Transactions of Materials and Heat Treatment

Title：Dynamic recrystallization model and numerical simulation of 18CrNiMo7-6 gear steel

Authors： Xie Yikui1 2 Wang Zhongying1 2 Fu Jianxun2 Liu Hui3

Unit：（1. School of Materials Science and Engineering Shanghai University Shanghai 200444 China 2.East China Branch of CISRI Huai′an 223007 China 3.School of Materials and Chemical Engineering Anhui Jianzhu University Hefei 230601 China）

KeyWords： 18CrNiMo7-6 steel dynamic recrystallization grain size evolution single-pass compression test Deform-3D

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2024,49(9):195-201

Abstract：

The single-pass compression tests on 18CrNiMo7-6 gear steel were conducted by Gleeble-3500 thermal simulation machine to explore the dynamic recrystallization behavior and the evolution law of grain size of steel under different deformation temperatures and strain rates. Then, the dynamic recrystallization and grain size models were established and simulated by finite element software Deform-3D, and the complete recrystallization characteristics in the central region of the sample and its changing expansion trend with the temperature were revealed. The simulation results show that the central region of the specimen undergoes complete recrystallization and expands with the increasing of deformation temperature. Under low strain rate condition, the incomplete recrystallization area increases due to the lack of distortion energy and dislocation accumulation. The grain size decreases with the decreasing of deformation temperature, but it may lead to mixed crystal. At the same time, the grain sizes in the center and expansion regions are generally larger under low strain rate condition. With the increasing of deformation, the grain size shows opposite changing trends at both ends, and this mixed crystal phenomenon is particularly significant.

Funds：

基金项目:国家重点研发计划（2020YFB2008104）

作者简介：谢一夔(1992-)，男，博士研究生 E-mail：Asher_xykch@163.com 通信作者：王忠英(1967-)，男，博士，教授级高工 E-mail：13357968558@163.com

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