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

[Display omitted] •The fatigue life can be significantly improved (up to 9.3 times) by (LSP+SP).•Gradient microstructure with dislocations and novel CRS distribution can be induced.•Fatigue crack initiation can be hindered by the high-density dislocation layer.•Fatigue crack growth rate can be retar...

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Bibliographic Details
Published in:International journal of fatigue Vol. 153; p. 106465
Main Authors: Luo, Xuekun, Dang, Ning, Wang, Xin
Format: Journal Article
Language:English
Published: Kidlington Elsevier Ltd 01.12.2021
Elsevier BV
Subjects:
Compressive properties
Crack initiation
Crack propagation
Dislocation density
Fatigue failure
Fatigue life
Fractography
Fracture mechanics
Laser shock processing
Materials fatigue
Metal fatigue
Microstructure
Microstructures
Residual stress
Residual stresses
Shot peening
Surface treatments
Titanium alloys
Titanium base alloys
Surface treatments
Shot peening
Microstructures
Residual stresses
Fractography
ISSN:0142-1123, 1879-3452
Online Access:Get full text
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Summary:[Display omitted] •The fatigue life can be significantly improved (up to 9.3 times) by (LSP+SP).•Gradient microstructure with dislocations and novel CRS distribution can be induced.•Fatigue crack initiation can be hindered by the high-density dislocation layer.•Fatigue crack growth rate can be retarded by the dislocation proliferation layer. 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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ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2021.106465