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Carburisation of ferritic Fe–Cr alloys by low carbon activity gases

Gheno, Thomas and Monceau, Daniel and Zhang, Jianqiang and Young, David Carburisation of ferritic Fe–Cr alloys by low carbon activity gases. (2011) Corrosion Science, vol. 53 (n° 9). pp. 2767-2777. ISSN 0010-938X

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Official URL: http://dx.doi.org/10.1016/j.corsci.2011.05.013

Abstract

Model Fe–Cr alloys were exposed to Ar–CO2–H2O gas mixtures at 650 and 800 °C. At equilibrium, these atmospheres are oxidising to the alloys, but decarburising (aC ≈ 10−15 to 10−13). In addition to developing external oxide scales, however, the alloys also carburised. Carbon supersaturation at the scale/alloy interface relative to the gas reflects local equilibrium: a low oxygen potential corresponds to a high pCO/pCO2 ratio, and hence to a high carbon activity. Interfacial carbon activities calculated on the basis of scale–alloy equilibrium are shown to be in good agreement with measured carburisation rates and precipitate volume fractions, providing support for the validity of the thermodynamic model.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Corrosion Science website: http://www.sciencedirect.com/science/article/pii/S0010938X11002356
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > University of New South Wales - UNSW (AUSTRALIA)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Laboratory name:
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Deposited By: Denis Faragou

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