20CrH钢热变形流动应力的研究

Stady on flow stress of steel 20crh at hot deformation

在Gleeble 15 0 0热模拟机上 ,分别在温度为 85 0℃、 95 0℃、 10 5 0℃、 115 0℃ ,应变速率为 0 6/s和 0 8/s条件下 ,对 2 0CrH钢进行了热变形试验 ,获得了流动应力—应力应变曲线。根据最小二乘原理回归出选用不同数学模型时该钢种流动应力的数学公式 ,并且用数理统计对回归结果进行了评价。

The compression experiments of steel 20CrH are done using Gleeble\|1500 thermomechanical simulator at temperature 850℃?950℃?1050℃?1150℃ with strain rate 0 6 per second and 0 8 per second. The true stress\|strain curves at different temperature and strain rates are obtained.By least square method the flow stress expressions are regressed for different mathematical models and the results of regression are evaluated using mathematical statistics.