Effect of the Temperature of Pressure Welding of a Wrought EP975 Nickel Alloy and a Single-Crystal Intermetallic VKNA-25 Alloy on the Structure and Properties of the Welded Joints

This work is a continuation of the studies of the possibility of formation of a one-piece blisk unit for gas turbine engines by solid-phase pressure welding (PW) of a single-crystal [001] Ni 3 Al-based VKNA-type blade alloy with a wrought EP975 disk nickel superalloy. The influence of the PW tempera...

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Bibliographic Details
Published in:Russian metallurgy Metally 2020-07, Vol.2020 (7), p.752-759
Main Authors: Drozdov, A. A., Povarova, K. B., Valitov, V. A., Galieva, E. V., Arginbaeva, E. G., Bazyleva, O. A., Bulakhtina, M. A., Raevskikh, A. N.
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Crystal structure
Electron backscatter diffraction
Gamma phase
Gas turbine engines
Grain size
Materials Science
Mechanical properties
Metallic Materials
Nickel
Nickel aluminides
Nickel base alloys
Pressure welding
Room temperature
Single crystals
Solid phases
Strain
Superalloys
Tensile tests
Welded joints
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Summary:This work is a continuation of the studies of the possibility of formation of a one-piece blisk unit for gas turbine engines by solid-phase pressure welding (PW) of a single-crystal [001] Ni 3 Al-based VKNA-type blade alloy with a wrought EP975 disk nickel superalloy. The influence of the PW temperature at a strain of 10 and 24% on the structure and mechanical properties of welded specimens at room temperature is investigated. An increase in the process temperature by 50°C to 1175°C is shown not to change the structure of the VKNA-25 alloy, and the γ-phase grain sizes in the EP975 alloy increase from 7–8 to 15–18 μm. During tensile tests, the welded specimens fail through the VKNA-25 alloy, and the strength of the welded specimens fabricated at 1175°C is almost twice as high as that of the specimens fabricated by PW at 1125°C at the same strain of the EP975 alloy. Electron backscatter diffraction (EBSD) analysis of the solid-phase bonding zone demonstrates that the VKNA-25 alloy retains its single-crystal structure.
ISSN:0036-0295
1555-6255
1531-8648
DOI:10.1134/S003602952007006X