Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 24, Issue 3, Pages 690-696Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(14)63112-5
Keywords
Ti-6Al-4V alloy; wet shot peening; microstructure; residual stress; fatigue property
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Funding
- Program for New Century Excellent Talents in University, China [NCET-10-0278]
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Ti-6Al-4V alloy was processed by wet shot peening with ceramic beads. The effects of the shot peened intensity on the microstructure, surface morphology, and residual stress were investigated. A tensile-tensile fatigue test was performed and the fracture mechanism was proposed. The results demonstrate that the surface roughness after wet shot peening is obviously lower than that after dry shot peening. With the increase of the shot peened intensity, the depth of the residual stress layer increases to 250 mu m, and the maximum stress in this layer increases to -895 MPa. The fatigue strength also increases by 12.4% because of the wet shot peening treatment. The dislocation density of the surface layer is significantly enhanced after the wet shot peening with ceramic beads. The microstructure of the surface layer is obviously refined into ultra-fine grains.
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