Transactions of Materials and Heat Treatment

Title：Dynamic recrystallization behavior of 40CrNi4Mo1V steel

Authors： Li Pengyang1 Li Shijie1 Liu Jiawei2 Zhou Leyu2 Jiang Bo1

Unit： 1.School of Materials Science and Engineering University of Science and Technology Beijing 2.China Academy of Machinery Beijing Research Institute of Mechanical & Electrical Technology Co. Ltd.

KeyWords： 40CrNi4Mo1V steel thermal compression test true stress-true strain curves activation energy of thermal deformation volume fraction of dynamic recrystallization

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2025,50(3):77-88

Abstract：

Thermal compression experiments were conducted on 40CrNi4Mo1V steel in extruded and electroslag states by using thermal simulation tester Gleeble-1500, and the true stress-true strain curves were measured. Then, the dynamic recrystallization behavior at the strain rates of 0.01-10 s-1,the temperatures of 1050-1250 ℃, and the reduction amount of 60% was systematically studied. Based on the modified Avrami equation, a dynamic recrystallization kinetics model was established. The results indicate that dynamic recrystallization phenomenon of the steel is significant under high temperature and low strain rate. Through linear regression calculation, the thermal deformation activation energy of the extruded and electroslag states are 511.11 and 493.35 kJ·mol-1, respectively. The fitting degree of the dynamic recrystallization volume fraction prediction model of 40CrNi4Mo1V steel in the extruded and electroslag states is 0.96 and 0.95, respectively, and the experimental value are in good agreement with the predicted values. Based on the model analysis, the optimized deformation temperature ranges of the two experimental steels at different strain rates are determined. By comparison, it is found that under the same deformation conditions, the electroslag steel is easier to trigger dynamic recrystallization due to its lower thermal deformation activation energy.

Funds：

国防基础科研计划（JCKY2022208A002）

作者简介：李鹏洋（2001-），男，硕士研究生 E-mail：lipengyang2023@163.com 通信作者：蒋波（1990-），男，博士，副教授 E-mail：jiangbo@ustb.edu.cn

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