不同热变形条件下310S奥氏体不锈钢动态再结晶行为研究

Study on Dynamic Recrystallization Behavior of 310S Austenitic Stainless Steel Under Different Heat Deformation Conditions

利用显微组织观察和显微硬度测试两种方法研究了热压缩试验后的310S奥氏体不锈钢动态再结晶行为,热压缩试验在Gleeble-3800热模拟试验机上进行,应变速率采用0.1s-1和1s-1、变形温度在900~1150℃之间。研究结果表明,随着变形温度的升高,310S奥氏体不锈钢的变形抗力降低。在应变速率为0.1s-1时,其完全动态再结晶的变形温度为1000℃;应变速率升高至1s-1时,其完全动态再结晶的变形温度升高至1100℃,高的应变速率可以细化再结晶晶粒。

The dynamic recrystallization behavior of 310S austenitic stainless steel was analyzed by microstructure obser- vation and micro-hardness test. The hot compression tests of 310S steel were carried out at temperatures ranging from 900 ℃ to 1 150℃ and strain rates from 0.1 s 1 to 1 S I using a Gleeble-3800 thermal simulator. The results show that the flow stress of 310S steel decreases with increasing deformation temperature. The complete dynamic recrystallization temperature is about 1 000 ℃ at stain rate of 0.1 s-1. When the strain rate reaches 1 s-1, the complete dynamic recrystallization temperature increases sharply to 1 100℃, and higher stain rate can significantly refine the recrystalized grains.