Transactions of Materials and Heat Treatment

Title：Research on fatigue properties for TC4 titanium alloy strengthened by slotted mandrel hole extrusion

Authors： Cao Yang1 2 Xiao Biao3 Liu Fei1 4 Wu Jie1 Miao Xiaopeng1 Xu Jiuhua2 Su Honghua2

Unit： 1. School of Mechanical and Aviation Manufacturing Engineering Anyang Institute of Technology Anyang 455000 China 2. Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China 3. Nanjing Chenguang Group Co. Ltd. Nanjing 210006 China 4. School of Mechatronics Engineering Henan University of Science and Technology Luoyang 471003 China

KeyWords： slotted mandrel hole extrusion strengthening TC4 titanium alloy residual stress fatigue performance relative extrusion amount

ClassificationCode：TG376.3

year,vol(issue):pagenumber：2025,50(6):108-119

Abstract：

In order to improve the fatigue performance of TC4 titanium alloy hole specimen, a three-dimensional finite element simulation model of slotted mandrel hole extrusion strengthening was established, slotted mandrel hole extrusion strengthening tests and fatigue performance tests were carried out, and the influences of relative expansion amount on the hole wall microstructure, stress and fatigue performance of specimen were studied. The research results show that the depth of plastic deformation layer and the residual compressive stress for specimen hole wall with a relative extrusion amount e of 3% are greater than those of the specimen with e of 2% and 0%. The plastic deformation increases the grain dislocation, and the residual compressive stress reduces the hole wall stress, causing the median fatigue life of the specimen with e of 3% to be greater than those of the specimen with e of 2% and 0%. The average fatigue fringe widths of the specimen with e of 0%, 2% and 3% are 1.2, 0.9 and 0.7 μm, and the median fatigue life of the specimen with e of 2% and 3% is 1.6 and 2.1 times that of the specimen with e of 0%.

Funds：

河南省高等学校重点科研项目（25A460025）；国家自然科学基金资助项目（52405446）；河南省重点研发与推广专项（科技公关)（242102221020）；江苏省精密与微细制造技术重点实验室开放基金项目（JSKL2223K01）；安阳工学院博士后科研启动基金项目（BHJ2025004）

作者简介：曹洋（1989-），男，博士，讲师,E-mail：caoyang@ayit.edu.cn;通信作者：刘飞（1989-），男，博士，讲师,E-mail：liufei07104517@163.com

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