Microstructural degradation of polycrystalline superalloys from oxidized carbides and implications on crack initiation
Surface connected carbides in a polycrystalline superalloy oxidized at 750 °C in air were studied as potential crack initiation sites. Lattice rotations measured in the γ/γ′ grains using high-resolution electron backscatter diffraction enabled investigation of the plastic deformation induced solely...
| Hoofdauteurs: | , , , , , |
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| Formaat: | Journal article |
| Gepubliceerd in: |
Elsevier
2018
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| _version_ | 1826257395552092160 |
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| author | Kontis, P Collins, D Wilkinson, A Reed, R Raabe, D Gault, B |
| author_facet | Kontis, P Collins, D Wilkinson, A Reed, R Raabe, D Gault, B |
| author_sort | Kontis, P |
| collection | OXFORD |
| description | Surface connected carbides in a polycrystalline superalloy oxidized at 750 °C in air were studied as potential crack initiation sites. Lattice rotations measured in the γ/γ′ grains using high-resolution electron backscatter diffraction enabled investigation of the plastic deformation induced solely by the oxidation of carbides. Dislocations were found to enhance γ′ precipitate dissolution kinetics, resulting in soft recrystallized regions in the vicinity of the oxidized carbide with substantial compositional variation compared to the original γ/γ′ microstructure. Ramifications of such deleterious oxidized carbides alongside soft recrystallized regions on the crack initiation life in superalloys are discussed. |
| first_indexed | 2024-03-06T18:17:32Z |
| format | Journal article |
| id | oxford-uuid:0520ee31-957e-45cd-918a-9445a47c0512 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T18:17:32Z |
| publishDate | 2018 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:0520ee31-957e-45cd-918a-9445a47c05122022-03-26T08:55:28ZMicrostructural degradation of polycrystalline superalloys from oxidized carbides and implications on crack initiationJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:0520ee31-957e-45cd-918a-9445a47c0512Symplectic Elements at OxfordElsevier2018Kontis, PCollins, DWilkinson, AReed, RRaabe, DGault, BSurface connected carbides in a polycrystalline superalloy oxidized at 750 °C in air were studied as potential crack initiation sites. Lattice rotations measured in the γ/γ′ grains using high-resolution electron backscatter diffraction enabled investigation of the plastic deformation induced solely by the oxidation of carbides. Dislocations were found to enhance γ′ precipitate dissolution kinetics, resulting in soft recrystallized regions in the vicinity of the oxidized carbide with substantial compositional variation compared to the original γ/γ′ microstructure. Ramifications of such deleterious oxidized carbides alongside soft recrystallized regions on the crack initiation life in superalloys are discussed. |
| spellingShingle | Kontis, P Collins, D Wilkinson, A Reed, R Raabe, D Gault, B Microstructural degradation of polycrystalline superalloys from oxidized carbides and implications on crack initiation |
| title | Microstructural degradation of polycrystalline superalloys from oxidized carbides and implications on crack initiation |
| title_full | Microstructural degradation of polycrystalline superalloys from oxidized carbides and implications on crack initiation |
| title_fullStr | Microstructural degradation of polycrystalline superalloys from oxidized carbides and implications on crack initiation |
| title_full_unstemmed | Microstructural degradation of polycrystalline superalloys from oxidized carbides and implications on crack initiation |
| title_short | Microstructural degradation of polycrystalline superalloys from oxidized carbides and implications on crack initiation |
| title_sort | microstructural degradation of polycrystalline superalloys from oxidized carbides and implications on crack initiation |
| work_keys_str_mv | AT kontisp microstructuraldegradationofpolycrystallinesuperalloysfromoxidizedcarbidesandimplicationsoncrackinitiation AT collinsd microstructuraldegradationofpolycrystallinesuperalloysfromoxidizedcarbidesandimplicationsoncrackinitiation AT wilkinsona microstructuraldegradationofpolycrystallinesuperalloysfromoxidizedcarbidesandimplicationsoncrackinitiation AT reedr microstructuraldegradationofpolycrystallinesuperalloysfromoxidizedcarbidesandimplicationsoncrackinitiation AT raabed microstructuraldegradationofpolycrystallinesuperalloysfromoxidizedcarbidesandimplicationsoncrackinitiation AT gaultb microstructuraldegradationofpolycrystallinesuperalloysfromoxidizedcarbidesandimplicationsoncrackinitiation |