不同热变形条件下310S奥氏体不锈钢动态再结晶行为研究

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。

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

The dynamic recrystallization behavior of 310S austenitic stainless steel was analyzed by microstructure observation 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–1 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.