On the determination of stress profiles in expanded austenite by grazing incidence X-ray diffraction and successive layer removal

Made available in DSpace on 2018-12-11T16:38:31Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-08-01 Surface layers of expanded austenite resulting from nitriding typically exhibit large gradients in residual stress and composition. Evaluation of residual-stress profiles is explored by means of grazing incidence X-ray diffraction (GI-XRD), probing shallow depths, combined with successive layer removal. Several factors complicating the stress determination are analysed and discussed: (1) ghost stresses arising from a small variation in the shallow information depths probed with GI-XRD, (2) selection of the grain interaction model used to calculate the X-ray elastic constants for conversion of lattice strains into residual stress and (3) the composition dependence of these elastic constants. Technical University of Denmark, Department of Mechanical Engineering, Produktionstorvet 425 Sao Paulo State University (UNESP) Sao Paulo State University (UNESP)