Pre-txias isothermal quenching txoj kev

Pre-cooling isothermal quenching method: tseem hu ua cua sov isothermal quenching, cov khoom yog thawj zaug txias hauv chav da dej nrog qhov kub thiab txias (ntau dua Ms), thiab tom qab ntawd xa mus rau chav da dej nrog qhov kub siab dua kom cov austenite undergo isothermal transformation. Nws yog tsim rau steel qhov chaw uas tsis zoo hardenability los yog loj workpieces uas yuav tsum tau austempered.