Transactions of Materials and Heat Treatment

Title：Failure analysis and heat treatment process optimization of rotary flat binaural hot forging die for NOS525 steel

Authors： Han Baofeng1 Yan Chunlai2 Lu Haijian1 Huang Ting1 Yang Zhiyong2

Unit： 1. Baoji Bao De Li Electrification Equipment Co. Ltd. 2. School of Mechanical and Electronic Control Engineering Beijing Jiao Tong University

KeyWords： NOS525 steel hot forging die collapse and crack failure analysis heat treatment

ClassificationCode：TG315.2

year,vol(issue):pagenumber：2024,49(8):174-183

Abstract：

To solve the problem of collapse failure for a NOS525 steel rotary flat binaural hot forging die, the material composition, hardness, metallographic organization, tensile properties and impact mechanical properties of the taken specimens were studied by combining the failure forms and parts. At the same time, the forging process was simulated by software Deform-3D. Finally, the heat treatment process of the material was optimized by combining the failure forms and the causes of failure. The experimental and simulation results show that the composition of die material is abnormal, and there are quenching overheating and tempering insufficiency phenomena, resulting in coarse martensite and more austenite residue, which leads to insufficient strength, toughness and hardness of die material. In addition, the high stress and temperature concentration area of the die in the forging process coincides with the failure part of the die, which leads to premature collapse and cracking failure of the die surface,finally. Thus, after heat treatment optimization, the best heat treatment temperature are the quenching temperature of 1090 ℃, and three tempering temperatures of 560, 570 and 570 ℃, respectively, which improves the mechanical properties of the material,significantly.

Funds：

国家自然科学基金面上项目（52372345）

作者简介：韩宝峰（1980-），男，学士，教授级高级工程师 E-mail：44754743@qq.com 通信作者：杨智勇（1975-），男，博士，教授 E-mail：zhyyang@bjtu.edu.cn

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