Improving impact wear resistance of Ti-6Al-4V alloy treated by laser shock peening
(1. Tribology Research Institute, Key Laboratory of Advanced Technologies of Materials of Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China;
2. Key Laboratory of Science and Technology on Plasma Dynamics, Air Force Engineering University, Xi’an 710038, China)
2. Key Laboratory of Science and Technology on Plasma Dynamics, Air Force Engineering University, Xi’an 710038, China)
Abstract: The effects of laser shock peening (LSP) on the impact wear behavior of Ti-6Al-4V alloys were investigated by a homemade impact wear test rig. The microstructure and mechanical properties of the peened samples were studied. During the impact wear test, the energy absorption, impact force, wear contact time and wear mechanism of all the test samples were investigated in terms of the influence of the impact kinetic energy. The results showed that microhardness, elastic modulus and residual compressive stress of the treated samples were markedly improved. The wear resistances of both treated samples were highly improved after LSP, and a higher pulse energy corresponded to a more obvious effect. Besides, the wear in all test samples involved a combination of abrasive and oxidation wear and fatigue spalling.
Key words: Ti-6Al-4V alloy; laser shock peening; impact wear; impact kinetic energy; wear mechanism