| METALS AND METAL MATRIX COMPOSITES |
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| Effect of Shot Peening on Fatigue Stress Concentration Sensitivity of TB6 Titanium Alloy |
| LUO Xuekun1, ZHAO Chunling2, ZHA Xiaohui2, GUO Jing2, WANG Xin1, TANG ZhiHui1, YU Bo1
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1 Aviation Key Laboratory of Advanced Corrosion and Protection on Aviation Materials, Beijing Institute of Aeronautical Material, Beijing 100095, China
2 Hunan Aviation Powerplant Research Institute, Aero Engine Corporation of China, Zhuzhou 412002, China |
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Abstract The effect of shot peening on the fatigue performance of aviation TB6 titanium alloy specimens with high strength under stress concentration condition was investigated. The fatigue life/limits, fracture, tensile property and surface morphology were tested by the rotation bending fatigue tester, scanning electron microscopy, MTS tester, and white light interferometer. The results show that the fatigue limit of TB6 titanium alloy decreases from 537.5 MPa to 335.5 MPa as the increase of stress concentration ratio from Kt=1 to Kt=2. The alloy shows high fatigue stress concentration sensitivity. After shot peening, the fatigue limit of specimens with Kt=1 and Kt=2 increases by 33.5% and 22.2%, respectively. The notched sensitivity decreases by 48%. The shot peeing is beneficial to decreasing the fatigue stress concentration sensitivity of TB6 titanium alloy.
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Published: 01 July 2021
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| Fund:National Science and Technology Major Project (2017-Ⅶ-0001-0094, J2019-Ⅶ7-0015) and Independent Innovation Special Fund Project of AECC (CXPT-2018-029). |
| About author:: Xuekun Luo received his B.E. degree in materials of science and engineering from Central South University in Sep. 2005—Jun. 2009 and Ph.D degree in materials science from Beihang University in Sep. 2009—Jul. 2014. He is currently a senior engineer. He has published more than 10 journal papers, applied 23 natio-nal/national defense invention patents and 6 of them were authorized. He was the main co-author of 1 book and 2 national military standards. His research interests focus on the advanced mechanical surface processing technology, and the fundamental theory & application about surface integrity and fatigue behavior. His research was financially supported by the National Science and Technology Major Project, Civil Aircraft Research Program, Model Research Projects and Independent Innovation Special Fund Project of AECC. |
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2021, Vol. 35 
