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Controlled shot peening and the related beneficial compressive residual stresses has long been a powerful weapon in the engineering designer’s armory in combating fatigue, stress corrosion, fretting and wear. As requirements for improved performance increase, surface engineering is becoming more important and the benefits of controlled shot peening are being incorporated into the design of components. In conjunction with controlled shot peening, isotropic finishing gives further life improvement to the already highly stressed parts. isotropic Finishing has been developing as a post shot peening treatment in situations where metal to metal contact occurs, and low friction is required: the combination of beneficial residual stress and roughness control are essential on modern applications to extend life and improve performance. It is not necessary to remove all of the witness of shot peening, but a percentage resulting in a matrix of load bearing smooth areas interspersed with valleys for oil pockets, reducing Ra values and providing a negative Rsk.

Optimizing roughness and residual stresses through controlled shot peening and isotropic finishing of surfaces