Precipitation of η-phase during heat treatment in Ni–Fe–Co–Nb–Ti alloy

Ovsepyan S.V., Akhmedzyanov M.V., Filonova E.V., Zaysev D.V.
UDC
621.763
DOI
10.18577/2307-6046-2023-0-4-3-13
Article PDF (Russian) (1.21 MB)
How to cite
Ovsepyan S.V., Akhmedzyanov M.V., Filonova E.V., Zaysev D.V. Precipitation of η-phase during heat treatment in Ni–Fe–Co–Nb–Ti alloy // Proceedings of VIAM. 2023. No. 4. DOI: 10.18577/2307-6046-2023-0-4-3-13. URL: https://test.viam.ru/en/journal/2023/4/1
Keywords
nickel-iron superalloy, heat treatment, microstructure, phase, lamellar particle, temperature–time–precipitation diagram
Abstract

The effect of annealing at the temperature of 800–1040 °С on the η-phase formation in the weldable wrought VZh176 alloy of the Ni–Fe–Co–Nb–Ti system, intended for use in gas turbine engines, has been investigated. It is shown that annealing leads to the precipitation of η-phase particles and change the shape and distribution: from short plates at the grain boundaries to the Widmanstatten structure. The dependence of the quantity of the phase on the duration of processing is established. The composition and crystallographic structure of the η-plates are determined by the methods of transmission electron and scanning microscopy, using the methods of backscattered electron diffraction and х-ray microanalysis. A diagram of the change of the η-phase from temperature and duration of treatment was built.

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