【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%。更多还原

【Abstract】 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 steal 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 marteasite.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.R_m 1 301 MPa,R_P0.2928 Mpa,A 23.8%and Z 38.6%.更多还原