摘要
利用Gleeble-3800热模拟试验机在温度为1040-1120℃，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。结合真应力一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，试验钢的真应力一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 compression test of high nitrogen martensitic stainless steel was carried out using Gleeble-3800 thermal-mechanical simulator within temperature range of 1040--1 120℃ and strain rate range of 1- 20 s^-1. Combining with true stress-true strain curve and microstructure after hot deformation, the influences of deformation parameters on the hot deformation behavior and evolution law of carbon nitrides of high nitrogen martensitic stainless bearing steel were studied. The results indicate that the true stress-strain curves of the material are dynamic recrystallization type under the present deformation conditions. It is also observed that, as strain increases, the average size of carbides decreases gradually and the number of carbides increases. Based on the equation for hot deformation, the deformation activation energy （Q） of 410.7 kJ/mol was obtained at a strain of 0.6. The flow stress equation including strain and the constitutive equation of Zener-Hollomon parameter for high nitrogen martensitic stainless steel were established.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2014年第7期48-54,82,共8页
Journal of Iron and Steel Research
