压应力对Cr-Mo钢连续冷却贝氏体相变的影响Effect of pressure stress on bainitic transformation in Cr-Mo steel with continuous cooling
渠秀娟,李维娟,巨东英
摘要(Abstract):
采用Gleeble-1500热模拟试验机测量了Cr-Mo钢在1~90℃/s的冷却速度下奥氏体连续冷却过程中的温度-膨胀曲线,用origin软件进行数据处理,获得了实验钢的CCT曲线;同时测量了施加轴向载荷为0、40MPa、80MPa和120MPa的压应力时奥氏体连续冷却过程中的温度.膨胀曲线,冷却速度分别为50℃/s、70℃/s和90℃/s。利用杠杆定律,根据不同温度下的膨胀量计算得到贝氏体相变动力学曲线,研究了压应力对贝氏体相变动力学和贝氏体相变温度的影响。结果表明,在以冷却速度为50℃/s和70℃/s连续冷却时,压应力抑制前期阶段的贝氏体相变,促进后期阶段的贝氏体相变:在以冷却速度为90℃/s连续冷却时,压应力对整个贝氏体相变过程都有促进作用,特别是应力较大时;压应力使贝氏体相变开始温度B_s升高,贝氏体相变终了温度B_f降低。
关键词(KeyWords): Cr-Mo钢;压应力;贝氏体;相变动力学
基金项目(Foundation):
作者(Author): 渠秀娟,李维娟,巨东英
参考文献(References):
- [1]Shipway P H,Bhadeshia H K D H.The effect of small stresses on the kinetics of the bainite transformation[J].Materials Science and Engineering A,1995, 194:179-186.
- [2]Heung Nam Han,Dong-Woo Suh.A model for transformation plasticity during bainite transformation of steel under external stress[J].Acts Materialia,2003, 51:4907-4917
- [3]徐祖耀.应力对钢中贝氏体相变的影响.金属学报[J],2004,2(40):113-119 Zu yaoXu.Effect of stress on bainitic transformation in steel.Metals Journal[J],2004,2(40):113-119
- [4]Girault E,Jacques P,Ratchev P,etal.Study of the temperature dependence of the bainitic transformation rate in a multiphase TRIP-assisted steel[J].Materials Science and Engineering A,1999,273-275:471-474
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