Shot peening of a sintered Ni-Cu-Mo steel produced by diffusion bonded powders

Abstract

The influence of the mechanical properties of a diffusion bonded Ni-Cu-Mo sintered steel on the residual stresses
and the plastic deformation promoted by both steel and ceramic shot peening was investigated. While steel shots
deform the surface more extensively than ceramic ones, leading to a thicker surface densification, ceramic shots
are more effective in terms of maximum compressive residual stresses. The increase in the yield strength of the
base material enhances residual stresses and reduces plastic deformation. The strain induced transformation of
Ni-rich austenite in martensite causes a slight decrease of tensile elongation and of impact energy in specimens
sintered at low temperature.