中文摘要：

使用Gleeble-1500D热模拟试验机对20Cr Mn Ti钢进行等温压缩实验,选择应变速率为0.01、0.1、1和5 s-1,变形温度为900℃、950℃、1 000℃、1 050℃和1 100℃;通过金相观察,分析了变形参数对流变应力的影响;采用Arrhenius型模型建立流变应力本构方程。结果表明,20Cr Mn Ti钢动态再结晶的显微组织受变形条件影响显著;流变应力随变形温度升高而减小,随应变速率的提高而增大;用Arrhenius型方程描述20Cr Mn Ti钢热变形行为时,其变形激活能Q为327.874 9 k J/mol。

英文摘要：

The hot compression tests of 20CrMnTi steel were performed？ using Gleeble-1500D machine. The strain rates were 0.01, 0. 1, 1 and 5 s-l and the temperatures were 900, 950, 1 000, 1 050 and 1 100 ℃. The effects of parameters on flow stress were analyzed via microscopic examination. The results show that the deformation conditions have significant effects on the microstrueture of 20CrMnTi steel after dynamic recrystallization. The flow stress decreases as deformation temperature increases and increases with the increase of strain rate. The deformation activation energy of 20CrMnTi steel during hot deformation is 327. 8749 kJ/mol by Arrhenius equation.