Abstract
Steel solidifies either by a primary precipitation of δ-Fe or by a primary precipitation of γ-Fe. In the former case the steel can either go through a peritectic reaction or a solid state transformation to form y-Fe during cooling. The influence of the rate of solidification and/or the transformation sequence on the sulfide precipitation in steels was studied in unidirectionally solidified Fe-Ni-S and Fe-Ni-Mn-S alloys. Nickel was used to govern the solidification sequence. It was shown that the solid state transformation could give rise to iron sulfide films according to a metatectic reaction. It was also shown that the peritectic reaction favored the formation of iron sulfide films. These films solidified at a very low temperature. During cooling the films contracted and small sulfide particles were formed. If the alloy contained manganese the composition of the films was changed during cooling from nearly pure iron sulfide to nearly pure manganese sulfide due to diffusion of manganese from the matrix.
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