Influences of Mechanical Properties and Retained Austenite Content on Shot-peening Characteristics

Author:  Tsuji, Kobayashi, Ishikura, Inoue
Source:  Conf Proc 2011: ICSP-11 South Bend, IN USA (pgs. 159-164)
Doc ID:  2011026
Year of Publication:  2011
Abstract:  
Preface The shot-peening process is used for many parts to improve their fatigue strength. Some major applications of shot-peening include surface roughing, hardening and compressive residual stress application. Compressive residual stress is considered the most effective method for improving the fatigue strength and, the most important compressive residual stress is maximum compressive residual stress.1) and 2) The maximum compressive residual stress is, in general, limited by the yield stress of the shot-peened material. According to the studies made by Tange, et al., the maximum compressive residual stress applied to spring steels by shot-peening is reported to be about 50-60% of the yield stress.3) In case of materials containing much retained austenite such as carburized steels, however, their mechanical properties as well as the compressive residual stress caused by expansion of deformation-induced martensite should be considered. In this study, materials with different mechanical properties and retained austenite contents were used to determine the influences of mechanical properties and retained austenite content on shot-peening characteristics.