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1 2015

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Modelling the Effects of Residual Stresses on Electro-Magnetic Properties of Super Alloys

Goetz S., Chandra D., Veselova D., Klocke F.

Journal of Machine Engineering

2015

Vol. 15, No. 3

33--40

Super Alloys, commonly used in safety-critical aerospace components, regularly impose problems when machined in drilling or milling processes, resulting in surface damages that facilitate cracks. Residual stresses are often induced to prevent crack mitigation, but national aviation agencies set high quality standards on them. Current methods are either destructive or impose safety risks for the employees. Eddy current methods, however, are fast and cheap non-destructive methods to receive information on metallic surfaces. They rely on electro-magnetic properties of the material. The influence of residual stresses on both permeability and conductivity are not yet fully understood. This article presents a simple model that describes the correlation between residual stresses and those aspects. At first, the dependency of permeability and conductivity on various metallurgical properties, such as grain size or orientation, is deduced. In a second step, the influence of residual stresses on these properties is shown. A third step combines both steps into a coherent and holistic model to describe the influence of residual stresses on the electro-magnetic properties of Super Alloys. This model will help establishing Eddy Current Testing in the product monitoring in the aerospace industry.