Abstract
The previous study of the phase relations (Part I) is now extended to the solid-liquid regions of Fe-Mn-S and Fe-Mn-S-O systems. The differential thermal analysis measurements made with 1 to 5 pet Mn-Fe alloys containing sulfur and oxygen substantiated the positions of the univariant curves in pet Mn vsT plots derived from other available data and theoretical considerations. It is found that if sufficient oxygen and sulfur are present in the Fe-Mn alloys, there may be a liquid oxysulfide phase present at temperatures above 900°C, depending on the manganese content. The higher the manganese content in solution, the higher is the temperature below which no liquid phase is present,e.g. for 10 ppm, 900°C and for 10 pet Mn, ∼1200°C. The formation of oxides, sulfides, and liquid oxysulfides in the interdendritic regions during solidification, as predicted from the phase relations in the Fe-Mn-S-O system, was verified by microscopic examination using scanning electron microscopy and metallographic techniques.
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