Transactions of Materials and Heat Treatment

Title：Modification of constitutive model and evolution of activation energy for forged 42CrMo steel during high temperature deformation process

Authors： Chen Yuanyuan Qi Huiping Li Yongtang Pang Xiaolong

Unit： Taiyuan University of Science and Technology Jinzhong University

KeyWords： forged 42CrMo steel high temperature compression deformation constitutive model activation energy flow stress

ClassificationCode：TG333

year,vol(issue):pagenumber：2021,46(11):260-269

Abstract：

The high temperature compression experiments of forged 42CrMo steel were conducted by thermal simulator Gleeble-3500D at the deformation temperatures of 1123, 1223 and 1323 K and the strain rates of 0.01, 0.1, 1 and 5 s-1, and the flow stress-strain curves were obtained. The experimental results show that the flow stress of material is simultaneously affected by strain, strain rate and deformation temperature. With the help of Arrhenius constitutive model, the influences of the strain, strain rate and deformation temperature on different material parameters of forged 42CrMo steel were considered, the effects of the strain, strain rate and deformation temperature were incorporated into the constitutive equation to establish a constitutive model of forged 42CrMo steel considering strain, strain rate and deformation temperature, and the traditional constitutive model was modified. Then, the applicability of the model was evaluated by comparative experiments and prediction of flow stress, and the values of R and ARRE are 0.9926 and 3.54%, respectively. Comparing the accuracy of the modified constitutive model with that of previous constitutive models, it is found that the accuracy of the modified constitutive model is higher obviously. It shows that the constitutive model considering strain, strain rate and deformation temperature can predict the flow stress of the material more accurately and comprehensively. Furthermore，the activation energy under different deformation conditions shows firstly decreases and then increases with the increasing of deformation temperature and firstly increases and then decreases with the increasing of strain rate. At the same time, the activation energy is affected by the coupled effect of strain and strain rate.

Funds：

国家自然科学基金资助项目（51875383，51575371）;山西省高校科技创新项目(2020L0579)

作者简介：陈园园（1983-），女，博士研究生，讲师，E-mail：123042922@qq.com；通信作者：齐会萍（1974-），女，博士，教授，E-mail：qhp9974@tyust.edu.cn

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