1. Lim caij nplooj ntoos hlav tempering tov
Lub caij nplooj ntoos hlav tempering tov yog hais txog kev siv tensile kev ntxhov siab sib npaug li 20% ~ 40% ntawm tensile lub zog ntawm ob qho kawg ntawm tempered steel hlau, cov hlau hlau ua rau cov kab mob nyob rau hauv cov nyhuv tensile, thiab cov kab dislocation txav. Cov carbides dispersed thiab precipitated thaum lub sij hawm tag nrho cov txheej txheem ntawm tempering ua ke qhia ib tug loj tus naj npawb ntawm pinning ntsiab lus, uas ua rau lub dislocation "pinning" ntau meej thiab txaus, txhim kho cov yas deformation tsis kam ntawm cov hlau hlau, thiab txhim kho cov elastic txo cov yam ntxwv ntawm lub steel hlau.
2. Induction caij nplooj ntoos hlav cua sov tov
Cov cua kub ceev ntawm lub caij nplooj ntoos hlav induction yog ceev, qhov saum npoo oxidation ntawm cov hlau hlau yog lub teeb, nws tsis yooj yim los ua decarburization, thiab cov nplej tseem ua kom zoo dua qub, thiab lub caij nplooj ntoos hlav coil yog ua los ntawm cov roj quenching-tempering steel hlau ua los ntawm high-frequency induction cua sov, uas muaj zoo toughness thiab elastic txo cov yam ntxwv nyob rau hauv zoo li qub load thiab dynamic load, thiab lub luj yuav txo tau los ntawm 10% ~ 20% nyob rau hauv lub txij nkawm ntawm lub thawj theem qauv ntawm lub caij nplooj ntoos hlav index. Nws yog lub caij nplooj ntoos hlav hlau uas muaj vanadium thiab niobium, thiab tsuas yog qhov kub austenitizing ntau dua tuaj yeem siv los ua kom tiav cov vanadium thiab niobium, thiab cov nyhuv ntawm tempering thiab theem nrab hardening tuaj yeem tau txais. Raws li cov txheej txheem cua sov li niaj zaus, qhov kub austenitization siab dhau lawm, cov hlau xaim hlau yog coarsen, thiab cov nplaim oxidation thiab decarburization kuj hnyav heev, uas cuam tshuam rau lub neej qaug zog. Thaum cov cua kub induction ncav cuag 800 ~ 1000 degree, cov hlau hlau tsis yooj yim rau decarburize, loj oxidation thiab grain coarsening. Yog li ntawd, induction cua sov tuaj yeem muab kev ua si tag nrho rau qhov zoo ntawm lub caij nplooj ntoos hlav steels uas muaj vanadium thiab niobium.
