AISI403马氏体不锈钢的热变形特性研究

摘要

采用Gleeble-1500D热模拟试验机对AISI403马氏体不锈钢进行高温热压缩实验,结合金相组织观察,对其流变应力进行了研究.结果表明:403钢在950～1150℃,应变速率为0.01～0.1s-1的条件下,发生了较明显的动态再结晶；利用Zener-Hollomon参数的双曲对数函数能较好地描述403钢的流变行为；经回归得到了403钢峰值应力σp的表达式和热变形激活能Q值；通过热加工图的建立获得最佳热变形条件及预测流变失稳区.%The hot compression experiment of AISI403 martensitic stainless steel was carried out by using Gleeble-1500D,and its flow stress was also investigated by means of microstructure analysis.The results show that the dynamic recrystallization of 403 steel occurs obviously at 950-1150℃ and strain rate from 0.01s-1 to 0.1s-1.The flow stress of 403 steel can be described well by a Zener-Hollomon parameter in the hyperbolic logarithm type equation.The regressed peak stress expression σp and the hot deformation activation energy Q of 403 steel during hot compression were concluded.Through the establishment of hot processing map,the best hot compression condition and the instability zones of flow behavior were acquired.