Transactions of Materials and Heat Treatment

Title：Deformation behavior at high temperature and establishment of constitutive model for die steel

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ClassificationCode：TG143.5；TG155.5

year,vol(issue):pagenumber：2023,48(9):220-229

Abstract：

An accurate material constitutive model is the foundation and key of finite element numerical modeling and simulation. Therefore, the thermal simulation experiments of 638 die steel were carried out under the conditions of strain rate of 0.001-10 s-1 and deformation temperature of 750-1150 ℃, and its stress-strain curves under different conditions were obtained to analysis its high temperature deformation behavior. The results show that the flow stress increases sharply with the increasing of strain, and then decreases slowly and finally tends to equilibrium after reaching the peack, which is the result of the combined effect of work hardening and dynamic softening of the material. After friction correction of the stress-strain curve, the constitutive models of 638 die steel are established based on the improved Johnson-Cook model and the strain-compensated Arrhenius model, respectively, and the average relative errors of the two are 8.03% and 7.66%, respectively. Considering the accuracy of the constructed constitutive model and the condition of high temperature and high strain rate in the actual laser heat treatment, it is recommended to use the Arrhenius constitutive model based on strain compensation.

Funds：

国家重点研发计划（2020YFB2010301）

作者简介：刘玉冰（1999-），女，硕士研究生 E-mail：202134178@mail.sdu.edu.cn 通信作者：管延锦（1969-），男，博士，教授 E-mail：guan_yanjin@sdu.edu.cn

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