Control of Peened Layer Development

Author:  Dr David Kirk, Visiting Prof in Materials, Faculty
Source:  The Shot Peener magazine, Vol 22, / Issue 3, Summer 2008
Doc ID:  2008021
Year of Publication:  2008
Abstract:  
Academic Study Dr. David Kirk INTRODUCTION The prime objective with shot peening is to induce a well-developed protective surface layer of plastically-deformed material. This layer has two important properties: compressive residual stress and work-hardening. Both of these properties act to improve service performance of components. Development of the layer proceeds with increase in amount of peening until it has stabilized in the required thickness range. Fig.1 represents, schematically, the development of a peened surface layer. Control is needed in order to ensure that the layer is fully-developed, has the required thickness and is not over-peened.