Transactions of Materials and Heat Treatment

Title：Hot forging process on superalloy GH4169 bolt

Authors： Fang Jun1 Wu Min1 Zhang Tao2 Zhang Shaohang2 Tao Yue1 Liu Jinlong1 Jin Kai3

Unit： 1. Anhui Tianhang Mechanical & Electrical Co. Ltd. 2.College of Mechanical and Electronic Engineering Nanjing University of Aeromautics and Astronautics 3. State-owned Wuhu Machinery Factory

KeyWords： superalloy GH4169 hot forging single-pass multi-pass forging pressure strain uniformity

ClassificationCode：

year,vol(issue):pagenumber：2022,47(3):8-22

Abstract：

The hot forging process of superalloy has the characteristics of thermal-mechanical coupling and multi-parameter interaction, and the distribution and evolution of temperature field and stress-strain field are complex. It is necessary to obtain optimal process parameters by numerical analysis before the test. Therefore, for superalloy GH4169 bolt, the single-pass and multi-pass hot forging processes of bolt were compared and analyzed, and the influence laws of process parameters such as initial hot forging temperature for head, pressing rate, friction coefficient, heat transfer coefficient and die pre-heating temperature on hot forging pressure and strain uniformity of forgings were studied. The results show that the target bolt part cannot be formed by the single-pass hot forging, and the multi-pass hot forging is required. The hot forging pressure decreases with the increasing of initial hot forging temperature for head and increases with the increasing of friction coefficient and pressing rate. The strain uniformity is better when the initial hot forging temperature of head is higher or the friction coefficient is smaller. Finally, the optimized process parameters of hot forging for superalloy GH4169 bolt were obtained, and the parts with excellent performance were obtained through hot forging test.

Funds：

江苏省自然科学基金资助项目（BK20170785）

作者简介：方军（1975-），男，学士，高级工程师 E-mail：fangjun1212@sohu.com 通信作者：张涛（1989-），男，博士，讲师 E-mail：297zhangtao@nuaa.edu.cn

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