Abstract
Shot peening is a surface treatment effective to obtain compressive residual stress on shot peened surface and to improve fatigue strength, and it is applied to automobile parts such as springs and gears. Based on recent trend for further reduction of automobile parts weight, higher hardness of automobile parts is required through various treatments such as carburizing. As hardness of shot peened surface is becoming higher, shot peening media with higher hardness is also desired. In this study, life properties of Fe-8Cr-6.5B gas atomized powder (FeCrB powder) with hardness of about 1200 HV and density of 7.4 Mg/m3 developed for shot peening media was examined. Weight loss of FeCrB powder after shot peening on gas carburized JIS SCM420 target for 24 h was approximately a quarter of that of the high speed steel powder. High hardness of FeCrB powder is thought to suppress deformation at collision to the target and to prevent crack initiation. Furthermore, hardness change during shot peening operation is smaller than that of high speed steel powder.
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