zm\u011bny mohou zm\u011bnit velikost sra\u017eeniny, a to m\u011bn\u00ed pevnost a \u017eivotnost.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">M\u011b\u010f a titan (v p\u0159\u00edpad\u011b, \u017ee doch\u00e1z\u00ed ke zpevn\u011bn\u00ed v\u011bkem)<\/h3>\n\n\n\n<p>Kalen\u00ed st\u00e1\u0159\u00edm se net\u00fdk\u00e1 pouze hlin\u00edku a nerezu.<\/p>\n\n\n\n<p>N\u011bkter\u00e9 slitiny m\u011bdi se kal\u00ed st\u00e1rnut\u00edm, aby se dos\u00e1hlo u\u017eite\u010dn\u00e9 kombinace pevnosti, \u00fanavov\u00e9 odolnosti a elektrick\u00e9 nebo tepeln\u00e9 vodivosti. Ty jsou b\u011b\u017en\u00e9 tam, kde pot\u0159ebujete pru\u017e\u00edc\u00ed s\u00edlu a z\u00e1rove\u0148 dobrou vodivost.<\/p>\n\n\n\n<p>U n\u011bkter\u00fdch slitin titanu se ke zv\u00fd\u0161en\u00ed pevnosti pou\u017e\u00edv\u00e1 tak\u00e9 \u00faprava roztokem a st\u00e1rnut\u00ed. Podrobnosti se li\u0161\u00ed podle typu slitiny, ale my\u0161lenka je podobn\u00e1: vytvo\u0159it v matrici jemn\u00e9 precipit\u00e1ty, kter\u00e9 blokuj\u00ed dislokace. Zpracov\u00e1n\u00ed titanu je \u010dasto citliv\u00e9 na kontaminaci a kontrolu atmosf\u00e9ry, tak\u017ee obchody dodr\u017euj\u00ed p\u0159\u00edsn\u00e9 postupy.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/4-1024x768.webp\" alt=\"sr\u00e1\u017ekov\u011b kalen\u00fd hlin\u00edk\" class=\"wp-image-8696\" srcset=\"https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/4-1024x768.webp 1024w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/4-300x225.webp 300w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/4-768x576.webp 768w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/4-16x12.webp 16w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/4.webp 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Majetkov\u00e9 kompromisy: Pevnost vs. hou\u017eevnatost, koroze a teplota.<\/h2>\n\n\n\n<p>Kdyby bylo sr\u00e1\u017eec\u00ed kalen\u00ed \u201cvolnou pevnost\u00ed\u201d, pou\u017e\u00edvala by ji ka\u017ed\u00e1 slitina stejn\u011b. Skute\u010dnost je vyv\u00e1\u017een\u011bj\u0161\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Z\u00e1m\u011brn\u00e9 nadm\u011brn\u00e9 st\u00e1rnut\u00ed: kdy\u017e je ni\u017e\u0161\u00ed pevnost bezpe\u010dn\u011bj\u0161\u00ed (tv\u00e1rnost\/hou\u017eevnatost).<\/h3>\n\n\n\n<p>Nadm\u011brn\u00e9 st\u00e1rnut\u00ed zn\u00ed jako chyba, ale n\u011bkdy je to volba designu. Pro\u010d byste m\u011bli akceptovat men\u0161\u00ed pevnost?<\/p>\n\n\n\n<p>Proto\u017ee m\u00edrn\u011b hrub\u0161\u00ed struktura sra\u017eeniny m\u016f\u017ee zv\u00fd\u0161it ta\u017enost a lomovou hou\u017eevnatost. U n\u011bkter\u00fdch PH korozivzdorn\u00fdch ocel\u00ed sni\u017euje st\u00e1\u0159\u00ed p\u0159i vy\u0161\u0161\u00ed teplot\u011b \u0161pi\u010dkovou pevnost, ale m\u016f\u017ee zlep\u0161it hou\u017eevnatost a odolnost proti korozi. U n\u011bkter\u00fdch vysokopevnostn\u00edch hlin\u00edkov\u00fdch slitin se vol\u00ed vy\u0161\u0161\u00ed teploty st\u00e1\u0159\u00ed, aby se sn\u00ed\u017eilo riziko vzniku korozn\u00edho prask\u00e1n\u00ed pod nap\u011bt\u00edm (SCC).