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Liquidus Surface Projection of the Fe-Nb-C System in the Iron-Rich Corner

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Abstract

In the present study, the liquidus surface projection of the Fe-Nb-C system is proposed in the iron-rich corner using different techniques (differential thermal analysis (DTA), optical microscopy, scanning electron microscopy with energy dispersive X-ray analysis (EDX), and quantitative electron probe microanalysis (EPMA)). Thus, the primary crystallization phases, γ(Fe), δ(Fe), NbC1−x , and Fe2Nb, are identified. In addition, three invariant ternary reactions are proposed: two invariant eutectic ternary reactions: L ↔ δ(Fe) + Fe2Nb + NbC1−x and L ↔ γ(Fe) + NbC1−x  + Fe3C; and a quasi-peritectic reaction: L + δ(Fe) ↔ γ(Fe) + NbC1−x as well as the univariant reactions in solid phase. However, the univariant line separating the primary crystallization surfaces δ(Fe) and NbC1−x goes through a maximum; the temperature is estimated in this work at 1456 °C < T < 1457 °C.

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  1. JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.

  2. Cameca is a trademark of Cameca, Courbevoie, France.

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Acknowledgments

The authors express their gratitude to S. Hamar-Thibault (retired Chargée de Recherche) for her help with the microprobe analysis (Laboratoire de Thermodynamique et Physico-Chimie Métallurgiques ENSEEG, Domaine Universitaire, Saint-Martin- d’Hères Cedex, France) of some alloys.

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Authors and Affiliations

  1. Laboratoire d’Electrochimie-Corrosion, Métallurgie et Chimie Minérale, Faculté de Chimie, USTHB, B.P. 32, El Alia, Bab Ezzouar, Alger, Algérie

    Farida Haddad (Doctor), Sif Eddine Amara (Teacher-Researcher) & Rafika Kesri (Professor)

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  1. Farida Haddad
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  2. Sif Eddine Amara
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  3. Rafika Kesri
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Correspondence to Farida Haddad.

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Manuscript submitted October 7, 2007.

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Haddad, F., Amara, S.E. & Kesri, R. Liquidus Surface Projection of the Fe-Nb-C System in the Iron-Rich Corner. Metall Mater Trans A 39, 1026–1033 (2008). https://doi.org/10.1007/s11661-008-9483-8

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