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

Frederico Augusto Pires Fernandes, Thomas L. Christiansen, Grethe Winther, Marcel A. J. Somers

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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.
Original languageEnglish
JournalActa Materialia
Volume94
Pages (from-to)271-280
ISSN1359-6454
DOIs
Publication statusPublished - 2015

Keywords

  • Low temperature surface hardening
  • Gas nitriding
  • Expanded austenite
  • X-ray diffraction
  • Stress analysis

Fingerprint Dive into the research topics of 'On the determination of stress profiles in expanded austenite by grazing incidence X-ray diffraction and successive layer removal'. Together they form a unique fingerprint.

Cite this