Effect of different surface asperities and surface hardness induced by shot-peening on the fretting wear behavior of Ti-6Al-4V

An experimental investigation on the fretting wear of Ti–6Al–4V was conducted using a self-designed test machine. The wear morphologies and the cracking phenomena of as-received and shot-peened specimens were comparatively analyzed by the combining the applications of a laser scanning confocal micro...

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Bibliographic Details
Published in:Surface & coatings technology 2018-09, Vol.349, p.1098-1106
Main Authors: Yang, Qi, Zhou, Wenlong, Niu, Zhiqiang, Zheng, Xiaobing, Wang, Qi, Fu, Xuesong, Chen, Guoqing, Li, Zhiqiang
Format: Article
Language:English
Subjects:
Asperity
Coefficient of friction
Curvature
Delamination
Fracture toughness
Fretting
Fretting wear
Friction
Morphology
Peeling
Polymethyl methacrylate
Shot peening
Surface delamination
Surface hardness
Surface layers
Thickness
Ti-6Al-4V
Titanium alloys
Titanium base alloys
Wear
Wear mechanisms
Wear rate
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Summary:An experimental investigation on the fretting wear of Ti–6Al–4V was conducted using a self-designed test machine. The wear morphologies and the cracking phenomena of as-received and shot-peened specimens were comparatively analyzed by the combining the applications of a laser scanning confocal microscope and a scanning electron microscope. The results showed that shot-peening exhibited an increase in the wear volume during the early fretting wear period, while it reduced the material loss in the long-term fretting wear process. The dominant wear mechanism was transformed from adhesion/peeling to delamination in both the as-received/shot-peened specimens. The wear rates under the peeling and delamination mechanism was explained by the equivalent friction coefficient of the contacting point and the thickness of cracked surface layer. The optimal strengthening effect was obtained under a moderate shot-peening intensity of 0.3 mmA, which produced a proper curvature radius of asperity and a good combination between hardness and toughness of the surface material. •A fretting test device is designed for the fretting wear experiments of Ti-6Al-4V.•Shot-peening leads to an increase of material loss in the early fretting stage.•Shot-peening reduces the fretting wear volume for the long-term fretting process.•The dominant wear mechanism is transformed during fretting process.•The optimal effect is obtained under a moderate shot-peening intensity.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2018.06.092