Abstract
The activity of carbon in liquid iron has been determined at low concentrations by means of the CO-CO2 equilibrium and at high concentrations by the solubility of graphite. At intermediate concentrations there is a broad region in which measurements have not been made because of thermal instability of gas mixtures high in CO. Because of this phenomenon it is suggested that the reported activity coefficients at low concentrations may be in error and are only useful in determining a limiting value at infinite dilution. At temperatures below the melting point of iron, activity coefficients at intermediate concentrations along the liquidus line are calculated from recent measurements of the activity in austenite and of the solidus and liquidus lines of the phase diagram. The results agree fairly well with the data of Richardson and Dennis at higher temperatures. Several interpolation formulae are investigated. Equations are presented which describe the thermodynamic properties of the binary liquid solution at all compositions between the eutectic and 1760°C.
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References
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Chipman, J. Thermodynamics of liquid Fe-C solutions. Metall Trans 1, 2163–2168 (1970). https://doi.org/10.1007/BF02643430
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DOI: https://doi.org/10.1007/BF02643430