锻压技术

考虑应变补偿的铸态42CrMo钢本构模型

英文标题：Constitutive model of ascast 42CrMo steel based on strain compensation

作者：陈园园李永堂庞晓龙齐会萍

单位：太原科技大学晋中学院

分类号：TG333

出版年,卷(期):页码：2021,46(5):246-252

摘要：

采用Gleeble-3500D热模拟实验机对铸态42CrMo钢进行高温拉伸实验，应变速率范围为0.01~5 s-1，变形温度范围为1000~1150 ℃，得到铸态42CrMo钢在不同工艺参数下的流动应力-应变曲线，研究其高温拉伸成形工艺，分析变形温度和应变速率对铸态42CrMo钢流动应力的影响。考虑应变对各材料参数的影响，采用四次多项式拟合应变与各材料参数的线性关系，其相关系数R在0.95以上；借助传统Arrhenius模型拟合实验结果，建立考虑应变补偿的Arrhenius本构模型及基于应变补偿的采用Z函数表示的流动应力方程。计算结果表明，流动应力计算值与实验值的相关系数为0.992、平均相对误差为6.13%，从而验证了该模型的准确性较高，可用于数值模拟。

The high temperature tensile tests of as-cast 42CrMo steel were performed by thermal simulator Gleeble-3500 under the strain rate of 0.01-5 s-1 and the deformation temperature of 1000-1150 ℃, and the flow stress-strain curves of as-cast 42CrMo steel under different process parameters were obtained. Then, the high temperature tensile process of as-cast 42CrMo steel was studied, and the influences of deformation temperature and strain rate on flow stress of as-cast 42CrMo steel were analyzed. Considering the effect of strain on different material parameters, the linear relationships between strain and material parameters were fitted by the fourth order polynomial, and the correlation coefficient R was above 0.95. Furthermore, the experimental results were fitted by the traditional Arrhenius model, and the Arrhenius constitutive model and the flow stress equation described by Z function based on the strain compensation were established. The calculation results show that the correlation coefficient between the calculational value and the experimental value of the flow stress is 0.992, and the average relative error is 6.13%. Therefore, it is proved that the model has high accuracy and can be used in numerical simulation.

基金项目：

国家自然科学基金资助项目（51875383，51575371）

陈园园（1983-），女，博士研究生，讲师 E-mail：123042922@qq.com 通讯作者：李永堂(1957-)，男，博士，教授 E-mail：liyongtang@tyust.edu.cn

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