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High-Temperature Phases in the Fe–Mo–Cr–C System

  • PHYSICOCHEMICAL MATERIAL RESEARCH
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Powder Metallurgy and Metal Ceramics Aims and scope

Phase equilibria involving the stable high-temperature quaternary χFe,Cr,Mo,C phase were established in the Fe–Mo–Cr–C phase diagram. The arc-melted alloys were annealed at subsolidus temperatures for 52 h and then quenched in liquid gallium. The solidus temperature of the alloys was determined with the Pirani–Alterthum method. High-temperature X-ray diffractometry was employed to monitor the sequence of changes in the alloy phase composition from room temperature to the solidus temperature. The χ + η + α, χ + η, and χ + σ phase equilibria were directly observed at 973 K < T < 1373 K, 1273 K < T < 1530 K, and 1523 K < T < 1530 K, respectively, in the Fe52.5Mo23.5Cr18.7C5.3 (at.%) alloy. The χ + M23C6 + α and χ + σ phase equilibria were directly observed at 973 K ≤ T < 1523 K and 1473 K < T < 1525 K in the Fe55.5Mo11.8Cr28.2C4.5 (at.%) alloy. It was shown that the two-phase χ + σ equilibrium could be preceded by three-phase χ + η + σ equilibria or a single-phase χ Fe,Cr,Mo,C equilibrium region (for the Fe52.5Mo23.5Cr18.7C5.3 alloy in the 1523 K < T < 1530 K temperature range). The quaternary χ Fe,Cr,Mo,C phase was found in the (51.9–64.9) Fe, (5.4–23.5) Mo, (14.5–35.4) Cr, and (1–10.7) C at.% composition ranges. Primary crystallization regions of the σ Fe,Cr,Mo,C and αFe,Cr,Mo,C phases with solidus temperatures of approximately 1530 K (for the Fe52.5Mo23.5Cr18.7C5.3 alloy) and 1525 K (for the Fe55.5Mo11.8Cr28.2C4.5 alloy) were revealed. The linear thermal expansion coefficients for the χ Fe,Cr,Mo,C, η Fe,Cr,Mo,C, and αFe,Cr,Mo,C phases of different composition observed for different temperature ranges were determined.

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Acknowledgments

The authors are grateful to Professor M.V. Karpets for assisting in the high-temperature X-ray diffraction experiment.

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Authors and Affiliations

  1. Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    T. A. Velikanova

  2. Research Institute ‘Resurs’, State Reserve Agency of Ukraine, Kyiv, Ukraine

    A. M. Zaslavskii

  3. National Aviation University, Kyiv, Ukraine

    M. V. Kindrachuk

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  1. T. A. Velikanova
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  2. A. M. Zaslavskii
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  3. M. V. Kindrachuk
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Correspondence to T. A. Velikanova.

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Translated from Poroshkova Metallurgiya, Vol. 61, Nos. 9, 10 (547), pp. 155, 168, 2022

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Velikanova, T.A., Zaslavskii, A.M. & Kindrachuk, M.V. High-Temperature Phases in the Fe–Mo–Cr–C System. Powder Metall Met Ceram 61, 613–624 (2023). https://doi.org/10.1007/s11106-023-00350-z

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