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Production of single-crystal seeds [001] from nickeltungsten alloys by directional crystallization
https://doi.org/10.22349/1994-6716-2021-106-2-55-65
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 hightemperature 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.
About the Authors
V. N. Toloraya
Federal state unitary enterprise All-Russian Scientific Research Institute of Aviation Materials
Россия
Россия
17 Radio St, 105005 Moscow
G. A. Ostroukhova
Federal state unitary enterprise All-Russian Scientific Research Institute of Aviation Materials
Россия
Россия
17 Radio St, 105005 Moscow
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Review
For citations:
Toloraya V.N., Ostroukhova G.A. Production of single-crystal seeds [001] from nickeltungsten alloys by directional crystallization. Voprosy Materialovedeniya. 2021;(2(106)):55-65. (In Russ.) https://doi.org/10.22349/1994-6716-2021-106-2-55-65
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