Abstract
Ti-6Al-4V alloys with equiaxed, martensitic and lamellar microstructures, respectively, were shot peened. Microstructure observation, phase analysis and surface residual stress measurement were conducted to investigate the microstructure influence on shot peening effects. The experimental results indicate that after shot peening microstructure of surface layer became fine and homogeneous for the as-received alloy which showed equiaxial microstructure. Cracks were found in the surface layer for the sample with acicular martensitic microstructure. And the sample with coarse lamellar structure transformed to equiaxed microstructure in the surface layer. Surface residual stress showed obvious difference. The samples with equiaxed microstructure achieved a compressive residual stress of 660 MPa, the ones with acicular martensitic microstructure achieved 366 MPa, and the ones with coarse lamellar microstructure showed a residual stress only 125 MPa.
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