Influence of Alloying Elements on the Microstructure and Selected High-Temperature Properties of New Cobalt-Based L1₂-Reinforced Superalloys

• Autorzy: Kierat Milena , Moskal Grzegorz , Zieliński Adam , Jung Tymoteusz

Identyfikatory

DOI

10.24425/amm.2022.137782

• Języki publikacji: EN

Abstrakty

EN

The study investigated the primary structure of the new generation of superalloys based on Co-10Al-5Mo-2Nb and Co-20Ni-10Al-5Mo-2Nb cobalt. Research on a group of cobalt-based materials was initiated in 2006 by J. Sato [1]. These materials may replace nickel-based superalloys in the future due to their excellent properties at elevated temperatures relative to nickel-based superalloys. The primary microstructure characterisation of the Co-10Al-5Mo-2Nb and Co-20Ni-10Al-5Mo-2Nb alloy are the basic subject of this article. The Co-10Al-5Mo-2Nb and Co-20Ni-10Al-5Mo-2Nb alloy are tungsten free alloys of a new type with the final microstructure based on the Co-based solid solution L1₂ phase of the Co₃(Al,Mo,Nb) type as a strengthened structural element. The analysed alloys were investigated in an as-cast state after a vacuum casting process applied on graphite moulds. The primary microstructure of the alloys and the chemical constituent of dendritic and interdendritic areas were analysed using light, scanning electron and transmission microscopy. Currently, nickel-strengthened γ’ phase steels are still unrivalled in aerospace applications, however, cobalt based superalloys are a response to their existing limitations, which do not allow maintaining the current rate of development of aircraft engines.

Słowa kluczowe

EN

Co10Al5Mo2Nb; Co20Ni10Al5Mo2Nb; casting; primary microstructure; segregation; dendrites

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2022
• Tom: Vol. 67, iss. 2
• Strony: 495--500
• Opis fizyczny: Bibliogr. 13 poz., fot., rys., tab., wykr.

Twórcy

autor

Kierat Milena

• Silesian University of Technology, Institute of Materials Science, 8 Krasińskiego Str., 40-019 Katowice, Poland
• Łukasiewicz Research Network - Institute for Ferrous Metallurgy, K. Miarki 12-14, 44-100 Gliwice, Poland

• https://orcid.org/0000-0002-6288-197X

autor

Moskal Grzegorz

• Silesian University of Technology, Institute of Materials Science, 8 Krasińskiego Str., 40-019 Katowice, Poland
• Silesian University of Technology, University Zone of Material Innovation, 8 Krasińskiego Str., 40-019 Katowice, Poland

• https://orcid.org/0000-0001-7396-6568

autor

Zieliński Adam

• Łukasiewicz Research Network - Institute for Ferrous Metallurgy, K. Miarki 12-14, 44-100 Gliwice, Poland

• https://orcid.org/0000-0003-1205-5482

autor

Jung Tymoteusz

• Łukasiewicz Research Network - Institute for Ferrous Metallurgy, K. Miarki 12-14, 44-100 Gliwice, Poland

• https://orcid.org/0000-0002-1219-0329

Bibliografia

• [1] J. Sato, T. Omori., K. Oikawa, I. Ohnuma, R. Kainuma, K. Ishida, Cobalt-base high-temperature alloys, Science 312, 90-91 (2006).
• [2] B. Mikołowski, Stopy żaroodporne i żarowytrzymałe - nadstopy, Wydawnictwo AGH, Kraków 1997.
• [3] A. Hernas, Żarowytrzymałość stali i stopów, Wydawnictwo Politechniki Śląskiej, Gliwice, p. 15-20 (2000).
• [4] T.M. Pollock, S. Tin, Nickel-Based Superalloys for Advanced Turbine Engines: Chemistry, Microstructure and Properties, J. Propuls. Power 22, 2, 361-374 (2006).
• [5] D. Migas, A. Tomaszewska, T. Mikuszewski, G. Moskal, New generation of γ-γ’ cobalt-based superalloys, Rudy i Metale Nieżelazne Recykling 63 (8), 19-24 (2018).
• [6] M. Subhashish, R.I. Banerjee, Partitioning and Site Occupancy of Ta and Mo in Co base γ/γ′ alloys studied my atom probe tomography, Intermetallics 49, 138-142 (2014).
• [7] M. Subhashish, Y. Hui-Yu, N. Soumya, D. Dye, R. Banerjee, Solute partitioning and site preference in γ/γ′ cobalt- base alloys, Scripta Materialia 67 (10), 850-853 (2012).
• [8] T. Mikuszewski, A. Tomaszewska, G. Moskal, D. Migas, D. Niemiec, Characterisation of primary microstructure of γ-γʹ Co-Al-W cobalt-based superalloys, Inżynieria Materiałowa 5, 217-223 (2017).
• [9] M. Cecilla, B. Joaquin Hidalgo, EIS Study of the Electrochemical Behavior of the Co-Cr-Mo alloy in Borate solutions, Electrochemical Society 11 (21), 69-78 (2008).
• [10] Lee C.S., Precipitation-hardening characteristics of ternary cobalt-aluminum-X alloys, University of Arizona, 1971.
• [11] S.K. Makineni, A. Samanta, T. Rojhirunsakool, T. Alam, B. Nithin, A.K. Singh, R. Banerjee, K. Chattopadhyay, A new class of high strength high temperature cobalt based γ-γʹ Co-Mo-Al alloys stabilized with ta addition, Acta Materialia 97, 29-40 (2015).
• [12] S.K. Makineni, B. Nithin, K. Chattopadhyay, Synthesis of a new tungsten-free γ-γʹ cobalt-based superalloy by tuning alloying additions, Acta Materialia 85, 85-94 (2015).
• [13] A. Tomaszewska, T. Mikuszewski, G. Moskal, D. Migas, Primary microstructure, microsegregation and precipitates characterization of an as-cast new type γ-γ′ Co-Al-Mo-Nb cobalt-based superalloy, Journal of Alloys and Compounds 750, 741-749 (2018).

Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).