Lub Austenitic Structure ntawm Alloy
Mar 23, 2026
Austenite yog cov qauv siv lead ua tseem ceeb hauv cov hlau thiab lwm yam hlau -raws li alloys, paub txog nws qhov siab tawv thiab yas. Austenite muaj lub ntsej muag -centered cubic (FCC) qauv, nrog hlau atoms nyob rau ntawm lub vertices thiab lub ntsej muag chaw ntawm lub voos xwmfab, thiab carbon los yog lwm yam alloying ntsiab yuav ua tau ruaj khov- daws nyob rau hauv lub interstices.
Austenite yog microstructure ntawm cov hlau. Nws yuav tsum ua kom tau raws li ob yam xwm txheej:
1. Cov qauv siv lead ua ntawm cov hlau yog lub ntsej muag -centered cubic (FCC) qauv.
2. Cov hlau yog cov khoom siv tshuaj.
Austenite muaj cov yam ntxwv ntawm cov yas zoo, tsis tshua muaj thermal expansion coefficient, thiab zoo siab - kub ua haujlwm. Yuav luag txhua hom stainless hlau thiab siab - kub alloys yog austenitic alloys.
Hauv kev siv cov tswv yim, cov yas zoo ntawm austenitic alloys ua rau lawv ua haujlwm ruaj khov rau lub sijhawm ntev hauv qhov kub thiab txias, uas yog vim li cas feem ntau siv stainless hlau yog tag nrho cov austenitic stainless hlau.
Lwm tus yam ntxwv tseem ceeb ntawm austenitic alloys yog lawv cov kev ua tau zoo heev - kub. Thaum qhov kub thiab txias, lub ntsej muag - nruab nrab cubic qauv tuaj yeem tswj cov qauv kev ruaj ntseg zoo dua, yog li ua kom lub zog ntawm austenitic alloys ntawm qhov kub thiab txias. Qhov no yog vim li cas yuav luag tag nrho cov siab - kub alloys yog austenitic alloys.
Yog li dab tsi txiav txim siab seb cov hlau puas muaj cov qauv austenitic?
Tam sim no, peb paub tias austenitic alloys yuav tsum muaj lub ntsej muag -centered cubic (FCC) qauv. Yog li, peb yuav tsum nkag siab ntxiv txog cov hlau twg muaj cov qauv FCC.
Cov hlau feem ntau yog hlau, thiab hlau hlau tiag tiag muaj cov qauv FCC. Hmoov tsis, hlau muaj allotropy zog. Qhov ntawd yog hais tias, hlau tsuas tuaj yeem tswj hwm tus qauv FCC nyob rau hauv qhov kub ntawm 912℃txog 1394 degree. Ntawm lwm qhov kub, hlau hloov mus rau hauv lub cev -centered cubic (BCC) qauv.
Nyob rau ntawm lub sijhawm no, peb xav tau cov khoom siv hlau uas tuaj yeem lav FCC qauv ntawm qhov kub thiab txias. Cov khoom no yog npib tsib xee. Ntev npaum li cov ntsiab lus npib tsib xee ntawm cov hlau yog siab dua 9%, FCC qauv tuaj yeem tswj tau. Yog li ntawd, tsuas yog ntxiv 9% los yog ntau tshaj npib tsib xee rau hlau tuaj yeem ua rau cov hlau muaj cov qauv austenitic ntawm qhov kub thiab txias. Qhov no yog vim li cas tag nrho cov hlau tsis muaj steel thiab siab -kub alloys muaj nickel.
