Journal
OPTICS AND LASERS IN ENGINEERING
Volume 52, Issue -, Pages 189-194Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2013.06.011
Keywords
Laser peening; Residual stress; Fatigue crack growth rate; Ti-6Al-4V titanium alloy; Coverage rate
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Funding
- National Natural Science Foundation of China [51175236]
- Research Fund for the Doctoral Program of Higher Education of China [20123227110022]
- Natural Science Foundation of Jiangsu Province [BK2010351]
- Key Laboratory Foundation of Photon Manufacturing Science and Technology of Jiangsu Province [GZ201107]
- Research Foundation for Advanced Talents of Jiangsu University
- PAPD of Jiangsu Higher Education Institutions
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The effects of laser peening (LP) with different laser peening coverage rates on residual stresses and fatigue crack growth (FCG) properties of Ti-6Al-4V titanium alloy were investigated. Residual stresses after LP and micro-structure with different fatigue striation patterns on fracture cross-sections were analyzed. Compressive residual stresses and dense dislocation arrangements can be obtained in the superficial layer after LP. The influence of compressive residual stresses induced under different LP coverage rates on FCC properties was revealed. LP coverage rate had an apparent influence on FCG properties as confirmed by the fatigue striation spacing on fracture cross-sections. Moreover, FCC rate decreased with the increase of compressive residual stresses perpendicular to the crack growth direction, which indicated that LP had an obvious inhibitory effects on FCG. (C) 2013 Elsevier Ltd. All rights reserved.
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