Abstract
Shot peening is a method that improves the mechanical properties of the surface due to the creation of severe plastic deformation, nanostructure, micro-strains, and grain refinement on the surface. In this study, the effect of shot peening parameters such as shot diameter, shot velocity, impinging angle, and time duration on residual stress and mechanical properties of Ti-6Al-4V surface was investigated using experimental tests, Taguchi test design method (L9 array), and signal-to-noise analysis. The results showed a 53 and 87 % increase in hardness of specimens with the minimum and maximum hardness and a 27 and 57 % increase in wear resistance of these specimens, respectively, compared to raw specimens, due to refinement and compression of the grains on the surface titanium alloy. Also, the shot impinging angle was a key factor in the shot peening process and affected 59, 64, and 67 % of residual stress, wear resistance, and surface hardness, respectively.

Key words
titanium alloy, shot peening, Taguchi method, microstructures, wear resistance, compressive residual stress

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