Analysis of shot peening residual stress distribution based on dislocation configuration

Abstract

The distribution profile of residual stress on the surface layer of shot-peened materials is often in a hook shape. We analysed the distribution characteristics of residual stress by detecting dislocation configurations. The position of maximum compressive residual stress (MCRS) shifts inward with an increase in shot peening strength. It was found that long-term orderly dislocation pile-up groups frequently appeared in the MCRS region. The location of MCRS is not necessarily related to maximum dislocation density. At low strength, both the maximum dislocation density and the MCRS are on the surface region. At high strength, the surface region structures are composed of sub-grains and dislocation cells. The position of maximum dislocation density is between the surface region and the MCRS.

Simulation and Experimental Investigation of Multi-Step Shot Peening for Surface Crack Repair in Aluminum Alloys

“…The foundation of shot peening repair technology lies in the application extension of shot peening strengthening technology. In order to thoroughly investigate the principles and influencing factors of shot peening repair technology, a mature understanding of shot peening strengthening technology is required [13][14][15]. Zhang Hongwei et al [16][17][18] developed finite element models for single and multiple projectiles in shot peening to study the simulation of surface strengthening in aluminum alloys.…”