优质弹簧钢60Si2CrVAT控轧控冷工艺的热模拟研究  

Thermal Simulation Study on Controlled Rolling and Cooling Process for Quality Spring 60Si2CrVAT

作　　者：黄学启[1] 刘雅政[1] 崔娟[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《特殊钢》2007年第6期21-23,共3页Special Steel

基　　金：北京市科技计划基金(D0404001040221)

摘　　要：用Gleeble-1500热模拟实验机测定了优质弹簧钢60Si2CrVAT的CCT曲线,并用光学显微镜和透射电镜研究了不同的终轧温度、冷却速度下的组织和相变。结果表明,冷速为1℃/s时,弹簧钢60Si2CrVAT中的珠光体含量约为98%;随着冷速的增加,铁素体和珠光体的含量逐渐减小,贝氏体和马氏体含量逐渐增加;当冷速达到9℃/s时,基体全部为马氏体;终轧温度850℃、冷速为1℃/s时,弹簧钢60Si2CrVAT的索氏体含量达到90%,强塑性最好,即R_m 1301 MPa,R_(p0.2) 928 MPa,A 23.8%,Z 38.6%。The continuous cooling transformation （CCT） curves, structure and phase transformation of quality spring steel 60Si2CrVAT with different finishing rolling temperature and cooling rate have been examined and studied by Gleeble- 1500 thermal mechanical simulator, optical microscope and transmission electron microsope. Results showed that as cooling rate was 1 ℃/s, the pearlite content in spring steel 60Si2CrVAT was about 98% ; with increasing cooling rate the ferrite and pearlite content gradually decreased while bainite and martensite content increased; and as cooling rate was up to 9 ℃/s, the matrix was all martensite. With finishing temperature 850 ℃ and cooling rate 1 ℃/s, the sorbite content in spring steel 60Si2CrVAT was up to 90% with excellent strength and toughness i.e. Rm 1 30l MPa, Rp0.2 928 Mpa, A 23. 8% and Z 38. 6%.

关 键 词：弹簧钢60Si2CrVAT 组织演变 CCT曲线 控轧控冷 

分 类 号：TG335[金属学及工艺—金属压力加工]