Lub crankshaft steel C38N2 yog ib hom tshiab ntawm microalloyed tsis-quenched thiab tempered steel, uas hloov quenched thiab tempered steel los tsim Renault cav crankshafts. Cov kab mob ntawm cov plaub hau yog ib qho tsis xws luag hauv lub neej ntawm crankshafts, feem ntau tshwm sim los ntawm metallurgical defects xws li pores thiab looseness nyob rau hauv thawj ingot raug nyem los ntawm cov tub ntxhais mus rau saum npoo thaum lub sij hawm tuag forging txheej txheem. Kev txhim kho qhov zoo ntawm cov tub ntxhais ntawm cov khoom siv crankshaft tau dhau los ua lub hom phiaj tseem ceeb hauv cov txheej txheem dov. Los ntawm kev txo cov softening ntawm lub sij hawm dov txheej txheem, thiab txhawb lub deformation ntawm cov tub ntxhais yog ib tug haum zoo txhais tau tias rau lub looseness thiab shrinkage ntawm cov tub ntxhais ntawm welded cam khwb cia qauv.

Cov kws tshawb fawb los ntawm University of Science thiab Technology Beijing tau kawm txog qhov cuam tshuam ntawm austenitizing tej yam kev mob, deformation kub, deformation tus nqi, deformation npaum li cas, thiab dhau sij hawm ntawm cov tsis-quenched thiab tempered steel C38N2 dov ntawm crankshafts los ntawm thermal simulation thwmsim, optical metallography thiab kis tau tus mob. electron microscopy soj ntsuam. Txoj cai cuam tshuam ntawm static recrystallization ntim feem feem thiab seem strain tus nqi ntawm kev hla.

Cov txiaj ntsig kev sim qhia tau hais tias nrog qhov nce ntawm qhov kub thiab txias, deformation tus nqi, deformation npaum li cas los yog lub sij hawm luv luv ntawm kev hla, qhov ntim feem ntawm cov static recrystallization maj mam nce, thiab cov seem ntawm cov strain ntawm passes txo. ; Tus thawj austenite grain loj nce, thiab qhov zoo li qub recrystallization ntim feem txo qis, tab sis qhov kev hloov pauv tsis tseem ceeb; Hauv qab 1250 ℃, nrog rau austenitizing kub nce, qhov zoo li qub recrystallization ntim feem tsis txo qis, tab sis saum toj no 1250 ℃, qhov nce ntawm austenitizing kub obviously txo qhov zoo li qub recrystallization ntim feem. Los ntawm linear haum thiab me me squares txoj kev, tus lej qauv ntawm kev sib raug zoo ntawm static recrystallization ntim feem thiab sib txawv deformation txheej txheem tsis tau; tus qauv uas twb muaj lawm residual strain rate lej yog hloov kho, thiab cov residual strain rate lej qauv uas muaj cov strain rate term tau. Zoo haum.