<\/p>\n\n\n\n<p>Pokud se tedy jedn\u00e1 o kritickou armaturu, tlakovou sou\u010d\u00e1stku nebo cokoli, co je vystaveno drsn\u00e9mu prost\u0159ed\u00ed, nemus\u00ed b\u00fdt nejbezpe\u010dn\u011bj\u0161\u00ed volbou ta nejpevn\u011bj\u0161\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">D\u016fsledky koroze pod nap\u011bt\u00edm (SCC) a odolnosti proti korozi<\/h3>\n\n\n\n<p>Riziko SCC z\u00e1vis\u00ed na skupin\u011b slitin, temperaci, prost\u0159ed\u00ed, \u00farovni nam\u00e1h\u00e1n\u00ed a stavu povrchu. Spole\u010dn\u00fdm znakem je, \u017ee podm\u00ednky \u0161pi\u010dkov\u00e9ho st\u00e1rnut\u00ed a vysok\u00e9 pevnosti mohou b\u00fdt v agresivn\u00edm prost\u0159ed\u00ed zraniteln\u011bj\u0161\u00ed.<\/p>\n\n\n\n<p>To neznamen\u00e1 \u201cvyhnout se ztvrdnut\u00ed sr\u00e1\u017eek\u201d. Znamen\u00e1 to p\u0159izp\u016fsobit temperaci prost\u0159ed\u00ed. Pokud se d\u00edl nach\u00e1z\u00ed v bl\u00edzkosti slan\u00e9 vody, setk\u00e1v\u00e1 se s \u010distic\u00edmi chemik\u00e1liemi nebo je trvale nam\u00e1h\u00e1n v tahu, m\u011bli byste SCC pova\u017eovat za sou\u010d\u00e1st n\u00e1vrhu, nikoliv za dodate\u010dn\u00fd po\u017eadavek.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u00danavov\u00e9 vlastnosti: precipit\u00e1ty, zbytkov\u00e9 nap\u011bt\u00ed, stav povrchu<\/h3>\n\n\n\n<p>\u00danavov\u00e1 \u017eivotnost z\u00e1vis\u00ed na mikrostruktu\u0159e, ale tak\u00e9 na povrchu. I kr\u00e1sn\u011b zest\u00e1rl\u00e1 mikrostruktura m\u016f\u017ee p\u0159ed\u010dasn\u011b selhat, pokud m\u00e1 povrch trhliny po obr\u00e1b\u011bn\u00ed, ostr\u00e9 z\u00e1\u0159ezy nebo tahov\u00e1 zbytkov\u00e1 nap\u011bt\u00ed po siln\u00e9m kalen\u00ed.<\/p>\n\n\n\n<p>Zde z\u00e1le\u017e\u00ed na sekvenci. Mnoho t\u00fdm\u016f prov\u00e1d\u00ed hrub\u00e9 obr\u00e1b\u011bn\u00ed, pak tepeln\u00e9 zpracov\u00e1n\u00ed a nakonec dokon\u010dovac\u00ed obr\u00e1b\u011bn\u00ed nebo povrchovou \u00fapravu. Jin\u00e9 nejprve provedou \u00fapln\u00e9 obr\u00e1b\u011bn\u00ed a b\u011bhem tepeln\u00e9ho zpracov\u00e1n\u00ed p\u0159ipust\u00ed ur\u010dit\u00fd pohyb. Neexistuje jedin\u00e9 pravidlo - rozhoduje geometrie a tolerance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Teplotn\u00ed stabilita: stropy provozn\u00ed teploty a riziko zhrubnut\u00ed<\/h3>\n\n\n\n<p>Sr\u00e1\u017een\u00edm vytvrzen\u00e9 slitiny mohou ztratit pevnost, pokud jsou vystaveny teplot\u00e1m, p\u0159i nich\u017e doch\u00e1z\u00ed ke zhrubnut\u00ed nebo rozpu\u0161t\u011bn\u00ed sra\u017eenin.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mnoho sr\u00e1\u017een\u00edm vytvrzen\u00fdch hlin\u00edkov\u00fdch slitin m\u016f\u017ee p\u0159i dlouhodob\u00e9m p\u016fsoben\u00ed teploty kolem ~200-250 \u00b0C (p\u0159esn\u00e1 teplota z\u00e1vis\u00ed na slitin\u011b a temperaci) ztr\u00e1cet pevnost.<\/li>\n\n\n\n<li>Slitiny zpevn\u011bn\u00e9 sr\u00e1\u017een\u00edm niklu si mohou udr\u017eet pevnost a\u017e do vy\u0161\u0161\u00edch teplot, proto\u017ee jejich precipit\u00e1ty jsou v hork\u00e9m provozu stabiln\u011bj\u0161\u00ed.<\/li>\n<\/ul>\n\n\n\n<p>Pokud bude v\u00e1\u0161 d\u00edl pracovat za tepla, zeptejte se v\u010das: bude se b\u011bhem provozu nach\u00e1zet v bl\u00edzkosti teploty st\u00e1rnut\u00ed? Pokud ano, m\u016f\u017ee se st\u00e1t, \u017ee se va\u0161e pe\u010dliv\u011b zvolen\u00e9 temperov\u00e1n\u00ed posune.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u0158\u00edzen\u00ed proces\u016f, kontrola kvality a osv\u011bd\u010den\u00e9 postupy v d\u00edln\u011b<\/h2>\n\n\n\n<p>O\u0161et\u0159en\u00ed sr\u00e1\u017ekov\u00fdm vytvrzov\u00e1n\u00edm vypad\u00e1 na pap\u00ed\u0159e jednodu\u0161e. V re\u00e1ln\u00e9 peci s re\u00e1ln\u00fdm zat\u00ed\u017een\u00edm je snadn\u00e9 p\u0159ij\u00edt o \u0161pi\u010dkov\u00e9 vlastnosti.