锻压技术

LZ50车轴钢高温拉伸变形本构模型研究

英文标题：Study on constitutive model for LZ50 axle steel under high temperature tensile deformation

关键词：LZ50车轴钢高温拉伸 Johnson-Cook模型 DMNR模型本构方程

分类号：TG142

出版年,卷(期):页码：2023,48(12):224-232

摘要：

为更好地描述LZ50车轴钢的高温拉伸变形行为，采用Gleeble-3800热模拟试验机在变形温度分别为900、1000和1100 ℃，应变速率分别为0.1、1.0和10.0 s-1的条件下对LZ50车轴钢进行了高温拉伸试验，获得了不同变形条件下的应力、应变数据，并基于修正的Johnson-Cook(JC)本构模型和多元非线性回归的本构模型(DMNR)建立了两种LZ50车轴钢的高温拉伸本构模型。将建立的两种模型的预测值与试验数据进行对比，并采用相关系数R以及平均相对误差AARE对建立的两种模型的预测精度进行定量分析。结果表明：两种模型在不同变形温度下的预测能力存在差异；JC模型在900 ℃下的预测能力较好，R值和AARE值分别为0.995和1.20%；在1000 ℃变形温度下， DMNR模型的预测能力较好，R值和AARE值分别为0.997和6.38%；而在1100 ℃下两种模型的预测精度相差不大。

In order to better describe the high-temperature tensile deformation behavior of LZ50 axle steel, high-temperature tensile tests of LZ50 axle steel were conducted by using Gleeble-3800 thermal simulation tester at the deformation temperatures of 900, 1000 and 1100 ℃ and the strain rates of 0.1, 1.0 and 10.0 s-1, respectively, and the stress-strain data were obtained under different deformation conditions. Then, based on the modified Johnson-Cook(JC) constitutive model and the multivariate nonlinear regression constitutive model(DMNR), two high-temperature tensile constitutive models for LZ50 axle steel were established. Furthermore, the predicted values of the two established models were compared with the experimental data, and the prediction accuracies of the two established models were quantitatively analyzed by using correlation coefficient R and average relative error AARE. The results show that the prediction abilities of the two models under different deformation temperatures are different, and JC model has better prediction ability at 900 ℃, with the R and AARE values of 0.995 and 1.20% respectively. However, DMNR model has better prediction ability at the deformation temperature of 1000 ℃, the R and AARE values are 0.997 and 6.38%, respectively, and the prediction accuracies of the two models at 1100 ℃ are similar.

基金项目：

国家重点研发项目（2018YFB1307900）；国家自然科学基金资助项目（52275350）；上海市自然基金项目资助项目（20ZR1422100）

作者简介：李汉林（2002-），男，硕士研究生 E-mail：915610463@qq.com 通信作者：何涛（1979-），男，博士，教授 E-mail：hetao@sues.edu.cn

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