Eng
Ukr
Rus
Print

2023 №02 (05) DOI of Article
10.37434/sem2023.02.06
2023 №02 (07)

Electrometallurgy Today 2023 #02
Electrometallurgy Today (Sovremennaya Elektrometallurgiya), 2023, #2, 41-45 pages

Investigations of the structural features of a high-temperature nickel alloy for gas turbine engine blades

Yu.G. Kvasnitska1, G.P. Myalnitsa2, K.G. Kvasnytska1, I.I. Maksyuta1, V.O. Noga1

1PTIMA of the NAS of Ukraine, Ukraine. 34/1 Acad. Vernadskyi Ave., 03142, Kyiv. E-mail: jul.kvasnitskaja@gmail.com
2SC SPCG «Zorya»-«Mashproekt». 42-A Bohoyavlenskyi Ave., 54018, Mykolayiv. E-mail: mialniza@gmail.com

Abstract
In order to improve the environmental safety of the process of producing castings of cooled turbine blades of a 25 MW power gas turbine engine, investigations were conducted to determine the infl uence of the new technology on structure formation and to ensure the required chemical and phase composition of the products. Blade castings were produced from high-temperature corrosion-resistant CM88Y alloy in vacuum-induction furnace UPPF3-M by investment casting. For environmental safety it was proposed to use an autoclave to remove the ceramic rod from the ingot inner cavity. The ceramic rods were produced by solid-phase sintering using Al2O3-based mixture. Such a technology of producing blade castings with inner channels allowed reducing by two orders of magnitude the time of such an important operation as rod removal. The macro- and microstructure of transverse metal samples cut out from the airfoil and tail parts of fi ve blades was studied. Their analysis after heat treatment showed that the size of carbides in the airfoil part is 10…30 μm, in the tail part it is 20…50 μm. Homogeneous precipitation of the strengthening γ′-phase and dissolution of a considerable portion of (γ-γ′)-eutectic was observed. Precipitates of γ′-phase are of a cubic form and are grouped in clusters. It is found that the macro-and microstructure of blades produced by the improved technology meets the requirements of the current standards. 15 Ref., 3 Tables, 3 Figures.
Keywords: high-temperature corrosion-resistant alloy; turbine blade; gas-turbine engine, macro- and microstructure, CM88Y alloy

Received 20.02.2023

References

1. Khalatov, A.A., Yushchenko, K.A., Isakov, B.V. et al. (2013) Gas turbine construction in Ukraine: State-of-theart and prospects of development. Visnyk NANU, 12, 40-49 [in Ukrainian]. https://doi.org/10.15407/visn2013.12.040
2. Coakley, J., Whittaker, M.T., Kolisnychenko, S. (2020) Nibased superalloys. Switzerland, Trans. Tech. Publ. Ltd. https://doi.org/10.4028/www.scientific.net/978-3-0357-3161-3
3. Sims, C.T., Stoloff, N.S., Hagel, W.C. (1987) Superalloys II: High-temperature materials for aerospace and industrial power. New York, John Wiley & Sons.
4. Rame, J., Caron, P., Locq, D. et al. (2020) Development of AGAT, a third-generation nickel-based superalloy for single crystal turbine blade applications. Superalloys, 31-40. https://doi.org/10.1007/978-3-030-51834-9_106
5. Swain, B., Mallick, P., Patel, S. et al. (2020) Failure analysis and materials development of gas turbine blades. Materials Today: Proceedings, 33(8), 5143-5146. https://doi.org/10.1016/j.matpr.2020.02.859
6. Balitskii, O.I., Kvasnytska, Y.H., Ivaskevych, L.M. et al. (2022) Fatigue fracture of the blades of gas turbine engine made of a new refractory nickel alloy. Materials Sci., 57(5), 475-483. https://doi.org/10.1007/s11003-022-00568-z
7. Glotka, A.A., Ol'shanetskii, V.E. (2022) Forecasting the properties of heat-resistant nickel alloys equiaxial crystallization. Archives of Metallurgy and Materials, 67(1), 51-56. https://doi.org/10.15588/1607-6885-2021-2-3
8. Balyts'kyi, O.I., Kvasnytska, Yu.H., Ivaskevych, L.M., Mialnitsa, H.P. (2018) Corrosion and hydrogen resistance of heatproof blade nickel-cobalt alloys. Materials Sci., 54(2), 289-294. https://doi.org/10.1007/s11003-018-0178-z
9. Balitskii, A.I., Kvasnitska, Y.H., Ivaskevich, L.M., Mialnitsa, H.P. (2018) Hydrogen and corrosion resistance of Ni-Co superalloys for gasturbine engines blades. Archives of Materials Sci. and Eng., 91(1), 5-14. https://doi.org/10.5604/01.3001.0012.1380
10. Wiechczynski, A., Lisiewicz, M., Kwasnicka, J., Kostrica, W. (2015) Method of the directional solidification of the castings of gas turbine blades and a device for producing the castings of gas turbine blades of the directional solidified and monocrystalline structure. Pat. Appl. Espacenet EP2921244A1.
11. Balitskii, A.I., Kvasnytska, Y.H., Ivaskevych, L.M. et al. (2023) Hydrogen and corrosion resistance of nickel superalloys for gas turbines, engines cooled blades. Energies, 16, 1170-1154. https://doi.org/10.3390/en16031154
12. Repyakh, S.I. (2006) Technological principles of investment casting. Lira LTD [in Russian].
13. Bratukhin, A.G., Yazov, G.K., Karasev, B.E. (1997) Modern technologies in production of gas turbine engines. Moscow, Mashinostroenie [in Russian].
14. Simanovsky, V.M. (2006) Technology and materials of molds and cores for producing of GTE cast blades. Metall i Litio Ukrainy, 6, 47-48 [in Russian].
15. (2016) Specification Z88YF1-S2 for supplying remelting stocks of alloy CM-88Y: Technical Specifications of «Zorya »-«Mashproek» GTRPC.

Advertising in this issue: