Shot-Peening Process

Author:  Yuji Kobayashi
Source:  US 2009/0100658A1
Doc ID:  2009022
Year of Publication:  2009
Abstract:  
ABSTRACT A method of shot peening in which with respect to a carburized and quenched metal part, only its surface abnormal layer detrimental to the fatigue strength thereof is scraped without scraping of the martensitic structure underlying the surface abnormal layer, namely, in which the fatigue strength can be rendered stable and enhanced without surface cracking. As bombardment shot, use is made ofa shot with hardness higher than that (first hardness) ofthe surface abnormal layer occurring at a surface layer portion of metal part prior to shot peening but lower than that (second hardness) ofthe martensitic structure.