The influence of compressive residual stress on metallurgical and mechanical properties of materials exposed to shot peening: a review

Abstract

ABSTRACT This study includes a detailed review of the effects of both conventional shot peening and severe shot peening processes, which produce nano-crystallized layers on different materials such as aluminum, titanium, stainless steel, iron, magnesium alloys, and nickel superalloys, as well as composites. The description of current developments highlights the most important properties of the main lightweight metals extensively utilised in the aerospace, automotive, and biomedical sectors. The formation of refined nano-crystallized surfaces occurs due to the creation of compressive residual stress and the occurrence of severe plastic deformation after the application of the shot peening method, improving the poor metallurgical characteristics and minimal values of mechanical parameters such as fatigue strength, damping, tensile strength, and microhardness.We discussed using a combination of peening methods (e.g. laser shock peening, dual shot peening and shot peening) on weldments. This approach results in optimised surface roughness, work hardening, and compressive residual stresses. This study includes a detailed explanation of the challenges involved, current applications, and the direction of future growth in fields such as additive manufacturing. Introduction of modern shot peening simulation tools that can predict in-depth microstructural changes is necessary.