INDUSTRIES

Shot Peening

Shot Peening Products

AMASTEEL ® - Cast Steel Abrasive
AMACAST ® - Stainless Steel Shot

Use of Shot Peening

Shot Peening is used to extend the life and increase the performance of the parts which are being peened.

Basics of Shot Peening

In the Shot Peening process, kinetic energy is imparted to shot (small spherical particles) by a centrifugal wheel or compressed air. The kinetic energy of the flying particle impacting against the part to be shot peened, causes elastic and plastic deformation of the part surface. The unrecovered compression of the part surface results in the beneficial residual compressive stresses remaining in the topmost surface layers of the part being peened and extending to some depth below the surface. Since all fatigue failures are caused by surface tensile stresses, the surface layer of the residual compressive stresses effectively delay the onset of fatigue failure the part. The magnitude of the residual compressive stresses produced by the shot peening is the result of many peening parameters.

Quality of Shot in Shot Peening

The quality of the shot used determines how efficient and effective the shot peening process is. It is at the instance of impact of the shot particle against the surface of the part that the quality and makeup of the shot particle must efficiently transmit this kinetic energy into the part surface to produce the beneficial residual compressive stresses. How efficiently this energy is used to do useful work is dependent on the following shot characteristics:
   1. Hardness
   2. Microstructure
   3. Physical Defects
   4. Chemical Analysis
   5. Size
   6. Durability
   7. Transmitted Energy