60Si2Mn钢的动态再结晶动力学模型

Dynamic recrystallization kinetic model of 60Si2Mn steel

研究了60Si2Mn弹簧钢在变形温度730~1000℃、应变速率0.01~5 s^(-1)下的动态再结晶(DRX)行为。通过对试验钢单道次热压缩试验的数据处理,得到了流变应力曲线;借助加工硬化率拟合出各热变形条件下的动态回复曲线,建立动态再结晶动力学模型,根据模型预测出不同热变形参数下的动态再结晶体积分数。结果表明,弹簧钢的动态再结晶行为对变形温度和应变速率敏感。随着应变速率的降低或变形温度的升高,动态再结晶软化的临界应变降低,DRX的体积分数增加。预测值与试验值吻合良好,验证了动态再结晶动力学模型对弹簧钢的适用性。

Dynamic recrystallization(DRX)behavior of 60Si2Mn spring steel at deformation temperature of 730⁃1000℃and strain rate of 0.01⁃5 s^(-1)was studied.The flow stress curves were obtained by processing the data of single⁃pass hot compression test of the tested steel.The dynamic recovery curves under different hot deformation conditions were fitted by the work hardening rate,and the dynamic recrystallization kinetic model was established.According to the model,the dynamic recrystallization volume fraction under different hot deformation parameters was predicted.The results show that the dynamic recrystallization behavior of the spring steel is sensitive to deformation temperature and strain rate.With the decrease of strain rate or the increase of deformation temperature,the critical strain of dynamic recrystallization softening decreases and the volume fraction of DRX increases.The predicted values are in good agreement with the experimental values,which verifies the applicability of the dynamic recrystallization kinetic model established for the spring steel.