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Thermodynamics of the fcc Fe-Mn-C and Fe-Si-C alloys

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Abstract

The activity of carbon in austenitic Fe-Mn-C and Fe-Si-C alloys has been studied by equilibration with controlled CH4-H2 atmospheres at temperatures in the range 848° to 1147°C and for composition up to about 60 pct Mn and 7 pct Si. The activity coefficient of carbon is diminished by manganese and is increased by silicon. Activity coefficients and derived values of the partial molar free energy, enthalpy, and entropy of solution of graphite in the alloy are expressed in mathematical form. The heat of solution of graphite, which is positive in the Fe-C binary alloys, decreases with increasing manganese and increases with increasing silicon concentrations. The partial molar entropy is independent of manganese, but is decreased by silicon.

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Authors and Affiliations

  1. Climax Molybdenum Co., Ann Arbor, Michigan

    Tsuguyasu Wada (Staff Metallurgist)

  2. University of Michigan, Ann Arbor

    Harue Wada (Research Assistant)

  3. Department of Metallurgy and Materials Science, MIT, Cambridge

    John F. Elliott (Fellow of The Metallurgical Society of AIME, Professor) & John Chipman (Fellow of The Metallurgical Society of AIME and of The American Society for Metals, 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, formerly of the Research Staff, MIT, Cambridge.

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Wada, T., Wada, H., Elliott, J.F. et al. Thermodynamics of the fcc Fe-Mn-C and Fe-Si-C alloys. Metall Trans 3, 1657–1662 (1972). https://doi.org/10.1007/BF02643059

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  • DOI: https://doi.org/10.1007/BF02643059

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