Abstract
The solubility of carbon in Fe-Mn-C melts is determined at 1530±10°C in the range of Mn=40%.By construction of the following electrode concentration cell, the electromotive force corresponding to the change in Mn and C in Fe-Mn-C melts up to 36% of Mn content was measured at about 1540°C.Fe, Mn, C|SiO2, CaO, MnO, Al2O3|Fe, Mn, (36%), Csat.From this experiment, it was shown that Fe-Mn melts obeyed the Raoult's law but showed a gradually negative deviation from that law on addition of C. The effect of C on the activity coefficient of Mn was discussed by using the interaction coefficient γ(C)Mn. In addition, the effect of Mn on the activity coefficient of C was also discussed.Comparing with data of Fe-Cr-C melts already reported, it was shown that the effect of Mn on the activity coefficient of C was about one third of that of Cr.Furthermore, values of the interaction parameter, ε(X)C, which showed the effect of a number of dissolved elements on the activity coefficient of C were obtained in Fe-X melts saturated wit carbon.
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