38MnVS6非调质钢高温奥氏体流动应力模型研究
Research on Flow Stress Model of 38MnVS6 Non Quenched and Tempered Steel During Hot Forming
王 进1, 褚 忠1, 陈 军2
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作者单位：1. 青岛理工大学 机械工程学院, 山东 青岛 266033; 2. 上海交通大学 国家模具CAD工程研究中心, 上海 200030
中文关键字：38MnVS6； 非调质钢； 流动应力； 动态回复； 动态再结晶
英文关键字：38MnVS6; micro-alloyed forging steel; flow stress; dynamical recovery; dynamical recrystallization
中文摘要：采用Gleeble-1500热模拟试验机对38MnVS6非调质钢在温度为950～1200 ℃、应变速率为0.01～5 s-1进行热压缩试验， 获得不同变形条件下的流动应力曲线。 根据经典应力-位错关系和动态再结晶动力学方程分别对动态回复和动态再结晶两阶段建立流动应力模型， 然后统一表示为完整的38MnVS6非调质钢高温奥氏体流动应力模型。根据实验结果计算模型中各参数。所建立的流动应力模型可以用于38MnVS6非调质钢热锻造过程的数值模拟。
英文摘要：Hot compression test of 38MnVS6 non-quenched and tempered steel was finished on Gleeble-1500 in the temperature rang of 950 ℃～1200 ℃ and the strain rate of 0.01～5 s-1, the flow stress curves were obtained. The flow stress models were approximated for dynamical recovery period and dynamical recrystallization period based on classical stress-dislocation relation and the kinematics of dynamic recrystallization, respectively, which show the flow stress model for the whole forming process. All parameters used in the flow stress models were calculated based on testing data. The flow stress model is suitable for simulating hot forging process.