Transactions of Materials and Heat Treatment

Title：Surface integrity analysis and fretting fatigue prediction on titanium alloy by ultrasonic rolling

Authors： Huang Fang1 Ni Yongda2 Jin Zheliang1 Zhang Xuehui3

Unit： (1. School of Mechanical and Electrical Engineering Zhejiang Industry Polytechnic College Shaoxing 312000 China 2. School of Mathematical Sciences Tianjin University of Technology Tianjin 300387 China 3. School of Continuing Education Zhejiang Industry Polytechnic College Shaoxing 312000 China)

KeyWords： Ti6Al4V titanium alloy surface integrity fretting fatigue ultrasonic rolling crack initiation crack propagation

ClassificationCode：TH161

year,vol(issue):pagenumber：2024,49(5):142-151

Abstract：

In order to improve the surface performance and fretting fatigue resistance of Ti6Al4V titanium alloy, the ultrasonic rolling technology was used for its surface strengthening treatment, and the surface integrity and fretting fatigue crack initiation and propagation after ultrasonic surface rolling strengthening were studied by combining experiments and numerbycal analysis. Experimental research shows that ultrasonic surface rolling process can significantly reduce the surface roughness of Ti6Al4V titanium alloy, refine the microstructure with a gradient distribution along the depth direction, and introduce the compressive residual stress of -573 MPa and the work hardened layer with surface hardness of 447 HK and depth of 120 μm in the surface layer of the titanium alloy. Based on the surface integrity induced by ultrasonic surface rolling process, a finite element model of fretting fatigue for Ti6Al4V titanium alloy was established, and the crack initiation position is predicted by combining the maximum relative sliding amplitude, dissipated energy and equivalent damage stress model. The crack initiation direction is predicted by the maximum energy release rate criterion. Finally, based on joint simulation of ABAQUS and FRANC3D, the prediction on the fretting fatigue crack propagation is realized.

Funds：

基金项目:浙江省基础公益研究计划资助项目（LTGS23F030001)

作者简介：黄芳（1981-），女，硕士，副教授 E-mail：huangf2009@126.com

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