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

Cite this

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title = "On the determination of stress profiles in expanded austenite by grazing incidence X-ray diffraction and successive layer removal",
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.",
keywords = "Low temperature surface hardening, Gas nitriding, Expanded austenite, X-ray diffraction, Stress analysis",
author = "Fernandes, {Frederico Augusto Pires} and Christiansen, {Thomas L.} and Grethe Winther and Somers, {Marcel A. J.}",
year = "2015",
doi = "10.1016/j.actamat.2015.04.040",
language = "English",
volume = "94",
pages = "271--280",
journal = "Acta Materialia",
issn = "1359-6454",
publisher = "Pergamon Press",

}

On the determination of stress profiles in expanded austenite by grazing incidence X-ray diffraction and successive layer removal. / Fernandes, Frederico Augusto Pires; Christiansen, Thomas L.; Winther, Grethe; Somers, Marcel A. J.

In: Acta Materialia, Vol. 94, 2015, p. 271-280.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - On the determination of stress profiles in expanded austenite by grazing incidence X-ray diffraction and successive layer removal

AU - Fernandes, Frederico Augusto Pires

AU - Christiansen, Thomas L.

AU - Winther, Grethe

AU - Somers, Marcel A. J.

PY - 2015

Y1 - 2015

N2 - 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.

AB - 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.

KW - Low temperature surface hardening

KW - Gas nitriding

KW - Expanded austenite

KW - X-ray diffraction

KW - Stress analysis

U2 - 10.1016/j.actamat.2015.04.040

DO - 10.1016/j.actamat.2015.04.040

M3 - Journal article

VL - 94

SP - 271

EP - 280

JO - Acta Materialia

JF - Acta Materialia

SN - 1359-6454

ER -