Thermodynamic Properties of the MnS^|^ndash;CuS0.5 Binary System

Abstract

In order to discuss the formation of MnS-CuS0.5 inclusion in γ-Fe, the phase diagram of the MnS-CuS0.5 binary system has been determined by using a confocal scanning laser microscope (CSLM) and a chemical equilibration technique. In addition, the activities of MnS and CuS0.5 in the liquid phase at 1 473 K were investigated by chemical equilibration with molten Cu. The phase diagram of the binary system was found to be of a eutectic type with mutual solid solubility between MnS and CuS0.5. The activities of MnS and CuS0.5 showed positive deviation from the ideality. Finally, the solid steel composition equilibrated with the inclusion was estimated by using the determined thermodynamic properties.

Thermodynamic Properties of the FeS–MnS–CuS0.5 Ternary System at 1473 K

“…5) respectively. The interaction between Mn and Fe in molten Cu, and , were considered to be insignificant because the contents of Fe and Mn in molten Cu equilibrated with FeS-MnS-CuS0.5 melts are less than 0.69 mass% and 0.22 mass %, respectively.…”

“…5) In this work, the thermodynamic properties of the FeS-MnS-CuS 0.5 ternary system, including the FeS-CuS 0.5 binary system, at 1 473 K were investigated by measuring the phase relations as well as the activities of components. Moreover, the composition of solid steel equilibrated with the FeS-MnS-CuS 0.5 inclusion was estimated by using the determined thermodynamic properties.…”