Abstract
Using direct and indirect equilibration methods, the solubilities of iron in molten bismuth and those of bismuth in molten iron‐carbon alloys have been measured over the temperature range 1473‐1873 K. The Henrian behaviour of bismuth in molten ferrous alloys allows the calculation of its activity coefficient, which in turn facilitates modelling as a function of temperature and carbon content, using the unified interaction parameter formalism developed by Pelton and Bale. The modelling results generate the expression: .A model has also been developed expressing bismuth content in molten iron‐carbon alloys as a function of temperature and composition: .
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