Effect of Rare Earth Cerium Addition on Oxidation Behavior of Co-Al-W Alloys at 800°C
The γ/γ′ Co-based alloys are a new class of cobalt superalloys, which are characterized by remarkable high temperature strength owing to strengthening by γ′-Co3(Al, X) phases. In this investigation, the effect of cerium addition on oxidation behavior of model Co-Al-W alloys was studied. The introduc...
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| Language: | English |
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Polish Academy of Sciences
2022-02-01
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| Series: | Archives of Metallurgy and Materials |
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| Online Access: | https://journals.pan.pl/Content/122524/PDF/AMM-2022-1-25-Migas.pdf |
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| author | D. Migas T. Liptáková G. Moskal |
| author_facet | D. Migas T. Liptáková G. Moskal |
| author_sort | D. Migas |
| collection | DOAJ |
| description | The γ/γ′ Co-based alloys are a new class of cobalt superalloys, which are characterized by remarkable high temperature strength owing to strengthening by γ′-Co3(Al, X) phases. In this investigation, the effect of cerium addition on oxidation behavior of model Co-Al-W alloys was studied. The introduction of Ce aimed at improvement of the oxidation resistance of γ′-forming Co-based superalloys. The minor additions of cerium (0.1, 0.5 at.%) were added to the base alloy Co-9Al-9W. The alloys were prepared via induction vacuum melting (VIM). Further, a primary microstructure of the alloys was analyzed with particular regard to a segregation of Ce. The thermogravimetric analysis (TG) under non-isothermal conditions was used to preliminary estimate the oxidation behavior of alloys at different temperatures. During experiment, differential thermal analysis (DTA) was performed simultaneously. After this test, cyclic oxidation expermients was carried out at 800°C for 500 h. In as-cast state, Ce segregates to interdendritic areas and forms intermetallic phases. The effect connected with melting of interdendritic precipitates was observed at 1160°C. Ce-containing alloys were less prone of oxide spallation. Moreover, oxidation rate of these alloys substantially decreased after 100h of oxidation, whereas mass of the sample corresponding to base alloy continued to increase. |
| first_indexed | 2024-12-10T17:06:55Z |
| format | Article |
| id | doaj.art-e2c1518539874b16b542b144930c77f0 |
| institution | Directory Open Access Journal |
| issn | 2300-1909 |
| language | English |
| last_indexed | 2024-12-10T17:06:55Z |
| publishDate | 2022-02-01 |
| publisher | Polish Academy of Sciences |
| record_format | Article |
| series | Archives of Metallurgy and Materials |
| spelling | doaj.art-e2c1518539874b16b542b144930c77f02022-12-22T01:40:26ZengPolish Academy of SciencesArchives of Metallurgy and Materials2300-19092022-02-01vol. 67No 1203208https://doi.org/10.24425/amm.2022.137490Effect of Rare Earth Cerium Addition on Oxidation Behavior of Co-Al-W Alloys at 800°CD. Migas0https://orcid.org/0000-0003-0328-964XT. Liptáková1https://orcid.org/0000-0001-7670-5259G. Moskal2https://orcid.org/0000-0001-7396-6568Silesian University of Technology, Faculty of Materials Engineering, Department of Materials Technologies , Katowice, PolandUniversity of Zilina, Faculty of Mechanical Engineering, Department of Material Engineering, Zilina, Slovak RepublicSilesian University of Technology, Faculty of Materials Engineering, Department of Materials Technologies , Katowice, PolandThe γ/γ′ Co-based alloys are a new class of cobalt superalloys, which are characterized by remarkable high temperature strength owing to strengthening by γ′-Co3(Al, X) phases. In this investigation, the effect of cerium addition on oxidation behavior of model Co-Al-W alloys was studied. The introduction of Ce aimed at improvement of the oxidation resistance of γ′-forming Co-based superalloys. The minor additions of cerium (0.1, 0.5 at.%) were added to the base alloy Co-9Al-9W. The alloys were prepared via induction vacuum melting (VIM). Further, a primary microstructure of the alloys was analyzed with particular regard to a segregation of Ce. The thermogravimetric analysis (TG) under non-isothermal conditions was used to preliminary estimate the oxidation behavior of alloys at different temperatures. During experiment, differential thermal analysis (DTA) was performed simultaneously. After this test, cyclic oxidation expermients was carried out at 800°C for 500 h. In as-cast state, Ce segregates to interdendritic areas and forms intermetallic phases. The effect connected with melting of interdendritic precipitates was observed at 1160°C. Ce-containing alloys were less prone of oxide spallation. Moreover, oxidation rate of these alloys substantially decreased after 100h of oxidation, whereas mass of the sample corresponding to base alloy continued to increase.https://journals.pan.pl/Content/122524/PDF/AMM-2022-1-25-Migas.pdfrare earth elementsreecyclic oxidationγ-γ′ cobalt-based superalloysco-ce |
| spellingShingle | D. Migas T. Liptáková G. Moskal Effect of Rare Earth Cerium Addition on Oxidation Behavior of Co-Al-W Alloys at 800°C Archives of Metallurgy and Materials rare earth elements ree cyclic oxidation γ-γ′ cobalt-based superalloys co-ce |
| title | Effect of Rare Earth Cerium Addition on Oxidation Behavior of Co-Al-W Alloys at 800°C |
| title_full | Effect of Rare Earth Cerium Addition on Oxidation Behavior of Co-Al-W Alloys at 800°C |
| title_fullStr | Effect of Rare Earth Cerium Addition on Oxidation Behavior of Co-Al-W Alloys at 800°C |
| title_full_unstemmed | Effect of Rare Earth Cerium Addition on Oxidation Behavior of Co-Al-W Alloys at 800°C |
| title_short | Effect of Rare Earth Cerium Addition on Oxidation Behavior of Co-Al-W Alloys at 800°C |
| title_sort | effect of rare earth cerium addition on oxidation behavior of co al w alloys at 800°c |
| topic | rare earth elements ree cyclic oxidation γ-γ′ cobalt-based superalloys co-ce |
| url | https://journals.pan.pl/Content/122524/PDF/AMM-2022-1-25-Migas.pdf |
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