Extended x-ray absorption fine structure investigation of annealed carbon expanded austenite

Jette Oddershede, Thomas L. Christiansen, Marcel A. J. Somers, Kenny Ståhl

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Carbon expanded austenite synthesized through carburizing of austenitic stainless steel powder at 380°C was annealed at 470°C and investigated with extended X-ray absorption fine structure (EXAFS) and synchrotron powder diffraction (SPD). SPD showed that the samples consisted of carbon expanded austenite and Hägg carbide, Ξ-M5C2. EXAFS showed that the Cr atoms were mainly present in environments similar to the carbides Hägg Ξ-M5C2 and M23C6. The environments of the Fe and Ni atoms were concluded to be largely metallic austenite. Light optical micrograph of stainless steel AISI 316 gas-carburized in a temperature regime around 470°C. The surface zone is converted into carbon expanded austenite; the high interstitial content of carbon dissolved in the surface results in highly favorable materials properties. In the present article the local atomic environment of (annealed) carbon expanded austenite was investigated with EXAFS. Copyright © 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
Original languageEnglish
JournalSteel Research International
Issue number2
Pages (from-to)162-168
Publication statusPublished - 2012


  • Absorption spectra
  • Annealing
  • Atoms
  • Austenitic stainless steel
  • Carbides
  • Carbon
  • Carburizing
  • Chromium
  • Diffraction
  • Extended X ray absorption fine structure spectroscopy
  • Materials properties
  • X rays
  • Austenite
  • Expanded austenite
  • Extended X-ray absorption fine structure
  • Hägg carbide
  • Synchrotron powder diffraction
  • AISI 316
  • Atomic environment
  • Cr atoms
  • Ni atoms
  • Optical micrographs
  • Surface zones
  • Temperature regimes


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