The Oxide Scales Formed on Different Co-Ni Based Superalloys During Isothermal Oxidation at 800 and 900°C

• Autorzy: Migas D. , Kierat M. , Moskal G.

Identyfikatory

DOI

10.24425/amm.2021.134752

• Języki publikacji: EN

Abstrakty

EN

In this investigation, the formation of oxide scales on different Co-Ni based superalloys of γ–γ′ type was analyzed. Co-20Ni-7Al-7W (at.%) alloy as well as its W-free modifications based on Co-Ni-Al-Mo-Nb and Co-Ni-Al-Ta systems was analyzed under conditions of high temperature oxidation at 800 and 900°C. Therefore, the alloys were isothermally oxidized at selected temperatures for 100 h in laboratory furnace. Afterwards, the oxidation products were evaluated by means of X-ray diffraction (XRD), optical microscopy (OM) and scanning electron microscopy (SEM). The performed tests showed that W-free alloys exhibit worse oxidation resistance compared to those of Co-Ni-Al-W alloys. After oxidation at 900°C, all alloys were prone of oxide spallation. The scales characterized by oxide peeling were mostly composed of complex Co-based oxides, including CoWO₄, CoTa₂O₆, Co₂Mo₃O₈, CoNb₂O₆.

Słowa kluczowe

EN

γ–γ′ cobalt-based superalloys; high temperature oxidation; Co-Ni superalloy; W-free cobalt superalloys

• 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: 2021
• Tom: Vol. 66, iss. 1
• Strony: 5--14
• Opis fizyczny: Bibliogr. 22 poz., fot., rys., tab.

Twórcy

autor

Migas D.

• Silesian University of Technology, Faculty of Materials Engineering, Department of Advanced Materials and Technologies, 8 Krasińskiego Str., 40-019 Katowice, Poland

autor

Kierat M.

• Silesian University of Technology, Faculty of Materials Engineering, Department of Advanced Materials and Technologies, 8 Krasińskiego Str., 40-019 Katowice, Poland

autor

Moskal G.

• Silesian University of Technology, Faculty of Materials Engineering, Department of Advanced Materials and Technologies, 8 Krasińskiego Str., 40-019 Katowice, Poland

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Uwagi

1. This work was supported by National Science Centre (Project 2018/29/N/ST8/02062). Publication was supported by the Rector’s Grant in the field of research and development, Silesian University of Technology, Grant Number 11/030/RGJ19/0234.

2. Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).