Transactions of Materials and Heat Treatment

Title：Constitutive model of ascast 42CrMo steel based on strain compensation

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ClassificationCode：TG333

year,vol(issue):pagenumber：2021,46(5):246-252

Abstract：

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.

Funds：

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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