Some Facts about Shot Peening
Shot Peening is a cold working process used to produce a compressive residual stress layer and modify mechanical properties of metals.
It entails impacting a surface with shot (round metallic, glass or ceramic particles) using sufficient force to create plastic deformation.
It is similar to sandblasting, except that it operates by the mechanism of plasticity rather than abrasion.
The compressive layer imparts greatly improved fatigue life and a resistance to stress corrosion cracking.