Investigation on Surface Layers Characteristics of Pre-Stressed Shot Peening Inconel 625

Abstract

Surface layers characteristics of pre-stressed shot peening Inconel 625 was investigated. Residual stress and microstructure in the deformation layers were characterized by X-Ray diffraction method.

The results showed that pre-stressed shot peening can further improve compressive residual stress and microstructure with the same intensity of traditional shot peening. Both surface compressive residual stress and maximum compressive residual stresses were produced in the deformation layers after various pre-stressed shot peening. The higher applied pre-stress resulted in more obvious effects of domain size refinement and micro strain generation.

Compressive residual stress, finer domains and higher micro strain strengthened the effects of pre-stressed shot peening, which caused the further increment of micro hardness and yield strength of Inconel 625.

Fig. 2 Compressive residual stress distribution of pre-stressed shot peening Inconel 625 in the deformation layers.