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u0158\u00edzen\u00ed pece\/trouby: rovnom\u011brnost, rychlost n\u00e1b\u011bhu a p\u0159\u00edsn\u00e9 tolerance<\/h3>\n\n\n\n<p>Mnoho cykl\u016f st\u00e1rnut\u00ed je natolik citliv\u00fdch, \u017ee praktick\u00e1 regulace \u010dasto vy\u017eaduje p\u0159ibli\u017en\u011b \u00b15-10 \u00b0C, aby se spolehliv\u011b dos\u00e1hlo c\u00edlov\u00e9ho stavu. Rovnom\u011brnost teploty je d\u016fle\u017eit\u00e1, proto\u017ee jeden roh z\u00e1t\u011b\u017ee, kter\u00fd je o 15 \u00b0C teplej\u0161\u00ed, m\u016f\u017ee p\u0159est\u00e1rnout, zat\u00edmco zbytek je perfektn\u00ed.<\/p>\n\n\n\n<p>Velikost z\u00e1t\u011b\u017ee, vzd\u00e1lenost d\u00edl\u016f a proud\u011bn\u00ed vzduchu mohou zp\u016fsobit tepeln\u00e9 zpo\u017ed\u011bn\u00ed. Tlust\u00fd d\u00edl nemus\u00ed dos\u00e1hnout teploty nas\u00e1t\u00ed tak rychle jako tenk\u00fd, i kdy\u017e displej pece ukazuje \u201cp\u0159i teplot\u011b\u201d.\u201d<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Normy a sledovatelnost: co propojit a co dokumentovat<\/h3>\n\n\n\n<p>V kontrolovan\u00fdch pr\u016fmyslov\u00fdch odv\u011btv\u00edch obvykle pot\u0159ebujete d\u016fkaz, \u017ee tepeln\u00e9 zpracov\u00e1n\u00ed splnilo po\u017eadovan\u00fd cyklus. I v b\u011b\u017en\u00e9m pr\u016fmyslu pom\u00e1h\u00e1 dokumentace v p\u0159\u00edpad\u011b ne\u00fasp\u011b\u0161n\u00e9ho auditu tvrdosti.<\/p>\n\n\n\n<p>Typick\u00e9 z\u00e1znamy zahrnuj\u00ed grafy pec\u00ed, mapy zat\u00ed\u017een\u00ed, kontroly kalic\u00edho m\u00e9dia a sledovatelnost d\u00edl\u016f podle tepla\/party. Pokud jste n\u011bkdy museli dodate\u010dn\u011b t\u0159\u00eddit d\u00edly se sm\u00ed\u0161enou \u0161ar\u017e\u00ed, v\u00edte, pro\u010d je tato dokumentace d\u016fle\u017eit\u00e1.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Zkou\u0161en\u00ed a ov\u011b\u0159ov\u00e1n\u00ed: tvrdost, tah, potvrzen\u00ed mikrostruktury<\/h3>\n\n\n\n<p>Zkou\u0161ka tvrdosti je rychl\u00e1 a \u010dasto vhodn\u00e1 pro kontrolu procesu, ale samotn\u00e1 tvrdost v\u017edy nesta\u010d\u00ed. N\u011bkter\u00e9 specifikace vy\u017eaduj\u00ed tahov\u00e9 kupony nebo periodick\u00e9 tahov\u00e9 zkou\u0161ky, proto\u017ee na kluzu a prodlou\u017een\u00ed z\u00e1le\u017e\u00ed stejn\u011b jako na tvrdosti.<\/p>\n\n\n\n<p>V p\u0159\u00edpad\u011b vy\u0161et\u0159ov\u00e1n\u00ed poruchy m\u016f\u017ee kontrola mikrostruktury potvrdit, zda byly d\u00edly nedostate\u010dn\u011b, \u0161pi\u010dkov\u011b nebo nadm\u011brn\u011b zest\u00e1rl\u00e9, a to na z\u00e1klad\u011b rozlo\u017een\u00ed precipit\u00e1t\u016f (\u010dasto nep\u0159\u00edmo, proto\u017ee mnoho precipit\u00e1t\u016f je pro z\u00e1kladn\u00ed mikroskopy p\u0159\u00edli\u0161 jemn\u00fdch).<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/5-1024x768.webp\" alt=\"co je sr\u00e1\u017ekov\u00e9 vytvrzov\u00e1n\u00ed\" class=\"wp-image-8697\" srcset=\"https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/5-1024x768.webp 1024w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/5-300x225.webp 300w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/5-768x576.webp 768w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/5-16x12.webp 16w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/5.webp 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Jak ov\u011b\u0159\u00edte, \u017ee je d\u00edl spr\u00e1vn\u011b vytvrzen sr\u00e1\u017een\u00edm?