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Title of Journal: J of Materi Eng and Perform

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Abbravation: Journal of Materials Engineering and Performance

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Springer US

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DOI

10.1016/0196-9781(94)90113-9

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1544-1024

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Effects of Laser Shock Processing on Fatigue Crack

Authors: Shuai Huang Ying Zhu Wei Guo Peng Peng Hongchao Qiao Xungang Diao Paul K Chu
Publish Date: 2017/01/12
Volume: 26, Issue: 2, Pages: 813-821
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Abstract

The effects of laser shock processing LSP on the fatigue crack properties of Ti17 titanium alloy are investigated Surfaces on either side of a fatigue slot are subjected to LSP The residual stress of the irradiated surface is measured by xray diffraction measurement and fatigue crack growth testing of the treated and untreated specimens The fatigue fracture morphology and microstructure are examined by scanning electron microscopy and transmission electron microscopy Proliferation and tangles of dislocations occur in the Ti17 and the density of dislocation increases after the LSP treatment The fine spacing of the fatigue striations indicates that LSP produces residual compressive stress on the irradiated surfaces which can delay microcrack formation and expansion Consequently the fatigue propagation life of the specimen increases considerably after LSPThis work was supported by International Science and Technology Cooperation Program of China Grant No 2013DFR50590 National Natural Science Foundation of China No 51501219 Natural Science Foundation of Liaoning Province No 2015020115 and City University of Hong Kong Applied Research Grant ARG No 9667104

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