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Study of the microstructure of a heat-resistant monocrystal alloy after high-temperature operation
https://doi.org/10.22349/1994-6716-2025-122-2-35-42
Abstract
The microstructure of the material of the first-stage working blade of the Siemens SGT-400 gas turbine made of a heat-resistant single-crystal alloy was investigated in the post-operational state (after working out the assigned resource of ~25,000 h). The structural and phase state of the heat-resistant single-crystal nickel-based alloy after full-scale operation under conditions of long-term exposure to a high-temperature gas flow and working loads was studied using electron microscopy, X-ray diffraction analysis and differential scanning calorimetry. The regularities of the high-temperature aging process were studied, manifested in the appearance of coarse porosity, precipitation of the lamellar γ’-phase and local fusion of γ’-phase cells in the axes of dendrites. The micro indentation method was used to study the microhardness in different zones and structural components of the material of the locking and feather parts of the blade.
Keywords
heat-resistant single-crystal alloy,
post-operational state,
microstructure,
dendritic structure,
intermetallic phase,
microhardness,
high-temperature aging
Supporting agencies: The work was carried out with the financial support of the State Assignment of the Institute of Applied Physics of the Russian Academy of Sciences for the implementation of fundamental scientific research for 2024– 2026, registration number of R&D 124031500079-2 (code FFUF-2024-0031).
About the Authors
I. N. Tsareva
Federal Research Center Institute of Applied Physics of the Russian Academy of Sciences (IMP RAS)
Russian Federation
Russian Federation
Cand Sc. (Phys-Math)
85 Belinsky St, 603024 Nizhny Novgorod
L. A. Krivina
Federal Research Center Institute of Applied Physics of the Russian Academy of Sciences (IMP RAS)
Russian Federation
Russian Federation
Cand Sc. (Eng)
85 Belinsky St, 603024 Nizhny Novgorod
O. B. Berdnik
Nizhny Novgorod State Technical University named after R.E. Alekseev (NSTU)
Russian Federation
Russian Federation
Cand Sc. (Eng)
24 Minina St, 603155 Nizhny Novgorod
E. N. Razov
Federal Research Center Institute of Applied Physics of the Russian Academy of Sciences (IMP RAS)
Russian Federation
Russian Federation
85 Belinsky St, 603024 Nizhny Novgorod
A. A. Moskvichev
Federal Research Center Institute of Applied Physics of the Russian Academy of Sciences (IMP RAS)
Russian Federation
Russian Federation
Cand Sc. (Eng)
85 Belinsky St, 603024 Nizhny Novgorod
References
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Review
For citations:
Tsareva I.N., Krivina L.A., Berdnik O.B., Razov E.N., Moskvichev A.A. Study of the microstructure of a heat-resistant monocrystal alloy after high-temperature operation. Voprosy Materialovedeniya. 2025;(2(122)):35-42. (In Russ.) https://doi.org/10.22349/1994-6716-2025-122-2-35-42
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