On a New Method Based on X-Ray Diffraction to Identify Stress-Strain Laws on Surface-Treated Materials
A characterisation technique based on the stress determination by X-ray diffraction has been developed. It enables the identification of elastoplastic stress-strain laws on materials presenting an in-depth gradient of mechanical properties on its cross section. This technique is especially suitable to the characterisation of surfaces due to the small X-rays penetration depth. The method was applied in the characterisation of a carbonitrided and shot-peened steel, allowing to evaluate the stress-strain laws of the material at the surface, the intermediate layers and the bulk material. In addition, the in-depth evolution of microhardness, residual stresses, diffraction peak broadening and retained austenite contents were analysed. This allowed to understand the results of the proposed technique.
Paula Maria Vilarinho
A. C. Batista et al., "On a New Method Based on X-Ray Diffraction to Identify Stress-Strain Laws on Surface-Treated Materials", Materials Science Forum, Vols. 514-516, pp. 1623-1627, 2006