Transactions of Materials and Heat Treatment

Title：Research on flow stress and constitutive equation for GH4698 alloy

Authors： Li Zhonghao1 Huang Liang1 Ban Yijie1 Wen Dongxu1 Li Jianjun1 2 Jiang Qiao3 4 Yang Xiaoli3 4 Zhang Jian3 4 Zhang Zhicheng4

Unit： 1. Huazhong University of Science and Technology 2. Hubei Huangshi Mold Industrial Technology Research Institute 3. Daye Special Steel Co. Ltd. 4. Hubei Key Laboratory of High Quality Special Steel

KeyWords： GH4698 alloy hot deformation behavior constitutive models flow stress prediction accuracy

ClassificationCode：TG132.3

year,vol(issue):pagenumber：2024,49(3):207-218

Abstract：

The hot compression experiment of GH4698 alloy was carried out by thermal simulation machine Gleeble-3500, and the hot deformation behavior of GH4698 alloy was studied under the deformation temperature of 960-1160 ℃, the strain rate of 0.001-10 s-1 and the deformation degree of 50%. Then, based on the true stress-true strain data, phenomenological model and physical constitutive model were established to predict the flow behavior of alloy at high temperature. The results show that the flow stress of GH4698 alloy increases sharply at first and then becomes gentle gradually during the process of hot compression. The flow stress is negatively correlated with the deformation temperature and positively correlated with the strain rate. In the four constitutive models, the strain-compensated Arrhenius model has the highest prediction accuracy, and the improved Zerilli-Armstrong model has higher prediction accuracy than the modified Zerilli-Armstrong model.

Funds：

国家重点研发计划（2022YFB3706903，2022YFB3706901）；湖北省重点研发计划(2022BAA024)

作者简介：李中豪（1999-），男，硕士研究生，E-mail：M202171017@hust.edu.cn；通信作者：黄亮（1981-），男，博士，教授，E-mail：huangliang@hust.edu.cn

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