<\/h3>\n\n\n\n<p>Ov\u011b\u0159ujete jej porovn\u00e1n\u00edm test\u016f a z\u00e1znam\u016f s po\u017eadavkem, obvykle pomoc\u00ed:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Kontrola tvrdosti (u v\u011bt\u0161\u00edch d\u00edl\u016f \u010dasto na v\u00edce m\u00edstech)<\/li>\n\n\n\n<li>Zkou\u0161ky tahu na kuponech, pokud jsou vy\u017eadov\u00e1ny<\/li>\n\n\n\n<li>\u010casov\u00e9 a teplotn\u00ed z\u00e1znamy pece pro \u0161ar\u017ei<\/li>\n\n\n\n<li>Sledovatelnost materi\u00e1lu a \u0161ar\u017ee, abyste v\u011bd\u011bli, \u017ee stav slitiny byl p\u0159ed zpracov\u00e1n\u00edm spr\u00e1vn\u00fd.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">B\u011b\u017en\u00e9 probl\u00e9my a jejich \u0159e\u0161en\u00ed (zkreslen\u00ed, m\u011bkk\u00e9 d\u00edly, p\u0159epracov\u00e1n\u00ed)<\/h2>\n\n\n\n<p>S t\u011bmito probl\u00e9my se pot\u00fdkaj\u00ed i zku\u0161en\u00e9 prodejny. Dobrou zpr\u00e1vou je, \u017ee v\u011bt\u0161ina probl\u00e9m\u016f m\u00e1 dohledatelnou p\u0159\u00ed\u010dinu.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Deformace a prask\u00e1n\u00ed p\u0159i kalen\u00ed: p\u0159\u00ed\u010diny + prevence<\/h3>\n\n\n\n<p>Deformace obvykle vznik\u00e1 nerovnom\u011brn\u00fdm chlazen\u00edm a zbytkov\u00fdm nap\u011bt\u00edm. Trhliny p\u0159i ochlazen\u00ed jsou extr\u00e9mn\u00edm p\u0159\u00edpadem, kdy nap\u011bt\u00ed p\u0159evy\u0161uje schopnost materi\u00e1lu se deformovat.<\/p>\n\n\n\n<p>Mezi b\u011b\u017en\u00e9 rizikov\u00e9 faktory pat\u0159\u00ed ostr\u00e9 vnit\u0159n\u00ed rohy, velk\u00e9 zm\u011bny tlou\u0161\u0165ky, tenk\u00e9 p\u00e1sy a asymetrick\u00e9 tvary. Pokud m\u016f\u017eete p\u0159echody vyhladit nebo p\u0159idat obr\u00e1b\u011bc\u00ed materi\u00e1l, abyste pozd\u011bji odstranili deformace, \u010dasto byste to m\u011bli ud\u011blat.<\/p>\n\n\n\n<p>Sou\u010d\u00e1st\u00ed odpov\u011bdi je tak\u00e9 v\u00fdb\u011br p\u0159\u00edsnosti ha\u0161en\u00ed. U n\u011bkter\u00fdch slitin m\u016f\u017ee b\u00fdt pro zlep\u0161en\u00ed vlastnost\u00ed nutn\u00e9 kalen\u00ed vodou, u jin\u00fdch m\u016f\u017ee deformace sn\u00ed\u017eit chlazen\u00ed polymerem nebo vzduchem - pokud to specifikace umo\u017e\u0148uje.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">M\u011bkk\u00e9 \u010d\u00e1sti (nedostate\u010dn\u011b vyzr\u00e1l\u00e9) vs. p\u0159est\u00e1rl\u00e9 \u010d\u00e1sti: p\u0159\u00edznaky a hlavn\u00ed p\u0159\u00ed\u010diny<\/h3>\n\n\n\n<p>M\u011bkk\u00e9 \u010d\u00e1sti se mohou vyskytovat v\u00edce ne\u017e jedn\u00edm zp\u016fsobem:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Nedostate\u010dn\u00e9 zr\u00e1n\u00ed: p\u0159\u00edli\u0161 kr\u00e1tk\u00e1 doba zr\u00e1n\u00ed, p\u0159\u00edli\u0161 n\u00edzk\u00e1 teplota zr\u00e1n\u00ed, d\u00edly nebyly zcela namo\u010den\u00e9 nebo se d\u00edly p\u0159ed ukon\u010den\u00edm zr\u00e1n\u00ed p\u0159\u00edli\u0161 rychle ochladily.<\/li>\n\n\n\n<li>Nadm\u011brn\u00e9 st\u00e1rnut\u00ed: p\u0159\u00edli\u0161 dlouh\u00e1 doba st\u00e1rnut\u00ed, p\u0159\u00edli\u0161 vysok\u00e1 teplota, hork\u00e1 m\u00edsta v peci nebo pozd\u011bj\u0161\u00ed ne\u00famysln\u00e9 vystaven\u00ed d\u00edlu teplu (nap\u0159\u00edklad vypalov\u00e1n\u00ed barvy p\u0159i vysok\u00e9 teplot\u011b).