Model for prediction of high temperature durability of castable nickel-base superalloys

Petrushin N.V., Elyutin E.S.
Petrushin N.V., Elyutin E.S. Model for prediction of high temperature durability of castable nickel-base superalloys // Proceedings of VIAM. 2021. No. 4. DOI: 10.18577/2307-6046-2021-0-4-16-31. URL: https://test.viam.ru/en/journal/2021/4/2
Keywords
castable nickel-base superalloys, durability in the long-term strength test, solidus temperature, lattice spacing
Abstract

The relationship between the long-term strength and the structural-phase and physico-chemical parameters of castable polycrystalline nickel-based superalloys is considered. A regression model for prediction of the durability at a temperature of 1100 °C and a stress of 80 MPa of the considered class of alloys is proposed. The model takes into account the amount of the γ'-phase, the γ'-solvus and solidus temperatures, γ/γ'-misfit, the lattice spacing of the γ- and γ'-phases, and the atomic mass of the alloy. The reliability of the durability prediction is confirmed by comparison with the experimental results on the long-term strength at temperatures 1000, 1050 and 1100 °C of a number of industrial and experimental castable polycrystalline nickel-based superalloys.

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