核电用304不锈钢动态再结晶数学模型的建立

Mathematical Model of Dynamic Recrystallization for Nuclear Power 304 Austenitic Stainless Steel

采用Gleeble-1500D热/力学模拟试验机对304奥氏体不锈钢在变形温度为950℃-1 150℃、变形量为50%,变形速率分别为0.005 s-1、0.01S-1、0.05 s-1和0.1 s-1热变形下的动态再结晶行为进行了研究,构建了动态再结晶动力学及动运学的数学模型。研究结果表明:随着应变量增大、变形温度的升高、应变速率的减小,发生动态再结晶的趋势增大,现象越明显;动态再结晶动力学及运动学模型的建立为304不锈钢大锻件进一步的有限元分析提供了可靠的理论依据。

The of 304 austenite stainless steel under the deformation of 50%,the strain rate of 0.005 S-1,0.01 S-1,0.05 S-1,0.1 S-1 at 950 ℃-1 150 ℃ was studied using the Gleeble-1500D thermal / mechanical simulation testing machine.The dynamic and kinematic models were build.The results show that the trend of dynamic recrystallization increases with increasing deformation and temperature and decreasing rate.Dynamic model and kinematic model of DRX provides a reliable theoretical basis for further finite element analysis of 304 stainless steel heavy forgings.