9Cr18不锈钢热变形行为研究

Hot deformation behavior of 9Cr18 stainless steel

采用Gleeble-1500型热模拟试验机对9Cr18马氏体不锈钢在850～1 150℃、应变速率为0.01～10s-1变形条件下的热压缩变形行为进行研究。根据真应力-应变曲线,分析变形温度和应变速率对9Cr18不锈钢变形抗力的影响,计算其形变激活能,并建立9Cr18不锈钢的变形抗力模型和热变形流变应力方程。结果表明,应变速率一定时,9Cr18动态再结晶临界变形量εc随温度的升高而降低,高的形变温度和低的应变速率有利于动态再结晶的发生;9Cr18不锈钢形变激活能为461.7kJ/mol;所建变形抗力模型的拟合性良好,数据稳定性好。

Hot deformation behavior of 9Cr18 martensitic stainless steel was investigated by conducting hot compression tests on the Gleeble-1500 thermal simulation testing machine at the temperatures of 850-1 150 C and the strain rates of0.01-10 s^-1. According to the true stress-strain curve obtained from the test, the influence of deformation temperature and strain rate on 9Cr18 stainless steel deformation resistance was investigated, the apparent activation energy was calculated, and the deformation resistance model and the hot deformation flow stress equation were established. It is found that ε, decreases with the increase of temperature when the strain rate is fixed, and high deformation temperature and low strain rate promote the dynamic recrystallization. The apparent activation energy is found to be about 461.7 kJ/mol, and the model is proved to have excellent linear fitting and data stability.