Fernandes, Frederico Augusto Pires1; Christiansen, Thomas Lundin1; Somers, Marcel A. J.3
1 Department of Mechanical Engineering, Technical University of Denmark2 Materials and Surface Engineering, Department of Mechanical Engineering, Technical University of Denmark3 Centre for oil and gas – DTU, Center, Technical University of Denmark
The present work deals with the evaluation of the residual-stress profile in expanded-austenite 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.
Advanced Materials Research, 2014, Vol 996, p. 155-161
Expanded Austenite; Grazing Incidence; Stress Analysis; Gas Nitriding; X-Ray Diffraction (XRD); Low Temperature Surface Hardening
Main Research Area:
9th European Conference on Residual Stresses, 2014