论文部分内容阅读
研究了淬火-等温-回火(Q-I-T)新工艺对60Si2CrVA弹簧钢显微组织的影响。通过残余奥氏体的测定、金相观测和TEM分析研究,结果表明:淬火-等温(Q-I)处理后获得50%~60%马氏体M(针束状)+30%~40%贝氏体B+大于10%残余奥氏体Ar组织;据统计贝氏体条宽度在100~500 nm之间,亚单元尺寸在50~250 nm之间,残余奥氏体以薄膜状分布于马氏体、贝氏体束条之间;经400℃回火后残余奥氏体大量分解,并析出部分细小碳化物。与传统淬火回火工艺相比,新工艺组织得到分割细化,并获得复相组织。
The effect of quenching-isothermal-tempering (Q-I-T) on the microstructure of 60Si2CrVA spring steel was studied. The results show that the martensite M (needle bundle) of 50% ~ 60% + 30% ~ 40% Bayesian can be obtained by quenching-isothermal treatment after the residual austenite, metallographic observation and TEM analysis. According to statistics, the width of bainite is between 100 and 500 nm, the size of subunit is between 50 and 250 nm, and the residual austenite is distributed in the form of film in martensite , Bainite between the beam; After 400 ℃ tempering residual austenite a large number of decomposition, and part of the precipitation of small carbides. Compared with the traditional quenching and tempering process, the new process of organization and refinement of the division, and access to complex phase organization.