Abstract: Hot compression deformation of steel wheel CL70 with strain rate 0. 01 ~ 10 s^-1 at 900 ~ 1300 ℃ has been tested and studied by using Gleeble-3800 thermo-mechanical simulator to analyze in hot deformation of the steel the relation between flow stress, strain rate and deformation temperature and get the flow stress constitutive equation. Results show that the flow stress increases of with the increase strain rates and decreases of temperature, and as the strain rate is less than 1 s^-1 ,the feature of dynamic recrystallization occurs obviously on flow stress curves of steel CL70. The hot deform activation energy of steel CL70 is 401.06 kJ/moL

摘要： 用Gleeble-3800热模拟机研究了CL70车轮钢在应变速率0. 01～10s^-1、900～1300 ℃时的高温热压缩行为,分析了热压缩变形时该钢的流变应力、变形温度及应变速率之间的关系,通过线性回归确定该钢流变应力本构方程。结果表明,CL70钢在高温压缩时流变应力随变形温度的减小而增大,随应变速率升高而增大。当应变速率≤1 s^-1时,CL70钢的流变应力曲线表现为动态再结晶特征。CL70钢的热变形激活能为401.06 kJ/mol。