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FeS-MnS phase relationships in the presence of excess iron

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Abstract

The FeS-MnS system is reexamined, both with and without excess iron. When excess iron is present, as is true for sulfide inclusions within steel, the pseudobinary reveals a peritectic rather than the previously assumed eutectic invariant. The maximum solubility limits (997 ± 3°C, or 1270 K) in the two solid phases are: a) 7.5 wt pct MnS in FeS, and b) 73.5 wt pct FeS in MnS. The peritectic liquid contains 66 wt pct Fe, ∼34 wt pct S, and ∼0.4 wt pct Mn. The two solid sulfide phases are nearly stoichiometric in the presence of excess iron; the Fe-richer sulfide is metal-deficient in the absence of a metallic iron phase. Based on this study, it is possible to be more specific than heretofore about the Fe-FeS-MnS-Mn region of the Fe-Mn-S ternary. In addition to the presence of a peritectic, it was concluded that the miscibility gap does not cross the univariant line between primary metal and (Mn,Fe)S phases. The peritectic liquid and the Mn-richer solid sulfide equilibrate with a metal containing ≤ 0.36 wt pct Mn. These data help explain the Mn/s ratios required to avoid hot-shortness in regular and resulfurized plain-carbon steels.

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Authors and Affiliations

  1. Engineering Laboratories, AC Spark Plug Division, General Motors, 48556, Flint, MI

    G. S. Mann (Research Metallurgist)

  2. Department of Materials and Metallurgical Engineering, The University of Michigan, Ann Arbor, MI.

    L. H. Van Vlack (Professor)

Authors
  1. G. S. Mann
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  2. L. H. Van Vlack
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Additional information

G. S. MANN, formerly Graduate Student

This is a part of the dissertation submitted by G. S. Mann for his Ph.D. at the University of Michigan

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Mann, G.S., Van Vlack, L.H. FeS-MnS phase relationships in the presence of excess iron. Metall Trans B 7, 469–475 (1976). https://doi.org/10.1007/BF02652718

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  • DOI: https://doi.org/10.1007/BF02652718

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