Similar to sandblasting, except that it operates by the mechanism of plasticity rather than abrasion.
This process produces a static compressive strength in the surface and sub surface of the material which remains with the part during service. This compressive stress reduces the effect of any applied tensile stresses resulting in an increased tolerance to load with a resulting improvement in fatigue performance and predicted life.
Chrome and nickel plating of steel components can decrease the endurance limit by more than half, due to the creation of tensile residual stresses at the surface. Introducing a compressive residual stress prior to the plating process such as shot peening or nitriding can reduce the harmful effects of plating.
See also: Shot Blasting.
Subjects: Mechanical Engineering