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Development of a Technology of Production of a Hafnium–Nickel Master Alloy in a Vacuum Arc Furnace for the Alloying of Cast Nickel Superalloys

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Russian Metallurgy (Metally) Aims and scope

Abstract

A technology of producing a high-quality hafnium–nickel GfNi10 master alloy is developed: it is produced in a vacuum arc furnace with a nonconsumable electrode using a preliminary annealed pressed electrolytic hafnium powder. The total content of impurities and oxygen and nitrogen gases in the master alloy is found to be substantially lower than that in a serial GFN-10 master alloy. The character of interaction of the master alloy with the nickel melt during vacuum induction melting of the new VZhM200 cast nickel superalloy shows that, in contrast to a GFN-10 master alloy, the GfNi10 master alloy produced in VIAM gives no melt splashes during the introduction of the master alloy; this increases the assimilation of hafnium. The chemical composition and mechanical properties of a serial VKNA-1VR alloy and the new VZhL125 nickel superalloy melted with the developed master alloy correspond to the requirements of specifications for these alloys. In addition, high hafnium assimilation and low contents of gas impurities are ensured.

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ACKNOWLEDGMENTS

The study was performed using equipment available in the Collective Access Center for Climatic Tests in the National Research Centre Kurchatov Institute–VIAM.

Funding

The study was performed in terms of complex scientific direction 10 “Energy efficient, resource-saving, and additive production technologies of parts, semi-finished products, and constructions (Strategic directions for the development of materials and their recycling technologies for a period of to 2030)” [13].

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Authors and Affiliations

  1. All-Russia Scientific-Research Institute of Aviation Materials VIAM, National Research Centre Kurchatov Institute, 105005, Moscow, Russia

    P. G. Min, N. S. Pitelin & V. E. Vadeev

  2. Russian Technological University MIREA, 119571, Moscow, Russia

    N. S. Pitelin

Authors
  1. P. G. Min
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  2. N. S. Pitelin
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  3. V. E. Vadeev
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Correspondence to P. G. Min.

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Translated by N. Kolchugina

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Min, P.G., Pitelin, N.S. & Vadeev, V.E. Development of a Technology of Production of a Hafnium–Nickel Master Alloy in a Vacuum Arc Furnace for the Alloying of Cast Nickel Superalloys. Russ. Metall. 2023, 2022–2029 (2023). https://doi.org/10.1134/S0036029523700052

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