The effect of laser shock peening, shot peening and their combination on the microstructure and fatigue properties of Ti-6Al-4V titanium alloy

被引：96
作者：
Luo, Xuekun [1 ]
Dang, Ning [2 ]
Wang, Xin [1 ]
机构：
[1] AECC Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China
[2] Northwestern Polytech Univ, Sch Aeronaut, Xian 710072, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2021年 / 153卷
关键词：
Surface treatments; Shot peening; Microstructures; Residual stresses; Fractography; FOREIGN-OBJECT DAMAGE; CRACK-GROWTH; MECHANICAL-PROPERTIES; ALUMINUM-ALLOY; INITIATION; STRENGTH; BEHAVIOR;
D O I：
10.1016/j.ijfatigue.2021.106465
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
In this work, the effect of a novel post process integrating laser shock peening (LSP) with shot peening (SP) on the fatigue property of Ti-6Al-4V titanium alloy is investigated. The fatigue life can be improved (up to 9.3 times) by this post-process. The compressive residual stress (CRS) distribution and dislocation-gradient microstructure obtained were found to be responsible for the improvement. The fatigue crack initiation was hindered by the high-density dislocation layer with high CRS value on the surface and maximum CRS in the sub-surface, while the crack propagation was retarded by the dislocation proliferation layer with large CRS gradient.
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页数：11
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