<\/li>\n<\/ul>\n\n\n\n<p>Praktick\u00fdm vod\u00edtkem pro obchod je d\u016fslednost. Pokud je m\u011bkk\u00fd pouze st\u0159ed hust\u00e9 z\u00e1t\u011b\u017ee, m\u016f\u017ee se jednat o tepeln\u00e9 zpo\u017ed\u011bn\u00ed. Pokud jsou m\u011bkk\u00e9 okraje, m\u016f\u017ee se jednat o teplotn\u00ed p\u0159eh\u0159\u00e1t\u00ed nebo vzorce proud\u011bn\u00ed vzduchu.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Lze op\u011btovn\u011b tepeln\u011b o\u0161et\u0159it? limity op\u011btovn\u00e9ho rozpou\u0161t\u011bn\u00ed a st\u00e1rnut\u00ed<\/h3>\n\n\n\n<p>\u010casto lze materi\u00e1l znovu tepeln\u011b zpracovat op\u011btovn\u00fdm rozpou\u0161t\u011bn\u00edm a st\u00e1rnut\u00edm, ale z\u00e1le\u017e\u00ed na slitin\u011b, specifikaci a po\u010dtu cykl\u016f, kter\u00e9 ji\u017e materi\u00e1l prod\u011blal. P\u0159epracov\u00e1n\u00ed m\u016f\u017ee zm\u011bnit velikost zrn, stav povrchu a korozn\u00ed odezvu. N\u011bkter\u00e9 d\u00edly tak\u00e9 poka\u017ed\u00e9 z\u00edskaj\u00ed deformace.<\/p>\n\n\n\n<p>Nejlep\u0161\u00ed strategi\u00ed je tedy st\u00e1le prevence: spr\u00e1vn\u00fd stav slitiny, spr\u00e1vn\u00e1 kontrola cyklu, spr\u00e1vn\u00fd pl\u00e1n kalen\u00ed a opatrn\u00e9 zach\u00e1zen\u00ed po tepeln\u00e9m zpracov\u00e1n\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Co zp\u016fsobuje st\u00e1rnut\u00ed a jak mu p\u0159edch\u00e1zet?<\/h3>\n\n\n\n<p>Nadm\u011brn\u00e9 st\u00e1rnut\u00ed je obvykle zp\u016fsobeno nadm\u011brnou dobou st\u00e1rnut\u00ed p\u0159i teplot\u011b, vy\u0161\u0161\u00ed ne\u017e pl\u00e1novanou teplotou nebo necht\u011bn\u00fdm vystaven\u00edm teplu po st\u00e1rnut\u00ed. P\u0159edejdete mu p\u0159\u00edsnou kalibrac\u00ed pece, kontrolovan\u00fdm \u010dasov\u00e1n\u00edm nam\u00e1\u010den\u00ed, dobr\u00fdm rozlo\u017een\u00edm z\u00e1t\u011b\u017ee pro rovnom\u011brn\u00fd oh\u0159ev a vyhnut\u00edm se dal\u0161\u00edm tepeln\u00fdm krok\u016fm, kter\u00e9 se nach\u00e1zej\u00ed v bl\u00edzkosti rozsahu st\u00e1rnut\u00ed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pr\u016fvodce v\u00fdb\u011brem a aplikace<\/h2>\n\n\n\n<p>Mechanismy zpev\u0148ov\u00e1n\u00ed mohou na prvn\u00ed pohled vypadat zam\u011bniteln\u011b, ale jsou zalo\u017eeny na r\u016fzn\u00fdch fyzik\u00e1ln\u00edch principech a vyhovuj\u00ed r\u016fzn\u00fdm slitin\u00e1m a podm\u00ednk\u00e1m d\u00edl\u016f. Tato \u010d\u00e1st mapuje sr\u00e1\u017eec\u00ed kalen\u00ed, pracovn\u00ed kalen\u00ed a kalen\u00ed a zpev\u0148ov\u00e1n\u00ed na skute\u010dn\u00e9 p\u0159\u00edpady pou\u017eit\u00ed, ide\u00e1ln\u00ed rodiny slitin a kompromisy, kter\u00e9 maj\u00ed v\u00fdznam ve v\u00fdrob\u011b. C\u00edlem je poskytnout p\u0159ehledn\u00e9ho pr\u016fvodce v\u00fdb\u011brem s praktick\u00fdmi poznatky, nikoliv pouze metalurgickou teorii.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Kdy zvolit sr\u00e1\u017ekov\u00e9 kalen\u00ed vs. kalen\u00ed vs. kalen\u00ed a temperov\u00e1n\u00ed?<\/h3>\n\n\n\n<p>Lid\u00e9 si je pletou, proto je zde \u010dist\u00e9 rozd\u011blen\u00ed.<\/p>\n\n\n\n<p>Sr\u00e1\u017ekov\u00e9 kalen\u00ed vyu\u017e\u00edv\u00e1 jemn\u00fdch precipit\u00e1t\u016f vznikaj\u00edc\u00edch b\u011bhem st\u00e1rnut\u00ed k blokov\u00e1n\u00ed dislokac\u00ed. <a href=\"https:\/\/nvlpubs.nist.gov\/nistpubs\/sp958-lide\/014-015.pdf\">NIST<\/a>, tyto jemn\u011b rozpt\u00fdlen\u00e9 precipit\u00e1ty br\u00e1n\u00ed pohybu dislokac\u00ed a zvy\u0161uj\u00ed pevnost. B\u011b\u017en\u011b se vyskytuj\u00ed v hlin\u00edku, PH nerezov\u00fdch slitin\u00e1ch, slitin\u00e1ch niklu a v n\u011bkter\u00fdch syst\u00e9mech m\u011bdi a titanu.