Shot peening method
AssigneeSintokogio, Ltd.
InventorYuji Kobayashi
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Abstract
A shot peening method is disclosed. One method includes performing a first shot peening for applying residual stress to a surface of an object formed of a metal material at a first depth, and performing a second shot peening for applying residual stress to the surface of the object at a second depth deeper than the first depth after the first shot peening. The first shot peening is performed before the object is used at a high temperature and the second shot peening is performed after the object is used at the high temperature, and after a cracking caused by stress due to thermal expansion and contraction of crystal grains occurs in the object. The cracking being deeper than the first depth and shallower than the second depth.
Claims12
A shot peening method, the method comprising:
- performing a first shot peening for applying residual stress to a surface of an object formed of a metal material at a first depth;
- and
- performing a second shot peening for applying residual stress to the surface of the object at a second depth deeper than the first depth after the first shot peening,
- wherein the first shot peening is performed before the object is used at a high temperature and the second shot peening is performed after the object is used at the high temperature, and after a cracking caused by stress due to thermal expansion and contraction of crystal grains occurs in the object, and
- wherein the cracking being deeper than the first depth and shallower than the second depth.
Dependencies are inferred from the claim text.