UDC
669.245.018.44:621.373.826
DOI
10.18577/2307-6046-2026-0-7-43-62
Article PDF (Russian) (1.74 MB)
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S.V. Nerush, D.G. Chubov, D.I. Sukhov, Yu.Yu. Kaplanskiy Relationship between microstructure, creep mechanisms and stress‑rupture strength of the VZhS1 and VZhS3 nickel‑based superalloys produced by selective laser melting // Proceedings of VIAM. 2026. No. 7. DOI: 10.18577/2307-6046-2026-0-7-43-62. URL: https://viam-works.ru/en/journal/2026/7/4

Relationship between microstructure, creep mechanisms and stress‑rupture strength of the VZhS1 and VZhS3 nickel‑based superalloys produced by selective laser melting

S.V. Nerush, D.G. Chubov, D.I. Sukhov, Yu.Yu. Kaplanskiy
Abstract

Isothermal creep tests in the range from 850 to 950 °C yielded a matrix stress exponent n = 6,24 and an effective activation energy Q ≈ 613 kJ/mol, indicating that creep is governed by dislocation mechanisms with a dominant contribution of dislocation climb past coherent γ′ precipitates. For the alloys developed, Q exceeds the nickel self-diffusion energy by 329 kJ/mol, which corresponds to the level of cast IN738LC. In terms of stress-rupture strength the VZhS1 alloy surpasses IN939, whereas at 1000 °C the highly alloyed VZhS3 alloy (σ100 ≈ 130 MPa) approaches cast VZhL12U (~140 MPa) and exceeds the superalloys currently used in additive manufacturing

Keywords
selective laser melting, nickel-based superalloys, creep, stress-rupture strength, activation energy, Larson–Miller parameter, γ′-phase, VZhS1, VZhS3
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