锻压技术

基于动态材料模型的Cr8钢的热加工图

英文标题：Hot processing map of Cr8 steel based on dynamic material model

作者：马雪飞姜君李红雷

分类号：TG142.1

出版年,卷(期):页码：2019,44(1):166-171

摘要：

采用Gleeble-1500D热模拟试验机对Cr8钢进行了高温压缩试验，研究了Cr8钢在变形温度为900~1200 ℃、应变速率为0.005~5 s-1条件下的热变形行为。基于试验得到Cr8钢的真应力-真应变曲线，采用动态材料模型和Ziegler失稳判据建立了Cr8钢的热加工图。结果表明：当应变速率小于1 s-1时，该合金的热变形流变曲线呈现出典型的动态回复型特征；材料的失稳区主要发生在高应变速率的区域，并且随着应变的增加，功率耗散因子增加。根据已建立的热加工图，得到了Cr8钢的最佳加工工艺参数为变形温度1125~1190 ℃、应变速率0.005~0.01 s-1。分析加工图中非失稳区的金相照片，该材料的显微组织发生了动态再结晶，获得的组织晶粒细小且分布均匀；分析加工图中失稳区的金相照片，该材料的显微组织中出现了很多剪切带，验证了该热加工图的正确性。

The hot compression test at high temperature of Cr8 steel was conducted by thermal simulation test machine Gleeble-1500D, and its hot deformation behavior under temperature of 900-1200 ℃ and strain rate of 0.005-5 s-1 was studied. Then, the true stressstrain curve of Cr8 steel was obtained by test, and the hot processing maps of Cr8 steel were constructed by dynamic material model and Ziegler instablilty criterion. The results show that the hot deformation flow curves of this alloy show a typical dynamic recovery feature when the strain rate is less than 1 s-1, and its instability region mainly occurs at the high strain rate zone. With the increasing of strain, the value of power dissipation factor increases. Based on the built hot processing map, the optimum processing technology parameters of Cr8 steel are the temperature of 1125-1190 ℃ and the strain rate of 0.005-0.01 s-1. Furthermore, the dynamic recrystallization occurs in the microstructure of Cr8 steel by analyzing the metallographic photos of non-instability zone in the hot processing map, and the obtained microstructure has fine and uniformly distributed grain. However, many shear zones occur in the microstructure of Cr8 steel by analyzing the metallographic photos of instability zone in the hot processing map, and the correctness of the hot processing map of Cr8 steel is verified.

基金项目：

马雪飞（1981-），男，学士，工程师，E-mail：maxfpg@126.com

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