Transactions of Materials and Heat Treatment

Title：High temperature rheology stress constitutive model of 55Q steel for light rail

Authors： Liu Yuhao1 Zhu Guoming1 Ping Yu2 Kuang Shuang2 An Huilong3

Unit： 1.University of Science and Technology Beijing 2.Technical Center Tangshan Iron & Steel Group Co. Ltd. 3.HBIS Group Technology Research Institute

KeyWords： 55Q steel rheology stress dynamic softening constitutive model prediction accuracy

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2024,49(3):219-229

Abstract：

The axial single-pass compression experiment of 55Q steel for light rail was conducted under the condition of the strain rate of 0.1-20 s-1 and the deformation temperature of 900-1200 ℃ by thermal simulation experiment machine Gleeble-3800. Then, the true stress-true strain curve of 55Q steel was obtained, and the influences of different hot working conditions on the rheology stress of 55Q steel for light rail were studied. The experiment results show that the rheology stress is lower under low strain rate at the same deformation temperature, and the rheology stress is lower at high temperature at the same strain rate, which indicates that low strain rate and high temperature are conducive to dynamic softening. The relationships between rheology stress, strain rate and deformation temperature were fitted linearly, and the modified Johnson-Cook constitutive model and the Arrhenius constitutive model based on strain compensation of 55Q steel were established. The two models were compared and analyzed. It is found that the Arrhenius constitutive model based on strain compensation has higher precision, which better reveals the thermal deformation characteristics of 55Q steel.

Funds：

国家重点研发计划（2021YFB3401000）；河钢集团重点科技项目（HG2021219）

作者简介：刘宇昊（1999-），男，硕士研究生，E-mail：lyh08082021@163.com；通信作者：朱国明（1974-），男，博士，教授，博士生导师，E-mail：zhuguoming@ustb.edu.cn

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