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Effect of the Carbon Content on the Structure and Mechanical Properties of a High-Temperature Carbide-Hardening Niobium–Molybdenum Alloy

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Abstract

The elemental, phase, and structural state of Nb–Mo–C alloys with equiatomic metal contents and 15, 20, 25, and 30 at % C are studied after electron-beam zone melting. In the alloy containing 15 at %, a fine microstructure, which is typical of eutectic alloys, forms; as the carbon content increases, primary carbide crystals appear in the alloy structure. The main carbide phase in all alloys is found to be an NbC-based carbide rather than an Nb2C-based carbide. The component distribution between the phases is studied as a function of the average alloy composition. The results of short-time strength tests of alloy specimens at room temperature and at 1500°C and also their high-temperature bending creep tests are presented. The 100-h creep strength maximum for the alloys is shown to be 200–300 MPa at 1500°C (\(\sigma _{{100}}^{{1500}}\) = 200–300 MPa).

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Funding

This work was supported by the Russian Foundation for Basic Research, project no. 19-02-00434.

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Authors and Affiliations

  1. Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, Russia

    I. B. Gnesin, M. I. Karpov, D. V. Prokhorov, B. A. Gnesin, T. S. Stroganova, I. S. Zheltyakova, V. I. Vnukov & E. I. Ryabenko

  2. All-Russia Research Institute of Aviation Materials, National Scientific Centre Kurchatov Institute, Moscow, Russia

    I. L. Svetlov

Authors
  1. I. B. Gnesin
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  2. M. I. Karpov
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  3. D. V. Prokhorov
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  4. B. A. Gnesin
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  5. T. S. Stroganova
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  6. I. S. Zheltyakova
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  7. V. I. Vnukov
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  8. E. I. Ryabenko
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  9. I. L. Svetlov
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Correspondence to I. B. Gnesin.

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Translated by Yu. Ryzhkov

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Gnesin, I.B., Karpov, M.I., Prokhorov, D.V. et al. Effect of the Carbon Content on the Structure and Mechanical Properties of a High-Temperature Carbide-Hardening Niobium–Molybdenum Alloy. Russ. Metall. 2022, 520–527 (2022). https://doi.org/10.1134/S0036029522050044

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