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Activity of carbon and solubility of carbides in the FCC Fe-Mo-C, Fe-Cr-C, and Fe-V-C alloys

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Abstract

The activity of carbon in austenitic Fe-Mo-C, Fe-Cr-C, and Fe-V-C alloys has been studied by equilibration with controlled CH4-H2 atmospheres at temperatures in the range 850° to 1200°C. The observations included a number of compositions in the two-phase fields, γ + carbide. Equations are given for the activity coefficient of carbon as a function of temperature and composition in the austenite field and from these the other thermodynamic properties of the solution may be computed as desired. The phase boundaries γ/γ + carbide were determined by breaks in the isoactivity lines. This was supplemented in the case of Fe-Mo-C alloys by metallographic linear analysis of equilibrated samples. The results confirm certain published phase diagrams and discredit others.

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Authors and Affiliations

  1. Climax Molybdenum Company, Ann Arbor, Mich.

    T. Wada (Staff Metallurgist)

  2. University of Michigan, Ann Arbor, Mich.

    H. Wada (Research Associate)

  3. Department of Metallurgy and Materials Science, Massachusetts Institute of Technology, USA

    J. F. Elliott (Fellow, TMS and Professor) & J. Chipman (Fellow, TMS and ASM, and Professor Emeritus)

Authors
  1. T. Wada
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  2. H. Wada
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  3. J. F. Elliott
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  4. J. Chipman
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Additional information

T. WADA, formerly with Research Staff, Massachusetts Institute of Technology, Cambridge, Mass. 02139

H. WADA, formerly with Research Staff, Massachusetts Institute of Technology

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Wada, T., Wada, H., Elliott, J.F. et al. Activity of carbon and solubility of carbides in the FCC Fe-Mo-C, Fe-Cr-C, and Fe-V-C alloys. Metall Trans 3, 2865–2872 (1972). https://doi.org/10.1007/BF02652854

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  • DOI: https://doi.org/10.1007/BF02652854

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