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利用Gleeble-3800热模拟试验机在温度为1 040~1 120℃,应变速率为1~20s-1的条件下进行了高N马氏体不锈轴承钢的热压缩变形试验。结合真应力-真应变曲线和热变形组织研究了变形参数对高N马氏体不锈轴承钢的热变形行为和碳氮化物演变规律的影响。结果表明:在该变形条件下,试验钢的真应力-真应变曲线为动态再结晶型。随着应变量的增大,碳化物的平均尺寸呈减小趋势,但数量有所增多。基于热变形方程计算得到的应变量为0.6时的热变形激活能Q为410.7kJ/mol。构建了包含应变量在内的流变应力方程,同时建立了高N马氏体不锈轴承钢的Zener-Hollomon参数本构方程。
The hot compressive deformation test of high N martensitic stainless steel bearing was carried out with Gleeble-3800 thermal simulator at a temperature of 1 040 ~ 1 120 ℃ and a strain rate of 1 ~ 20s-1. The effect of deformation parameters on thermal deformation behavior and carbonitride evolution of high N martensitic stainless steel bearing was studied by means of true stress-true strain curve and hot deformation microstructure. The results show that the true stress - true strain curve of the test steel is dynamic recrystallization under this deformation condition. As the amount of strain increases, the average size of carbides decreases, but the number increases. The thermal deformation activation energy Q calculated based on the thermal deformation equation at a strain amount of 0.6 is 410.7 kJ / mol. The flow stress equation including strain is constructed, and the Zener-Hollomon parameter constitutive equation of high N martensitic stainless steel is established.