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The Fe-rich corner of the metastable C-Cr-Fe liquidus surface

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Abstract

The liquidus surface of the C-Cr-Fe system has been experimentally determined in the Fe-rich region —C ≤6 wt pct, Cr ≤40 wt pct —using a sensitive differential thermal analysis technique, along with optical and scanning electron microscopy and X-ray diffraction. Previous liquidus surfaces for this system have differed on the extent of the (Cr,Fe)23C6 liquidus field, with one version reporting its existence at ∼20 wt pet Cr, and others finding that it did not occur at Cr levels of less than ∼60 wt pct. The present investigation provides evidence in favor of the second contention, with the (Cr,Fe)23C6 field not being detected at Cr ≤40 wt pct. Changes are proposed to the accepted liquidus surface in respect of the compositions of the invariant reactions—L + αδFe ⇌γFe + (Cr,Fe)7C3 andL + (Cr,Fe)7C3 ⇌γFe + (Fe,Cr)3C —and of the monovariant eutectic valley—L⇌ γFe + (Cr,Fe)7C3.

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Authors and Affiliations

  1. Division of Manufacturing Technology, Adelaide Laboratory, CSIRO, Leeds Crescent, Woodville North, 5012, South Australia, Australia

    Warren R. Thorpe (Senior Research Scientist) & Bruno Chicco (Experimental Scientist)

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  1. Warren R. Thorpe
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  2. Bruno Chicco
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Thorpe, W.R., Chicco, B. The Fe-rich corner of the metastable C-Cr-Fe liquidus surface. Metall Trans A 16, 1541–1549 (1985). https://doi.org/10.1007/BF02663011

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