From Conventional Shot Peening to Severe Shot Peening as a Novel Surface Grain Refinement Method

As a mechanical surface treatment shot peening process is widely used in industry for last five decade. By multiplying the kinetic energy of shot impacts with special combinations of peening parameters is called as Severe Shot Peening (SSP). Recently, SSP processes are also used as a severe plastic deformation method for achieving superior surface properties of peened materials rather than Conventional shot peening. Many type of metallic and ceramic materials may be shot peened. Shot peening affects fatigue properties, corrosion fatigue, stress corrosion cracking, fretting galling and erosion in peened materails. It has been possible to obtain ultrafine and/or nanostructures on or under the surface with SSP.