锻压技术

轻轨用55Q钢的高温流变应力本构模型

英文标题：High temperature rheology stress constitutive model of 55Q steel for light rail

单位：1.北京科技大学 2.唐山钢铁集团有限责任公司技术中心 3.河钢集团钢研总院

分类号：TG142.1

出版年,卷(期):页码：2024,49(3):219-229

摘要：

通过Gleeble-3800热模拟实验机，在应变速率为0.1~20 s-1、变形温度为900~1200 ℃的条件下对轻轨用55Q钢进行轴向单道次压缩实验，得到55Q钢的真应力-真应变曲线，并分析研究了不同热加工条件对55Q钢高温流变应力的影响。实验结果表明：在相同变形温度下，低应变速率时的流变应力较低,在相同应变速率下，高温时的流变应力较低，说明低应变速率和高温有利于动态软化。对流变应力、应变速率和变形温度之间的关系进行线性拟合，建立了55Q钢的修正Johnson-Cook本构模型和基于应变补偿的Arrhenius本构模型,对比两种模型发现，基于应变补偿的Arrhenius本构模型的预测精度更高，能够较好地揭示55Q钢的热变形特性。

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.

基金项目：

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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