Fatigue crack growth in residual stress fields of laser shock peened Ti6Al4V titanium alloy

被引：62
|
作者：
Zhang, Hepeng [1 ,2 ]
Cai, Zhongyi [1 ]
Chi, Jiaxuan [1 ,2 ]
Sun, Rujian [3 ]
Che, Zhigang [3 ]
Zhang, Hongqiang [2 ]
Guo, Wei [2 ]
机构：
[1] Jilin Univ, Sch Mat Sci & Engn, 5988 Renmin St, Changchun 130025, Peoples R China
[2] Beihang Univ, Sch Mech Engn & Automat, Beijing 100191, Peoples R China
[3] AVIC Mfg Inst, Sci & Technol Power Beam Proc Lab, Beijing 100024, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2021年 / 887卷 / 887期
基金：
北京市自然科学基金; 中国国家自然科学基金;
关键词：
Laser shock peening; Fatigue crack growth; Residual stress; Spot geometry; Stress intensity factor; PROPAGATION BEHAVIOR; FRACTURE-TOUGHNESS; TI-6AL-4V; MICROSTRUCTURE;
D O I：
10.1016/j.jallcom.2021.161427
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
This study investigates fatigue crack growth behavior in residual stress fields induced by laser shock peening (LSP) and its effect on the fatigue life of Ti6Al4V titanium alloy. The two-dimensional residual stress distribution on the specimen surface prior to and post to fatigue crack growth tests was measured by X-ray diffraction. Laser peening with square spot and circular spot was performed on the fatigue specimens. The fatigue lives of LSPed specimens with square spot and circular spot were 1.68 and 2.38 times those of the unpeened specimens, respectively. The result showed that significant crack retardation was observed in specimens only at high compressive residual stresses levels, which was attributed to the reduction of local stress. The superposition principle combined with the weight function method was used to predict the fatigue crack growth rate in residual stress fields. (c) 2021 Elsevier B.V. All rights reserved.
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页数：12
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