Influence Of Workpiece Conditions On Residual Stress Induced By Shot Peening

Author:  Ishikura, Kano, Kobayashi, Ujihashi, Okumura
Source:  Conf Proc: ICSP-10 Tokyo, Japan 2008
Doc ID:  2008076
Year of Publication:  2008
Abstract:  
ABSTRACT In recent years, higher energy shot peening treatment, which gives higher compressive residual stress has been strongly required to improve the fatigue strength of carburized gears. And the high hardness shot media has been developed for high-energy shot peening treatment. However, the influence of the hardness and microstructure of the carburized workpieces on the compressive residual stress induced by shot peening using high hardness shot media has not been studied enough. In this study, we investigated the influence of the case hardness on the maximum compressive residual stress induced by shot peening. As a result, the maximum compressive residual stress increased proportionally with the case hardness even when high hardness shot media is used for the shot peening treatment. The workpieces that are given more than 2000MPa compression residual stress has extremely higher fatigue strength than that applying the conventional heavy peening treatment. KEY WORDS Carburized steel, Residual stress, Hardness, Retained austenite, Fatigue strength