Transactions of Materials and Heat Treatment

Title：Simulation and experiment study on cold heading for TB9 titanium alloy core rod

Authors： Tong Jinfang1 Feng Zhiguo1 2 Jiang Yulian1 Tao Liang1

Unit： 1.School of Mechanical Engineering Guizhou University 2.Guizhou Key Laboratory of Special Equipment and Manufacturing Technology Guizhou University

KeyWords： cold heading TB9 titanium alloy heading head of core rod shear zone microstructure properties

ClassificationCode：TG316.1

year,vol(issue):pagenumber：2023,48(8):32-40

Abstract：

For the existing problems in cold heading of TB9 titanium alloy core rod, the cold heading process of TB9 titanium alloy core rod was simulated and analyzed by finite element software DEFORM, and the influences of deformation amount and friction coefficient of multi-station cold heading on the quality of heading head of core rod were discussed. Then, the microstructure and mechanical properties of the shear zone for heading head of core rod were analyzed by experiment. The results show that the strain distribution for heading head of core rod is obtained by using different heading deformation amounts in the three-station heading of core rod, which effectively controls the heading defects caused by the high deformation in the center of heading head. The reduction of friction coefficient reduces the strain of heading head, when the deformation amount is 50%, the equivalent strain in the center part of heading head which is formed by three-station heading becomes 1.18874 with the friction coefficient of 0.35, the equivalent strain in the center part of heading head becomes 1.12713 with the friction coefficient of 0.25, and the equivalent strain in the center part of heading head becomes 1.07401 with the friction coefficient of 0.15, which improves the uniform deformation degree of heading head. Through the test and analysis on the heading head samples of core rod, it can be seen that there are no micro-holes, micro-cracks and other defects inside the heading head, and the microstructure in the shear zone formed inside the heading head is the densest and fibrous, and the average hardness in the shear zone is 354.8 HV, which is the hardest part for the heading head of core rod.

Funds：

国家自然科学基金资助项目（52165042）；贵州科学技术基金重点项目（黔科合基础[2020]1Z049）；贵州省优秀青年人才项目（黔科合平台人才[2021]5617号）；贵阳市科技人才培养项目（筑科合同[2021]43-1号）

作者简介：童晋方（1998-），男，硕士研究生,E-mail：2796147363@qq.com;通信作者：冯治国（1978-），男，博士，博士生导师，教授,E-mail：zgfeng@gzu.edu.en

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