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

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.
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Thomas Gheno, Daniel Monceau, Jianqiang Zhang, David J. Young. Carburisation of ferritic Fe-Cr alloys by low carbon activity gases. Corrosion Science, Elsevier, 2011, vol. 53, pp. 2767-2777. ⟨10.1016/j.corsci.2011.05.013⟩. ⟨hal-00726316⟩

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