Transactions of Materials and Heat Treatment

Title：In-situ experimental investigation on austenite grain evolution in Aermet100 steel during high temperature holding process

Authors： Jiang Qiao1 Zhao Mingjie2 Zhang Jian1 Su Yang2 Li Changmin2 Ban Yijie2 Zhao Junfei2 Huang Liang2 Sun Chaoyuan3 Li Pengchuan3 Li Jianjun2

Unit： 1. Daye Special Steel Co. Ltd. 2. State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology 3. China National Erzhong Group Deyang Wanhang Die Forging Co. Ltd.

KeyWords： ultra-high strength steel in-situ experiment heating rate grain evolution grain growth model

ClassificationCode：TG142.33

year,vol(issue):pagenumber：2023,48(8):261-267

Abstract：

The microstructure evolution of materials during the heating and holding process will affect the subsequent deformation process. Therefore, in order to realize the effective control of microstructure during the hot deformation process of material, the austenite grain evolution law of Aermet100 steel during the heating and holding process was studied in-situ by high temperature laser confocal equipment. The results show that the austenite grain size increases with the decreasing of heating rate and the increasing of holding temperature and the holding time. Compared with the heating rate and holding time, the holding temperature has a more significant effect on the austenite grain size. 1000 ℃ is the critical temperature for the austenite grain growth of Aermet100 steel. When the holding temperature is lower than 1000 ℃, the austenite grain size is smaller, and when the holding temperature is higher than 1000 ℃, the austenite grain size increases significantly. Based on the statistical grain size, two austenite grain growth models coupled with the effects of heating rate, holding temperature and holding time were proposed. The predicted values of the two models are in good agreement with the experimental values, which indicates that the two established grain growth models are reliable.

Funds：

湖北省重点研发计划（2022BAA024）

作者简介：蒋乔（1971-），男，学士，高级工程师,E-mail：369876197@qq.com;通信作者：黄亮（1981-），男，博士，教授,E-mail：huangliang@hust.edu.cn

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