Thaum lub sijhawm hloov pauv ferrite, cov pa roj carbon diffuses rau hauv austenite, uas ua rau kom muaj zog ntawm theem no. Lub hom phiaj ntawm lub caij txias ceev yog hloov pauv cov austenite ntxiv mus rau martensite.
Qhov kub npaum li cas ua qhov kawg austenite hloov pauv ntawm qhov txias?
A carbon steel uas muaj kwv yees li 0.77% C dhau los ua cov tshuaj tov ntawm txhua qhov kub hauv qhov kub ntawm austenite, piv txwv li, ntawm 725 thiab 1370 C (1340 thiab 2500 F). Tag nrho cov carbon yog yaj nyob rau hauv lub austenite. Thaum cov tshuaj no maj mam txias, ntau qhov kev hloov pauv tshwm sim ntawm 725 C (1340 F).
Cov khoom hloov pauv ntawm austenite yog dab tsi?
Tom qab hla txoj kab A1, cov austenite tseem tshuav hloov mus rau pearlite. Cov tshuaj tiv thaiv no yog hu ua cov tshuaj tiv thaiv eutectoid, thiab nws zoo ib yam nrog cov tshuaj tiv thaiv eutectic ntawm cam khwb cia hlau. Hauv cov tshuaj tiv thaiv eutectoid, cov khoom austenite hloov mus rau ob theem khoom ua ib qho qauv lamellar (eutectic).
Qhov txiaj ntsig ntawm qhov ua kom txias ntawm qhov kub ntawm austenite hloov pauv yog dab tsi?
Ntxiv mus, los ntawm kev nce ntawm qhov txias txias, lub austenite rau ferrite transformation kub txo qis thiab ntim feem ntawm intragranular ferrite nce.
Qhov twg ntawm cov qauv hauv qab no ntawm cov hlau tau txais vim qhov txias txias los ntawm cov qauv austenite hauv txheej txheem hardening?
Piav: Yog cov hlau kubyog txias sai heev lub austenite hloov mus rau hauv ib tug tshiab qauv hu ua ' MARTENSITE'. Cov qauv no zoo heev grained, nyuaj heev thiab sib nqus. Nws yog qhov hnav-tiv taus thiab tuaj yeem txiav lwm yam hlau.
