The Oxide Scales Formed on Different Co-Ni Based Superalloys During Isothermal Oxidation at 800 and 900°C
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...
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| Format: | Article |
| Language: | English |
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Polish Academy of Sciences
2020-12-01
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| Series: | Archives of Metallurgy and Materials |
| Subjects: | |
| Online Access: | https://journals.pan.pl/Content/117781/PDF/AMM-2021-1-01-Migas.pdf |
| _version_ | 1818490360032133120 |
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| author | D. Migas M. Kierat G. Moskal |
| author_facet | D. Migas M. Kierat G. Moskal |
| author_sort | D. Migas |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-10T17:15:43Z |
| format | Article |
| id | doaj.art-99937f8093af4135a593f0dd883494a4 |
| institution | Directory Open Access Journal |
| issn | 2300-1909 |
| language | English |
| last_indexed | 2024-12-10T17:15:43Z |
| publishDate | 2020-12-01 |
| publisher | Polish Academy of Sciences |
| record_format | Article |
| series | Archives of Metallurgy and Materials |
| spelling | doaj.art-99937f8093af4135a593f0dd883494a42022-12-22T01:40:08ZengPolish Academy of SciencesArchives of Metallurgy and Materials2300-19092020-12-01vol. 66No 1514https://doi.org/10.24425/amm.2021.134752The Oxide Scales Formed on Different Co-Ni Based Superalloys During Isothermal Oxidation at 800 and 900°CD. Migashttps://orcid.org/0000-0003-0328-964XM. Kierathttps://orcid.org/0000-0002-6288-197XG. Moskalhttps://orcid.org/0000-0001-7396-6568In 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.https://journals.pan.pl/Content/117781/PDF/AMM-2021-1-01-Migas.pdfγ–γ′ cobalt-based superalloyshigh temperature oxidationco-ni superalloyw-free cobalt superalloys |
| spellingShingle | D. Migas M. Kierat G. Moskal The Oxide Scales Formed on Different Co-Ni Based Superalloys During Isothermal Oxidation at 800 and 900°C Archives of Metallurgy and Materials γ–γ′ cobalt-based superalloys high temperature oxidation co-ni superalloy w-free cobalt superalloys |
| title | The Oxide Scales Formed on Different Co-Ni Based Superalloys During Isothermal Oxidation at 800 and 900°C |
| title_full | The Oxide Scales Formed on Different Co-Ni Based Superalloys During Isothermal Oxidation at 800 and 900°C |
| title_fullStr | The Oxide Scales Formed on Different Co-Ni Based Superalloys During Isothermal Oxidation at 800 and 900°C |
| title_full_unstemmed | The Oxide Scales Formed on Different Co-Ni Based Superalloys During Isothermal Oxidation at 800 and 900°C |
| title_short | The Oxide Scales Formed on Different Co-Ni Based Superalloys During Isothermal Oxidation at 800 and 900°C |
| title_sort | oxide scales formed on different co ni based superalloys during isothermal oxidation at 800 and 900°c |
| topic | γ–γ′ cobalt-based superalloys high temperature oxidation co-ni superalloy w-free cobalt superalloys |
| url | https://journals.pan.pl/Content/117781/PDF/AMM-2021-1-01-Migas.pdf |
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