On the elusive crystal structure of expanded austenite

Bastian Brink, Kenny Ståhl, Thomas Lundin Christiansen, Jette Oddershede, Grethe Winther, Marcel A. J. Somers

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Abstract

No consistent structural description exists for expanded austenite that accurately accounts for the hkl-dependent peak shifts and broadening observed in diffraction experiments. The best available description for homogeneous samples is a face-centered cubic lattice with stacking faults. Here Debye simulations of stacking fault effects were compared to experimental data for macro-stress free homogeneous expanded austenite to show that a faulted structure cannot explain the observed peak displacement anomalies. Instead it is argued that the shifts are the combined result of elastic and plastic anisotropy leading to (strongly) non-linear hkl-dependent elastic behavior during composition-induced plastic deformation on synthesis of expanded austenite.
Original languageEnglish
JournalScripta Materialia
Volume131
Pages (from-to)59-62
ISSN1359-6462
DOIs
Publication statusPublished - 2017

Keywords

  • Crystal structure
  • Expanded austenite
  • Nitriding
  • Plastic deformation
  • X-ray diffraction (XRD)

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