<\/p>\n\n\n\n<p>Zpev\u0148ov\u00e1n\u00ed obr\u00e1b\u011bn\u00edm zvy\u0161uje pevnost deformac\u00ed kovu (v\u00e1lcov\u00e1n\u00ed, ta\u017een\u00ed za studena, tv\u00e1\u0159en\u00ed). Zvy\u0161uje hustotu dislokac\u00ed nam\u00edsto p\u0159id\u00e1v\u00e1n\u00ed precipit\u00e1t\u016f. Na z\u00e1klad\u011b <a href=\"https:\/\/en.wikipedia.org\/wiki\/Work_hardening\">literatura z oblasti materi\u00e1lov\u00fdch v\u011bd<\/a>, hromad\u011bn\u00ed a propl\u00e9t\u00e1n\u00ed dislokac\u00ed zt\u011b\u017euje dal\u0161\u00ed deformaci. Je u\u017eite\u010dn\u00e1 v p\u0159\u00edpadech, kdy slitina nen\u00ed kaliteln\u00e1 st\u00e1\u0159\u00edm nebo kdy by tepeln\u00e9 zpracov\u00e1n\u00ed deformovalo hotov\u00fd d\u00edl.<\/p>\n\n\n\n<p>Kalen\u00edm a popou\u0161t\u011bn\u00edm (b\u011b\u017en\u00e9 u mnoha druh\u016f ocel\u00ed, v\u010detn\u011b uhl\u00edkov\u00fdch) se z austenitu (martenzitu) rychl\u00fdm ochlazen\u00edm vytvo\u0159\u00ed tvrd\u00e1 f\u00e1ze, kter\u00e1 se n\u00e1sledn\u011b popou\u0161t\u00ed, aby se obnovila jej\u00ed hou\u017eevnatost. Tento postup se li\u0161\u00ed od precipita\u010dn\u00edho zpev\u0148ov\u00e1n\u00ed a je b\u011b\u017en\u00fd u mnoha ocel\u00ed, kter\u00e9 nejsou ur\u010deny pro kalen\u00ed v\u011bkem.<\/p>\n\n\n\n<p>Zde je p\u0159\u00edm\u00e9 srovn\u00e1n\u00ed, kde pom\u016f\u017ee tabulka.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Metoda<\/th><th class=\"has-text-align-center\" data-align=\"center\">Hlavn\u00ed posilovac\u00ed mechanismus<\/th><th class=\"has-text-align-center\" data-align=\"center\">Typick\u00e9 materi\u00e1ly<\/th><th class=\"has-text-align-center\" data-align=\"center\">Kl\u00ed\u010dov\u00e1 v\u00fdhoda<\/th><th class=\"has-text-align-center\" data-align=\"center\">Kl\u00ed\u010dov\u00fd limit<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Zpevn\u011bn\u00ed sr\u00e1\u017eek<\/td><td class=\"has-text-align-center\" data-align=\"center\">Jemn\u00e9 precipit\u00e1ty blokuj\u00ed dislokace<\/td><td class=\"has-text-align-center\" data-align=\"center\">Slitiny Al, PH nerez, slitiny Ni, n\u011bkter\u00e9 slitiny Cu\/Ti<\/td><td class=\"has-text-align-center\" data-align=\"center\">Velk\u00fd n\u00e1r\u016fst s\u00edly p\u0159i mal\u00e9 zm\u011bn\u011b tvaru<\/td><td class=\"has-text-align-center\" data-align=\"center\">Citliv\u00fd na \u010das\/teplotu; m\u016f\u017ee ovlivnit hou\u017eevnatost\/SCC<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Zpevn\u011bn\u00ed pr\u00e1ce<\/td><td class=\"has-text-align-center\" data-align=\"center\">Plastick\u00e1 deformace zvy\u0161uje hustotu dislokac\u00ed<\/td><td class=\"has-text-align-center\" data-align=\"center\">Mnoho tv\u00e1rn\u00fdch kov\u016f<\/td><td class=\"has-text-align-center\" data-align=\"center\">Nen\u00ed pot\u0159eba \u017e\u00e1dn\u00e1 pec, je mo\u017en\u00e9 m\u00edstn\u00ed pos\u00edlen\u00ed<\/td><td class=\"has-text-align-center\" data-align=\"center\">M\u016f\u017ee sni\u017eovat ta\u017enost; t\u011b\u017eko se rovnom\u011brn\u011b nan\u00e1\u0161\u00ed na tlust\u00e9 d\u00edly.