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Peening
Peening is the process of working a metal's surface to improve its material properties, usually by mechanical means such as hammer blows, by blasting with shot (shot peening), or blasts of light beams with laser peening. Peening is normally a cold work process (laser peening being a notable exception). It tends to expand the surface of the cold metal, thereby inducing compressive stresses or relieving tensile stresses already present. Peening can also encourage strain hardening of the surface metal.
==Residual stress==
Plastic deformation from peening induces a residual compressive stress in a peened surface, along with tensile stress in the interior. This stress state resembles the one seen in toughened glass, and is useful for similar reasons.
Surface compressive stresses confer resistance to metal fatigue and to some forms of corrosion, since cracks will not grow in a compressive environment. The benefit comes at the expense of higher tensile stresses deeper in the part. However, the fatigue properties of the part will be improved, since the stresses are normally significantly higher at the surface in part due to surface imperfections and damage.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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