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Production of Single-Crystal Seeds [001] from Nickel–Tungsten Alloys by Directional Crystallization

  • METAL SCIENCE. METALLURGY
  • Published:
Inorganic Materials: Applied Research Aims and scope

Abstract

The problem of obtaining priming materials from Ni–W alloys arose in connection with the development of technology for casting single-crystal turbine blades of gas turbine engines (GTE) from high-temperature alloys. This technology uses a seed method for producing single-crystal castings with a crystallographic orientation [001] using seedings from alloys of the Ni–W system with a melting point 120–140°C higher than the casting alloy. The use of such primers greatly simplifies the casting process of turbine blades with a single-crystal structure, increases its reliability both in pass-through furnaces of the PMP-2 type and in high-gradient furnaces of the UVNK-9A type. The article presents the results of the study of the influence of temperature–velocity parameters of directional crystallization, namely, the temperature gradient GZ on the structure of the obtained single-crystal seed blanks, as well as the study of effects of tungsten and carbon on the structure of single-crystal seed blanks, and makes recommendations for optimizing the technological process of single-crystal casting of Ni–W seed blanks adjusting the alloy composition for the seed blanks.

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  1. All-Russian Scientific Research Institute of Aviation Materials, 105005, Moscow, Russia

    V. N. Toloraya & G. A. Ostroukhova

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  1. V. N. Toloraya
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  2. G. A. Ostroukhova
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Correspondence to V. N. Toloraya.

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Translated by Sh. Galyaltdinov

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Toloraya, V.N., Ostroukhova, G.A. Production of Single-Crystal Seeds [001] from Nickel–Tungsten Alloys by Directional Crystallization. Inorg. Mater. Appl. Res. 13, 1469–1476 (2022). https://doi.org/10.1134/S2075113322060272

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