Exploring the correlation between variants selection and applied stress in IN718 through transmission electron microscopic analysis
Both tensile and rupture strength of Inconel 718 (IN718) are influenced by the morphology and volume fraction of γ′′ precipitates. This study investigated the preferrable coarsening behaviors of γ′′ precipitation affected by applied stress during aging. Neutron diffraction reveals the clear presence...
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| Language: | English |
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Elsevier
2024-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424027492 |
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| author | Fangchen Liu Fanqiang Meng Hanzhong Deng Yang Liu Lei Wang |
| author_facet | Fangchen Liu Fanqiang Meng Hanzhong Deng Yang Liu Lei Wang |
| author_sort | Fangchen Liu |
| collection | DOAJ |
| description | Both tensile and rupture strength of Inconel 718 (IN718) are influenced by the morphology and volume fraction of γ′′ precipitates. This study investigated the preferrable coarsening behaviors of γ′′ precipitation affected by applied stress during aging. Neutron diffraction reveals the clear presence of {004}, {204}and {116} peaks of the γ′′ precipitates in the specimens aged under 300 MPa, compared to the one without stress. Scanning Electron Microscopy and Electron Backscatter Diffraction analyses have demonstrated that the stress applied promote a selective alignment of the γ′′ precipitates, to the detriment of alternative variants. The growth of preferential variants is correlated with the angle between the stress direction and the orientation of face-centered cubic nickel matrix. Crystals adhere to this pattern with misorientation angles within 15° for the {100}γ, {110}γ, {111}γ, and {311}γ planes. Transmission electron microscopy observations coupled with growth free energy calculations have elucidated that the central region of the variants experiences tensile stress exerted by the matrix under applied stress. Concurrently, the energetic barrier at the variant tips is notably reduced. This energetic disparity accounts for the observed preferential growth of variants along their axial direction. |
| format | Article |
| id | doaj-art-4dd697ca651f4f89a8d68447757e1b92 |
| institution | OA Journals |
| issn | 2238-7854 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj-art-4dd697ca651f4f89a8d68447757e1b922025-08-20T02:35:32ZengElsevierJournal of Materials Research and Technology2238-78542024-11-01338958896610.1016/j.jmrt.2024.11.221Exploring the correlation between variants selection and applied stress in IN718 through transmission electron microscopic analysisFangchen Liu0Fanqiang Meng1Hanzhong Deng2Yang Liu3Lei Wang4Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai, 519000, ChinaSino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai, 519000, China; Corresponding author.College of Materials Science and Engineering, Liaoning Technical University, Fuxin, 123000, ChinaKey Lab for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang, 110819, ChinaKey Lab for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang, 110819, ChinaBoth tensile and rupture strength of Inconel 718 (IN718) are influenced by the morphology and volume fraction of γ′′ precipitates. This study investigated the preferrable coarsening behaviors of γ′′ precipitation affected by applied stress during aging. Neutron diffraction reveals the clear presence of {004}, {204}and {116} peaks of the γ′′ precipitates in the specimens aged under 300 MPa, compared to the one without stress. Scanning Electron Microscopy and Electron Backscatter Diffraction analyses have demonstrated that the stress applied promote a selective alignment of the γ′′ precipitates, to the detriment of alternative variants. The growth of preferential variants is correlated with the angle between the stress direction and the orientation of face-centered cubic nickel matrix. Crystals adhere to this pattern with misorientation angles within 15° for the {100}γ, {110}γ, {111}γ, and {311}γ planes. Transmission electron microscopy observations coupled with growth free energy calculations have elucidated that the central region of the variants experiences tensile stress exerted by the matrix under applied stress. Concurrently, the energetic barrier at the variant tips is notably reduced. This energetic disparity accounts for the observed preferential growth of variants along their axial direction.http://www.sciencedirect.com/science/article/pii/S2238785424027492Inconel 718Transmission electron microscopicNeutron diffractionLattice mismatchPreferential growth |
| spellingShingle | Fangchen Liu Fanqiang Meng Hanzhong Deng Yang Liu Lei Wang Exploring the correlation between variants selection and applied stress in IN718 through transmission electron microscopic analysis Journal of Materials Research and Technology Inconel 718 Transmission electron microscopic Neutron diffraction Lattice mismatch Preferential growth |
| title | Exploring the correlation between variants selection and applied stress in IN718 through transmission electron microscopic analysis |
| title_full | Exploring the correlation between variants selection and applied stress in IN718 through transmission electron microscopic analysis |
| title_fullStr | Exploring the correlation between variants selection and applied stress in IN718 through transmission electron microscopic analysis |
| title_full_unstemmed | Exploring the correlation between variants selection and applied stress in IN718 through transmission electron microscopic analysis |
| title_short | Exploring the correlation between variants selection and applied stress in IN718 through transmission electron microscopic analysis |
| title_sort | exploring the correlation between variants selection and applied stress in in718 through transmission electron microscopic analysis |
| topic | Inconel 718 Transmission electron microscopic Neutron diffraction Lattice mismatch Preferential growth |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424027492 |
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