锻压技术

304奥氏体不锈钢热变形行为及热加工图

英文标题：Hot deformation behavior and processing map of austenite stainless steel 304

作者：廖喜平谢其军胡成亮赵震

分类号：TG142.71

出版年,卷(期):页码：2017,42(12):150-156

摘要：

在应变速率为0.1~10 s-1、变形温度为800~1200 ℃的变形条件下，利用Gleeble-1500热模拟机对304奥氏体不锈钢进行单向热压缩实验，研究其高温下的流变行为。根据实验数据，304奥氏体不锈钢的流变应力随温度和应变速率变化明显，应变速率越大，变形温度越低，流变应力越大。基于Arrhenius 模型推导出材料的热变形本构方程，并算得材料的热变形激活能为486.0 kJ·mol-1。建立了真应变为0.7时的热加工图，结合微观组织分析表明：变形温度为1025~1200 ℃、应变速率为0.1~0.8 s-1时，材料功率耗散系数大于26%，变形过程中发生动态再结晶，此范围为304奥氏体不锈钢的最佳工艺参数。

The uniaxial hot compress experiments of austenite stainless steel 304 with strain rate of 0.1-10 s-1 and temperature range of 850-1200 ℃ were carried out by Gleebe-1500 thermal mechanical simulation machine. Based on the experimental data, the flow stress of austenite stainless steel 304 has a significant influence on the change of temperature and strain rate, the greater the strain rate is, the lower the deformation temperature and the greater the flow stress are. Then, the constitutive equation was deduced by Arrhenius mode to calculate the activation energy of heat forming for austenite stainless steel 304 which was 486.0 kJ·mol-1, and the hot processing map was established under the true strain of 0.7. The analysis of microstructure shows that the dynamic recrystallization happens with the temperature range of 1025-1200 ℃, the strain rate range of 0.1-0.8 s-1 and the efficiency of power dissipation over 26%, which are the optimum technology parameters for austenite stainless steel 304.

基金项目：

国家自然科学基金资助项目（51475294）

作者简介：廖喜平（1992-），男，硕士研究生 E-mail：Simon-liao@sjtu.edu.cn 通讯作者：胡成亮（1980-），男，博士，副研究员 E-mail：clhu@sjtu.edu.cn

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