On the Carbon Solubility in Expanded Austenite and Formation of Hägg Carbide in AISI 316 Stainless Steel

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Abstract

The carbon solubility in expanded austenite is investigated by controlled low temperaturegaseous through-carburizing of AISI 316 stainless steel thin foils with thermogravimetry and synchrotron powder diffraction analysis. Carburizing is carried out in C2H2–H2–N2 and CO–H2–N2 atmospheres at 380–420 °C and 465–470 °C, respectively. Hägg carbide (x-M5C2)develops when the carbon content in the expanded austenite exceeds the metastable solubility limit; the transformation of carbon expanded austenite into Hägg carbide occurs irrespective of carburizing temperature in the investigated temperature range (380–470 °C). The maximum solubility of carbon in expanded austenite (380 °C) is found to correspond to an occupancy (yC) of 0.220 of the interstitial octahedral sites of the austenite lattice (i.e., 4.74wt%C). Decomposition of Hägg carbide into M7C3 occurs upon prolonged carburizing treatment orthermal exposure in inert atmosphere (in situ synchrotron experiments).
Original languageEnglish
JournalSteel Research International
Volume87
Issue number11
Pages (from-to)1395–1405
Number of pages11
ISSN1611-3683
DOIs
Publication statusPublished - 2016

Keywords

  • Carbon solubility
  • Expanded austenite
  • Thermogravimetry
  • Synchrotron diffraction
  • Hägg carbide

Cite this

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title = "On the Carbon Solubility in Expanded Austenite and Formation of H{\"a}gg Carbide in AISI 316 Stainless Steel",
abstract = "The carbon solubility in expanded austenite is investigated by controlled low temperaturegaseous through-carburizing of AISI 316 stainless steel thin foils with thermogravimetry and synchrotron powder diffraction analysis. Carburizing is carried out in C2H2–H2–N2 and CO–H2–N2 atmospheres at 380–420 °C and 465–470 °C, respectively. H{\"a}gg carbide (x-M5C2)develops when the carbon content in the expanded austenite exceeds the metastable solubility limit; the transformation of carbon expanded austenite into H{\"a}gg carbide occurs irrespective of carburizing temperature in the investigated temperature range (380–470 °C). The maximum solubility of carbon in expanded austenite (380 °C) is found to correspond to an occupancy (yC) of 0.220 of the interstitial octahedral sites of the austenite lattice (i.e., 4.74wt{\%}C). Decomposition of H{\"a}gg carbide into M7C3 occurs upon prolonged carburizing treatment orthermal exposure in inert atmosphere (in situ synchrotron experiments).",
keywords = "Carbon solubility, Expanded austenite, Thermogravimetry, Synchrotron diffraction, H{\"a}gg carbide",
author = "Christiansen, {Thomas Lundin} and Kenny St{\aa}hl and Bastian Brink and Somers, {Marcel A. J.}",
year = "2016",
doi = "10.1002/srin.201500415",
language = "English",
volume = "87",
pages = "1395–1405",
journal = "Steel Research International",
issn = "1611-3683",
publisher = "Wiley - V C H Verlag GmbH & Co. KGaA",
number = "11",

}

On the Carbon Solubility in Expanded Austenite and Formation of Hägg Carbide in AISI 316 Stainless Steel. / Christiansen, Thomas Lundin; Ståhl, Kenny; Brink, Bastian; Somers, Marcel A. J.

In: Steel Research International, Vol. 87, No. 11, 2016, p. 1395–1405.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - On the Carbon Solubility in Expanded Austenite and Formation of Hägg Carbide in AISI 316 Stainless Steel

AU - Christiansen, Thomas Lundin

AU - Ståhl, Kenny

AU - Brink, Bastian

AU - Somers, Marcel A. J.

PY - 2016

Y1 - 2016

N2 - The carbon solubility in expanded austenite is investigated by controlled low temperaturegaseous through-carburizing of AISI 316 stainless steel thin foils with thermogravimetry and synchrotron powder diffraction analysis. Carburizing is carried out in C2H2–H2–N2 and CO–H2–N2 atmospheres at 380–420 °C and 465–470 °C, respectively. Hägg carbide (x-M5C2)develops when the carbon content in the expanded austenite exceeds the metastable solubility limit; the transformation of carbon expanded austenite into Hägg carbide occurs irrespective of carburizing temperature in the investigated temperature range (380–470 °C). The maximum solubility of carbon in expanded austenite (380 °C) is found to correspond to an occupancy (yC) of 0.220 of the interstitial octahedral sites of the austenite lattice (i.e., 4.74wt%C). Decomposition of Hägg carbide into M7C3 occurs upon prolonged carburizing treatment orthermal exposure in inert atmosphere (in situ synchrotron experiments).

AB - The carbon solubility in expanded austenite is investigated by controlled low temperaturegaseous through-carburizing of AISI 316 stainless steel thin foils with thermogravimetry and synchrotron powder diffraction analysis. Carburizing is carried out in C2H2–H2–N2 and CO–H2–N2 atmospheres at 380–420 °C and 465–470 °C, respectively. Hägg carbide (x-M5C2)develops when the carbon content in the expanded austenite exceeds the metastable solubility limit; the transformation of carbon expanded austenite into Hägg carbide occurs irrespective of carburizing temperature in the investigated temperature range (380–470 °C). The maximum solubility of carbon in expanded austenite (380 °C) is found to correspond to an occupancy (yC) of 0.220 of the interstitial octahedral sites of the austenite lattice (i.e., 4.74wt%C). Decomposition of Hägg carbide into M7C3 occurs upon prolonged carburizing treatment orthermal exposure in inert atmosphere (in situ synchrotron experiments).

KW - Carbon solubility

KW - Expanded austenite

KW - Thermogravimetry

KW - Synchrotron diffraction

KW - Hägg carbide

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