Transactions of Materials and Heat Treatment

Title：Prediction model of austenitic mixed grains in the whole forming process and its application in engineering

Authors： Fan Lulu Liu Xiaofei Zhai Yuewen Zhang Peng Mo Anjun

Unit： China Productivity Center for Machinery Beijing Research Institute of Mechanical & Electrical Technology Ltd. China National Erzhong Group Deyang Wanhang Die Forging Co. Ltd.

KeyWords： mixed grain austenite recrystallization grain size hammer forging die forging

ClassificationCode：TG111.7

year,vol(issue):pagenumber：2021,46(11):49-61

Abstract：

For the formation law and reason of austenite mixed grains phenomenon during the thermoforming process of materials, a prediction model of austenite mixed grains based on twelve microstructure variables was proposed, which described in detail the grain sizes and grain distribution state of the phase zone, and quantified the defect degree of austenite mixed grains in the materials. Then, the model predicted the evolution processes for grains in the materials under five micro-mechanisms of work hardening, dynamic recrystallization, sub-dynamic recrystallization, static recrystallization and static grain growth, and the sub-models of the five micro-mechanisms were automatically switched according to the macro and micro states. Furthermore, taking an aerospace 300M steel large forgings as an engineering application research object, through the secondary development, the prediction model was embedded in the forging simulation software to realize the austenite grains evolution simulation of the whole forming process under the two processes of hammer forging and die forging, and the reason and evolution law of the mixed grains phenomenon for forgings were revealed by tracking the changes of the macro and micro variables in the key areas inside the materials to provide an important basis for the optimization on the current forging process and the implementation of the subsequent heat treatment process.

Funds：

国家科技重大专项支持项目（2018ZX04044-001）

作者简介：樊璐璐（1989-）女，博士，在站博士后，E-mail：lulu_alisa_fan@163.com；通信作者：刘晓飞（1975-），男，学士，研究员，E-mail：liufly@sina.com

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