文献类型：期刊文献

英文题名：Improvement of fatigue life of Ti-6Al-4V alloy by laser shock peening

作者：Zhang, X. C.[1];Zhang, Y. K.[2];Lu, J. Z.[2];Xuan, F. Z.[1];Wang, Z. D.[1];Tu, S. T.[1]

机构：[1]E China Univ Sci & Technol, Key Lab Safety Sci Pressurized Syst, MOE, Shanghai 200237, Peoples R China;[2]Jiangsu Univ, Sch Mech Engn, Zhenjiang 212013, Peoples R China

年份：2010

卷号：527

期号：15

起止页码：3411

外文期刊名：MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

收录：;EI(收录号：20101612855760);WOS:【SCI-EXPANDED(收录号:WOS:000277758000018)】；

基金：The authors are grateful for the support by National Natural Science Foundations of China (50735001, 50805047, 50905080) and Shanghai Leading academic discipline project (B503). The author X.C. Zhang is also grateful for the support by Shanghai Chenguang Planning Project (2008CG36) and Shanghai Rising-Star Program (08QA14023).

语种：英文

外文关键词：Laser shock peening; Multiple laser peening; Residual stress; Fatigue life; Fatigue strength

摘要：The aim of this paper was to address the effects of multiple laser peening and laser peening intensity used in laser shock peening (LSP) on the residual stress, micro-hardness and three-point bending fatigue performance of Ti-6Al-4V alloy. The multiple laser peening was accomplished by using the successive laser shocks at the same spot and the laser peening intensity was changed through changing the number of overlapped laser spots. The microstructure, which was characterized by highly tangled and dense dislocation arrangements due to high strain rate, can be found near the surface of the laser-peened specimen. By comparing with the as-received specimen, high micro-hardness and compressive residual stress were introduced at the surface of the laser-peened specimen. With increasing the number of overlapped laser spots, the fatigue life of the laser-peened specimen increased, reached a local maximum and then decreased. The specimen treated by using three overlapped laser spots exhibited the highest fatigue life. When the number of overlapped laser spots was kept to be three, the LSP treatments with one single laser shock and two successive laser shocks respectively provided a 22.2% and 41.7% increase in the fatigue strength as compared with the as-received specimens. (C) 2010 Elsevier B.V. All rights reserved.