Investigation on the residual stress and microstructure of (TiB + TiC)/Ti–6Al–4V composite after shot peening

Titanium matrix composites reinforced with TiB and TiC are fabricated by in situ technology. The distribution of residual stresses and microstructure are investigated after shot peening. The domain sizes and the microstrain of surface deformation layers are calculated from the full width at half maximum of Ti (2 1 3) peak. The results reveal that both compressive residual stresses and microhardness increase with the improvement of shot peening intensity in the surface deformation layers. And the domain sizes are refined and the microstrain become severely in surface layers after shot peening. In the progress of investigation, it is found that these variations are influenced by both the volume percentages of reinforcements and shot peening intensities. Comparing to the reinforcements, the effects of SP intensities were distinct and dominate.