Friction and wear on laser textured Ti6Al4V surface subjected to laser shock peening with contacting foil

•Micro-dimple surface was subjected to laser shock peening with contacting foil.•Enclosure of micro cracks on bottom of micro dimple is found.•MLST+HCLSP treated sample reveals improved friction and wear performance. The Ti6Al4V micro-dimple surfaces fabricated by a masked laser surface texturing (M...

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Bibliographic Details
Published in:Optics and laser technology 2018-07, Vol.103, p.142-150
Main Authors: Dai, F.Z., Geng, J., Tan, W.S., Ren, X.D., Lu, J.Z., Huang, Shu
Format: Article
Language:English
Subjects:
Compressive properties
Dimpling
Dry friction
Drying oils
Foils
Friction
Friction resistance
Laser beam texturing
Laser shock peening
Laser shock processing
Laser surface texturing
Lasers
Lubrication
Microhardness
Peening
Residual stress
Stress concentration
Stress distribution
Surface roughness
Texturing
Titanium base alloys
Wear
Wear resistance
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Summary:•Micro-dimple surface was subjected to laser shock peening with contacting foil.•Enclosure of micro cracks on bottom of micro dimple is found.•MLST+HCLSP treated sample reveals improved friction and wear performance. The Ti6Al4V micro-dimple surfaces fabricated by a masked laser surface texturing (MLST) technique within water were subjected to soft contact laser shock peening (SCLSP) and hard contact laser shock peening (HCLSP). The effects of these two LSP methods on topography, micro-hardness and residual stress distribution were studied. The friction and wear performance under dry friction and oil lubrication were also studied. The enclosure of micro cracks in the micro-dimple bottom was observed when treated by SCLSP and HCLSP. The dry friction and wear test showed that the MLST+HCLSP surfaces had the best wear resistance performance. In the oil lubricated friction test, the occurrence of the hydrodynamic lubrication effect occurred on the micro-dimple surfaces. The MLST+HCLSP exhibited the best friction and wear resistance performance. These were due to the micro-hardness increase, the producing of compressive residual stress and the surface roughness reduction of as treated surfaces.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2017.12.044