Morphology and microstructure of Yb₂O₃ layer formed over aluminide coating produced by pack cementation of Haynes® 263 alloy

• Autorzy: Morgiel Jerzy , Dudziak Tomasz , Rząd Ewa , Morgiel Krzysztof , Kateusz Filip

Identyfikatory

DOI

10.1007/s43452-024-00869-x

• Języki publikacji: EN

Abstrakty

EN

Intermetallic coatings from the Ni-Al system modified with rare earth elements (REE) additions are developed to protect the Ni-based superalloys against the increasingly demanding operating conditions, like those at ultra-supercritical (A-USC) power plants. The pack cementation process is generally limited to treatment of smaller parts, but simultaneously it allows to produce thick, well adhering and easily alloyed coatings. In this experiment, the Haynes® 263 alloy was subjected to pack cementation (PC) aluminizing process. The powder bed used in this experiment was prepared in two stages, i.e., first, the Al (8 wt.%), AlCl₃ (4 wt.%), and Al₂O₃ (88 wt.%) powders were thoroughly mixed and only then, the Yb (1.5 wt.% of the all former) was added. The coating obtained through this process was investigated using scanning and transmission electron microscopy (SEM/TEM) methods. It helped to prove that the diffusive layer consisted mostly of Al₁₄Cr₃Ni₂ ζ-phase, with significant amount of Al₁₃(Co, Cr)₄ and (Ni, Co, Cr)₃Al₄ larger precipitates as well as numerous smaller ones, composed of (Al, Ni, Co, Cr, Ti) or (Al, Ni, Co, Cr, Mo). The additive layer consisting of Al₃Ni₂ phase with up to 6 at. % Co and 2 at. % Cr was covered by a discontinuous layer of α-Al₂O₃ occasionally decorated with particles of the same phase. Only the very surface was found to be occupied by an amorphous Yb₂O₃ oxide, which formed a thin (~ 5 nm), but simultaneously a continuous layer. The latter finding is the first experimental documentation of the location of REE in the coating obtained through PC process using a powder bed modified with elements from that group.

Słowa kluczowe

EN

pack cementation coating; Al3Ni2; REE; rare earth elements; Yb2O3; TEM; HREM; EDS

PL

powłoka cementowa; Al3Ni2; REE; pierwiastki ziem rzadkich; Yb2O3; TEM; HREM; EDS

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2024
• Tom: Vol. 24, no. 2
• Strony: art. no. e59, 2024
• Opis fizyczny: Bibliogr. 30 poz., rys., tab., wykr.

Twórcy

autor

Morgiel Jerzy

• Institute of Metallurgy and Materials Science of Polish Academy of Sciences, 25 Reymonta st., 30‑059 Krakow, Poland

• https://orcid.org/0000-0003-1807-0149

autor

Dudziak Tomasz

• Lukasiewicz Research Network - Krakow Institute of Technology (KIT), Centre of Materials and Manufacturing Research, 73 Zakopiańska st., 30‑418 Krakow, Poland

autor

Rząd Ewa

• Lukasiewicz Research Network - Krakow Institute of Technology (KIT), Centre of Materials and Manufacturing Research, 73 Zakopiańska st., 30‑418 Krakow, Poland

autor

Morgiel Krzysztof

• Department of Casting, University of Science and Technology (AGH), 23 Reymonta st., 30‑059 Krakow, Poland

autor

Kateusz Filip

• Lukasiewicz Research Network - Krakow Institute of Technology (KIT), Centre of Materials and Manufacturing Research, 73 Zakopiańska st., 30‑418 Krakow, Poland

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025).