Abstract
In order to clarify the reactions between sulfide inclusion and matrix in rimmed steels at high temperatures, a synthetic sulfide slag was embeded into various Mn-Fe alloys and the solid state reactions between them were studied at 1 100°-1450°. Results obtained here are as follows. 1) Sulfide were formed in the alloys by sulfur transfer from slag to surrounding matrix. Manganese concentration in matrix decreased rapidly. The region of precipitation of sulfide particles widened with increases of time and temperature and with the decrease of initial manganese concentration in matrix. 2) Repeating solution and precipitation, sulfide precipitates coagulated to larger particles. As a result, there appeared a zone without precipitates in the neighborhood of the slag-metal interface. 3) The shapes and localities of precipitates were affected by oxygen concentration in alloy. When the oxygen concentration was very low, precipitates appeared at the grain boundaries. On the contrary, when the concentration was high, precipitates appeared at random and were accompanied with some oxides. 4) Silicon in alloy prevented a little the sulfur transfer and the precipitation of sulfide.