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Quench &amp; temper<\/td><td class=\"has-text-align-center\" data-align=\"center\">Martenzit + temperovan\u00e1 struktura<\/td><td class=\"has-text-align-center\" data-align=\"center\">Mnoho ocel\u00ed<\/td><td class=\"has-text-align-center\" data-align=\"center\">Pevn\u00e9 a odoln\u00e9, kdy\u017e je to spr\u00e1vn\u011b provedeno<\/td><td class=\"has-text-align-center\" data-align=\"center\">M\u00e9n\u011b vhodn\u00e9 pro mnoho hlin\u00edkov\u00fdch slitin; riziko deformace\/prask\u00e1n\u00ed<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>To je tak\u00e9 odpov\u011b\u010f: Jak\u00fd je rozd\u00edl mezi popou\u0161t\u011bn\u00edm a sr\u00e1\u017ekov\u00fdm kalen\u00edm? Popou\u0161t\u011bn\u00ed je krok, kter\u00fd se pou\u017e\u00edv\u00e1 hlavn\u011b po kalen\u00ed oceli k \u00faprav\u011b tvrdosti a hou\u017eevnatosti martenzitu. Sr\u00e1\u017eec\u00ed kalen\u00ed je odli\u0161n\u00fd proces kalen\u00ed, p\u0159i kter\u00e9m se ve specifick\u00fdch slitin\u00e1ch b\u011bhem st\u00e1rnut\u00ed vytv\u00e1\u0159ej\u00ed precipit\u00e1ty.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Mapa aplikac\u00ed (letectv\u00ed, l\u00e9ka\u0159stv\u00ed, automobilov\u00fd pr\u016fmysl, n\u00e1stroje, energetika)<\/h3>\n\n\n\n<p>Sr\u00e1\u017ekov\u00e9 kalen\u00ed se projevuje tam, kde je d\u016fle\u017eit\u00e1 pevnost v pom\u011bru k hmotnosti, odolnost proti korozi nebo pevnost za tepla.<\/p>\n\n\n\n<p>V leteck\u00fdch konstrukc\u00edch pom\u00e1h\u00e1 sr\u00e1\u017een\u00edm tvrzen\u00fd hlin\u00edk sn\u00ed\u017eit hmotnost p\u0159i zachov\u00e1n\u00ed tuhosti. U armatur n\u00e1chyln\u00fdch ke korozi m\u016f\u017ee PH nerezov\u00e1 ocel zajistit pevnost a odolnost proti korozi. V energetick\u00fdch a lopatkov\u00fdch stroj\u00edch zvl\u00e1dnou niklov\u00e9 sr\u00e1\u017een\u00edm zpevn\u011bn\u00e9 slitiny vysok\u00e9 nam\u00e1h\u00e1n\u00ed p\u0159i vysok\u00fdch teplot\u00e1ch, kdy by mnoh\u00e9 oceli zm\u011bkly.<\/p>\n\n\n\n<p>V n\u00e1stroj\u00edch a form\u00e1ch se \u010dasto pou\u017e\u00edv\u00e1 sr\u00e1\u017eec\u00ed kalen\u00ed, proto\u017ee m\u016f\u017ee po obr\u00e1b\u011bn\u00ed zajistit stabiln\u00ed kone\u010dn\u00fd stav. Pokud jste n\u011bkdy honili p\u0159\u00edsnou toleranci na vlo\u017ece formy, v\u00edte, pro\u010d je obl\u00edben\u00fd postup \u201cobr\u00e1b\u011bt na m\u011bkko, pak zest\u00e1rnout na kone\u010dnou tvrdost\u201d.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/6-1024x768.webp\" alt=\"co je to st\u00e1rnut\u00ed\" class=\"wp-image-8698\" srcset=\"https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/6-1024x768.webp 1024w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/6-300x225.webp 300w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/6-768x576.webp 768w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/6-16x12.webp 16w, https:\/\/www.uneedpm.com\/wp-content\/uploads\/2026\/02\/6.webp 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Kter\u00e9 slitiny lze sr\u00e1\u017ekov\u011b kalit?<\/h3>\n\n\n\n<p>Zjednodu\u0161en\u011b lze \u0159\u00edci, \u017ee slitiny lze sr\u00e1\u017eec\u00edm zp\u016fsobem vytvrzovat, pokud jejich chemismus a f\u00e1zov\u00fd diagram umo\u017e\u0148uj\u00ed u\u017eite\u010dnou posloupnost: rozpou\u0161t\u011bn\u00ed p\u0159i vysok\u00e9 teplot\u011b, zachycen\u00ed p\u0159esycen\u00e9ho stavu ochlazen\u00edm a n\u00e1sledn\u00e9 vytvo\u0159en\u00ed jemn\u00fdch sra\u017eenin b\u011bhem st\u00e1rnut\u00ed.