Determination of stress profiles in expanded austenite by combining successive layer removal and GI-XRD

Abstract

The present work deals with the evaluation of the residual-stress profile in expandedaustenite by successive removal steps using GI-XRD. Preliminary results indicate stresses of several GPa's from 111 and 200 diffraction lines. These stresses appear largest for the 200 reflection. The strain-free lattice parameter decayed smoothly with depth, while for the compressive stress a maximum value is observed at some depth below the surface. Additionally a good agreement was found between the nitrogen profile determined with GDOES analysis and the strain-free lattice parameter from XRD. © (2014) Trans Tech Publications, Switzerland.