On the elusive crystal structure of expanded austenite

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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)

Cite this

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title = "On the elusive crystal structure of expanded austenite",
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.",
keywords = "Crystal structure, Expanded austenite, Nitriding, Plastic deformation, X-ray diffraction (XRD)",
author = "Bastian Brink and Kenny St{\aa}hl and Christiansen, {Thomas Lundin} and Jette Oddershede and Grethe Winther and Somers, {Marcel A. J.}",
year = "2017",
doi = "10.1016/j.scriptamat.2017.01.006",
language = "English",
volume = "131",
pages = "59--62",
journal = "Scripta Materialia",
issn = "1359-6462",
publisher = "Pergamon Press",

}

On the elusive crystal structure of expanded austenite. / Brink, Bastian; Ståhl, Kenny; Christiansen, Thomas Lundin; Oddershede, Jette; Winther, Grethe; Somers, Marcel A. J.

In: Scripta Materialia, Vol. 131, 2017, p. 59-62.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - On the elusive crystal structure of expanded austenite

AU - Brink, Bastian

AU - Ståhl, Kenny

AU - Christiansen, Thomas Lundin

AU - Oddershede, Jette

AU - Winther, Grethe

AU - Somers, Marcel A. J.

PY - 2017

Y1 - 2017

N2 - 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.

AB - 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.

KW - Crystal structure

KW - Expanded austenite

KW - Nitriding

KW - Plastic deformation

KW - X-ray diffraction (XRD)

U2 - 10.1016/j.scriptamat.2017.01.006

DO - 10.1016/j.scriptamat.2017.01.006

M3 - Journal article

VL - 131

SP - 59

EP - 62

JO - Scripta Materialia

JF - Scripta Materialia

SN - 1359-6462

ER -