<\/p>\n\n\n\n<p>Mezi b\u011b\u017en\u00e9 materi\u00e1ly pro precipita\u010dn\u00ed kalen\u00ed pat\u0159\u00ed mnoho slitin hlin\u00edku, PH nerezov\u00e9 oceli, n\u011bkter\u00e9 slitiny niklu, mnoho slitin m\u011bdi s obsahem berylia a n\u011bkter\u00e9 slitiny titanu. N\u011bkter\u00e9 slitiny ho\u0159\u010d\u00edku lze rovn\u011b\u017e zpevnit st\u00e1rnut\u00edm.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Shrnut\u00ed: kl\u00ed\u010dov\u00e1 \u010d\u00edsla + rychl\u00e1 \u201cprocesn\u00ed karta\u201d<\/h2>\n\n\n\n<p>Chcete-li si rychle zkontrolovat proces zpev\u0148ov\u00e1n\u00ed sr\u00e1\u017eek, pou\u017eijte tento seznam:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u00daprava roztoku za vzniku jednof\u00e1zov\u00e9ho pevn\u00e9ho roztoku<\/li>\n\n\n\n<li>Chlazen\u00ed (rychl\u00e9 ochlazen\u00ed) pro udr\u017een\u00ed p\u0159esycen\u00e9ho pevn\u00e9ho roztoku<\/li>\n\n\n\n<li>St\u00e1rnut\u00ed p\u0159i \u0159\u00edzen\u00e9 teplot\u011b st\u00e1rnut\u00ed za \u00fa\u010delem vytvo\u0159en\u00ed jemn\u00e9 sra\u017eeniny a zv\u00fd\u0161en\u00ed pevnosti a tvrdosti.<\/li>\n<\/ul>\n\n\n\n<p>A nezapome\u0148te na nej\u010dast\u011bj\u0161\u00ed p\u0159\u00ed\u010diny selh\u00e1n\u00ed: nespr\u00e1vn\u00fd \u010das\/teplota, nerovnom\u011brn\u00fd oh\u0159ev, deformace p\u0159i kalen\u00ed a nekontrolovan\u00e1 doba p\u0159i pokojov\u00e9 teplot\u011b (zejm\u00e9na u n\u011bkter\u00fdch druh\u016f hlin\u00edku).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Nej\u010dast\u011bj\u0161\u00ed dotazy<\/h2>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">Odkazy:<\/h2>\n\n\n\n<p><a href=\"https:\/\/nvlpubs.nist.gov\/nistpubs\/sp958-lide\/014-015.pdf\">https:\/\/nvlpubs.nist.gov\/nistpubs\/sp958-lide\/014-015.pdf<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/Work_hardening\">https:\/\/en.wikipedia.org\/wiki\/Work_hardening<\/a><\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Precipitation hardening, also called age hardening, is a heat treatment method that can make certain metal alloys much stronger without changing the part\u2019s shape. If you\u2019ve ever needed a lighter bracket, a stiffer shaft, or a harder mold insert\u2014but you couldn\u2019t make it thicker\u2014precipitation hardening is often the answer. It works because tiny particles called [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":8693,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_robots_primary_cat":"none","_seopress_titles_title":"","_seopress_titles_desc":"Precipitation hardening strengthens alloys via solution treatment, quenching, and aging, boosting hardness for aerospace, automotive, and tooling applications.","_seopress_robots_index":"","_daim_seo_power":"","_daim_enable_ail":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-8690","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/posts\/8690","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/comments?post=8690"}],"version-history":[{"count":1,"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/posts\/8690\/revisions"}],"predecessor-version":[{"id":8699,"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/posts\/8690\/revisions\/8699"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/media\/8693"}],"wp:attachment":[{"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/media?parent=8690"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/categories?post=8690"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.uneedpm.com\/cs\/wp-json\/wp\/v2\/tags?post=8690"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}