TY - JOUR

T1 - Extended x-ray absorption fine structure investigation of annealed carbon expanded austenite

A1 - Oddershede,Jette

A1 - Christiansen,Thomas L.

A1 - Somers,Marcel A. J.

A1 - Ståhl,Kenny

AU - Oddershede,Jette

AU - Christiansen,Thomas L.

AU - Somers,Marcel A. J.

AU - Ståhl,Kenny

PB - Verlag/Stahleisen GmbH

PY - 2012

Y1 - 2012

N2 - 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.

AB - 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.

KW - Absorption spectra

KW - Annealing

KW - Atoms

KW - Austenitic stainless steel

KW - Carbides

KW - Carbon

KW - Carburizing

KW - Chromium

KW - Diffraction

KW - Extended X ray absorption fine structure spectroscopy

KW - Materials properties

KW - X rays

KW - Austenite

KW - Carburizing

KW - Expanded austenite

KW - Extended X-ray absorption fine structure

KW - Hägg carbide

KW - Synchrotron powder diffraction

KW - AISI 316

KW - Atomic environment

KW - Cr atoms

KW - EXAFS

KW - Ni atoms

KW - Optical micrographs

KW - Surface zones

KW - Temperature regimes

U2 - 10.1002/srin.201100197

DO - 10.1002/srin.201100197

JO - Steel Research International

JF - Steel Research International

SN - 1611-3683

IS - 2

VL - 83

SP - 162

EP - 168

ER -