Structural instability of heat-resistant nickel-based superalloys with high content of the gamma prime phase obtained by selective laser melting method

Kablov E.N., Nerush S.V., Chubov D.G., Sukhov D.I., Filonova E.V., Pahomkin S.I.
UDC
669.245:621.791.724
DOI
10.18577/2307-6046-2025-0-8-3-13
Article PDF (Russian) (952.25 KB)
How to cite
Kablov E.N., Nerush S.V., Chubov D.G., Sukhov D.I., Filonova E.V., Pahomkin S.I. Structural instability of heat-resistant nickel-based superalloys with high content of the gamma prime phase obtained by selective laser melting method // Proceedings of VIAM. 2025. No. 8. DOI: 10.18577/2307-6046-2025-0-8-3-13. URL: https://test.viam.ru/en/journal/2025/8/1
Keywords
nickel-based superalloys, additive manufacturing, selective laser melting, built directional
Abstract

The study is devoted to the analysis of structural instability of heat-resistant nickel-based superalloys with a high content of γ′-phase (about 50 % and higher) obtained by selective laser melting (SLM). Two new alloy compositions differing only in Re and C content were used for the experiments. The results show that both alloys are crack-free after SLM, while exhibiting a pronounced cellular microstructure. In alloy 1, columnar grains with uniform distribution of  γ′-particles (150–250 nm) prevail, which provides structural stability, the proportion of γ′-phase in it is 48±2 %. Alloy 2, despite maintaining a high proportion of γ′-phase (55±3 %) after heat treatment, is prone to the formation of topologically closed packed phases due to segregation of Re and residual stresses. The different amount of γ′-phase in the alloys is explained by the difference in their chemical composition. Calculations of the lattice parameters revealed the dependence of the misfit of γ/γ′-phases on the composition: in sample 2 with lower misfit (0,29 %) the particles have morphology close to cubic, while in sample 1 (misfit 0,37 %) the particles are close to spherical. The morphology and misfit are related to the influence of Re. The anisotropy of the γ′-particle shape in the longitudinal section of sample 2 is related to the directional heat flux during SLM.

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