Cov khoom tseem ceeb ntawm fasteners yog carbon thiab hlau. Niaj hnub no, cia peb saib ob lub microstructures ntawm stainless hlau fasteners, uas yog martensite thiab austenite.
Martensite muaj hardness, thiab austenite tsis muaj hardness vim nws nyob rau hauv lub kub kub. Qhov sib txawv tseem ceeb poob rau hauv peb pawg: cov duab sib txawv, qhov sib txawv ntom ntom, thiab cov yam ntxwv sib txawv, raws li hauv qab no:
1. Cov ntawv sib txawv
Martensite yog ib lub cev-centered square qauv, thiab peb-dimensional qauv feem ntau muaj ib daim ntawv los yog lath duab, thiab daim ntawv martensite feem ntau tshwm raws li koob nyob rau hauv metallographic soj ntsuam (ob-seem);
Austenite muaj lub ntsej muag-centered cubic qauv, thiab interstitial atoms xws li carbon thiab nitrogen nyob rau hauv nruab nrab ntawm lub octahedral sib txawv ntawm lub austenite unit cell, thiab qhov nruab nrab thiab ntug midpoint ntawm lub ntsej muag-centered cubic unit cell.
2. Qhov sib txawv
Kev hloov pauv ntawm austenite mus rau martensite yuav tsum muaj lub zog me me vim tias qhov kev hloov pauv yog hom kev hloov pauv tsis yog kev hloov pauv, tsuas yog kev hloov pauv sai thiab me me ntawm atoms. Vim lub ntim nthuav dav tom qab hloov pauv, nws tuaj yeem pom tias qhov ntom ntawm martensite qis dua li ntawm austenite.
3. Cov yam ntxwv sib txawv
Martensite muaj lub zog siab thiab siab tawv, tab sis tsis zoo toughness, uas yog tus cwj pwm los ntawm kev nyuaj thiab nkig;
Austenite muaj cov yas zoo, tsis muaj zog, qee qhov toughness, tsis muaj ferromagnetism, tsis zoo thermal conductivity, thiab loj linear expansion coefficient.
