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Thermodynamics of the Fcc Fe−Ni−C and Ni−C alloys

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Abstract

The activity of carbon in the fcc solid solution of the Fe−Ni−C system has been measured at 800°, 1000°, and 1200°C by comparison with observed values in the Fe−C binary by equilibration with methane-hydrogen mixtures. Defining the lattice ratioz C≡n C/(n Fe+n Ni−n C), the activity coefficient ΨC≡a C/z C has been determined as a function of temperature and composition. At infinite dilution log ΨC goes through a maximum at about 70 pct Ni in agreement with Smith. The partial molar free energy of carbon in the dilute solution referred to graphite is not a linear function of the base alloy composition, but has a large deviation with maximum at about 60 pct Ni. Similar maxima occur in both ΔH °C and ΔS °C . Linear equations are derived for the activity coefficient of carbon in three composition ranges of Fe−Ni−C alloys; a simplified equation applicable to nickel steels is included. The solubility of graphite in nickel has been determined. The marked deviation from linearity is ascribed to the existence of iron atoms in two electronic states, γ1 and γ2 which differ in energy and are antiferromagnetic and ferromagnetic, respectively.

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Authors and Affiliations

  1. Research Laboratory, Climax-Molybdenum Co. of Michigan, Ann Arbor, Mich

    Tsuguyasu Wada & Harue Wada

  2. Department of Metallurgy and Materials Science, M.I.T., USA

    John F. Elliott (Fellow of the Metallurgical Society, Professor) & John Chipman (Fellow of the ASM, Professor Emeritus)

Authors
  1. Tsuguyasu Wada
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  2. Harue Wada
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  3. John F. Elliott
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  4. John Chipman
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Additional information

TSUGUYASU WADA, formerly of the Research Staff, Massachusetts Institute of Technology, Cambridge, Mass.

HARUE WADA was formerly of the Research Staff, M.I.T.

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Wada, T., Wada, H., Elliott, J.F. et al. Thermodynamics of the Fcc Fe−Ni−C and Ni−C alloys. Metall Trans 2, 2199–2208 (1971). https://doi.org/10.1007/BF02917551

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  • DOI: https://doi.org/10.1007/BF02917551

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