基于GA-Arrhenius本构模型的EA4T钢高温变形行为  

High-temperature deformation behavior for EA4T steel based on GA-Arrhenius constitutive model

作　　者：白杰 霍元明 何涛 任旭 卞志远 王宝雨[2] 杜向阳 Bai Jie;Huo Yuanming;He Tao;Ren Xu;Bian Zhiyuan;Wang Baoyu;Du Xiangyang(School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]上海工程技术大学机械与汽车工程学院,上海201620 [2]北京科技大学机械工程学院,北京100083

出　　处：《锻压技术》2022年第11期246-253,共8页Forging & Stamping Technology

基　　金：国家重点研发计划资助项目(2018YFB1307900);国家自然科学基金青年基金资助项目(51805314)。

摘　　要：通过Gleeble-3800热模拟实验机,对EA4T车轴钢分别在变形温度为970、1070和1170℃及应变速率为0.01、0.1和1.0 s的条件下进行热压缩实验,压缩至最大真应变为0.8。以得到的真应力-真应变实验数据为基础,分别建立了考虑应变补偿的Arrhenius本构模型和经过遗传算法优化后的Arrhenius本构模型(GA-Arrhenius),用于预测真应力与真应变的关系。为了验证GA-Arrhenius本构模型在真应力预测中的优越性,使用相关系数R、平均绝对误差AARE和均方根误差RMSE来说明其预测精度。实验结果表明:采用Arrhenius本构模型时,R=0.9970、AARE=3.4232%、RMSE=2.8773 MPa;采用GA-Arrhenius本构模型时,R=0.9982、AARE=2.6577%、RMSE=2.2110 MPa。说明相较Arrhenius本构模型,GA-Arrhenius本构模型能够更好地预测EA4T钢热成形过程中的真应力与真应变的关系,可以实现更高精度的有限元数值模拟。The thermal compression experiments of EA4 T axle steel were conducted under the deformation temperatures of 970,1070 and 1170℃and the strain rates of 0.01,0.1 and 1.0 sby thermal simulation testing machine Gleeble-3800,and compressed to the maximum true strain of 0.8.Then,based on the obtained true stress-true strain experimental data,the Arrhenius constitutive model considering strain compensation and the Arrhenius constitutive model optimized by genetic algorithm(GA-Arrhenius)were established respectively to predict the relationship between true stress and true strain.In order to verify the superiority of GA-Arrhenius constitutive model in the prediction of true stress,correlation coefficient R,average absolute error AARE and root mean square error RMSE were used to illustrate its prediction accuracy.The experimental results show that when the Arrhenius constitutive model is used,R=0.9970,AARE=3.4232%,RMSE=2.8773 MPa,meanwhile,when the GA-Arrhenius constitutive model is used,R=0.9982,AARE=2.6577%,RMSE=2.2110 MPa,which shows that the GA-Arrhenius constitutive model can better predict the relationship between true stress and true strain in the thermal forming process of EA4 T steel than the Arrhenius constitutive model,and achieve the higher precision finite element numerical simulation.

关 键 词：EA4T钢 热压缩 高温变形行为 Arrhenius本构模型 遗传算法 

分 类 号：TG142[一般工业技术—材料科学与工程]