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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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