Cov phaj rauj ntawm lub tshuab tsoo yuav tsoo cov khoom siv hauv qab kev sib hloov ceev ceev, yog li ntawd nws thiaj li dais tau qhov cuam tshuam ntawm cov khoom siv. Cov khoom siv uas yuav tsum tau tsoo yog cov khoom uas muaj qhov nyuaj siab xws li hlau ore thiab pob zeb, yog li cov phaj rauj yuav tsum muaj qhov nyuaj thiab tawv txaus. Raws li cov ntaub ntawv kev siv tshuab, tsuas yog thaum qhov nyuaj thiab qhov cuam tshuam ntawm cov khoom siv ncav cuag HRC> 45 thiab α> 20 J / cm² feem tuaj yeem ua tiav cov kev cai ua haujlwm raws li cov xwm txheej ua haujlwm saum toj no.
Raws li cov yam ntxwv ua haujlwm thiab cov kev xav tau ntawm cov phaj rauj, cov ntaub ntawv feem ntau siv yog cov hlau manganese siab thiab cov hlau tsis tshua muaj hlau hnav-resistant. Cov hlau manganese siab muaj kev tiv thaiv zoo hnav thiab muaj zog. Tom qab quenching + tempering kub qis, cov hlau tsis tshua muaj hlau hnav-resistant tsim cov qauv martensite muaj zog thiab tawv, uas txhim kho qhov nyuaj ntawm cov hlau thaum khaws cia cov tawv zoo. Ob qho tib si cov ntaub ntawv tuaj yeem ua tau raws li cov kev xav tau ua haujlwm ntawm cov phaj rauj.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-17-2025