In-situ SEM-EBSD investigation of the low-cycle fatigue deformation behavior of Inconel 718 at grain-scale
The low-cycle fatigue (LCF) deformation behavior of the Inconel 718 (IN718) specimen with micro-notch was investigated by an in-situ fatigue test inside a scanning electron microscope (SEM) combined with electron backscattered diffraction (EBSD). The initiation condition and propagation path of crac...
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Elsevier
2023-05-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423008372 |
| _version_ | 1797798758823493632 |
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| author | Guanghao Guo Wenxiang Jiang Xuan Liu Jutian Chen Longyu Li Jin Wang Yuefei Zhang Ze Zhang |
| author_facet | Guanghao Guo Wenxiang Jiang Xuan Liu Jutian Chen Longyu Li Jin Wang Yuefei Zhang Ze Zhang |
| author_sort | Guanghao Guo |
| collection | DOAJ |
| description | The low-cycle fatigue (LCF) deformation behavior of the Inconel 718 (IN718) specimen with micro-notch was investigated by an in-situ fatigue test inside a scanning electron microscope (SEM) combined with electron backscattered diffraction (EBSD). The initiation condition and propagation path of cracks were observed by SEM. The essential reasons for crack initiation, propagation and fatigue fracture are elaborately characterized by crystallographic information obtained from EBSD. Meanwhile, the strain evolution during fatigue deformation simulated by the crystal plastic finite element (CPFE) method is consistent with the experimental content, which further verifies and supplements the experimental results. Two LCF deformation mechanisms (location-related) of the IN718 specimen are proposed at grain-scale based on the direct observation of crack characteristics and in-depth analysis. Near the edge micro-notch region, the deformation mechanism is mainly related to crack initiation and propagation: the plastic strain localization along the most easily activated slip band leads to the initiation of fatigue microcracks inside the grain. The crack propagation is carried out by microcrack coalescence in different grains. Away from the edge micro-notch region, the deformation mechanism is mainly related to the instantaneous fatigue fracture: fatigue fracture comes from the intergranular plastic strain accumulation and heterogenous deformation at grain-scale. The result also deeply explains the fatigue crack propagation in metals (two consecutive modes). |
| first_indexed | 2024-03-13T04:09:42Z |
| format | Article |
| id | doaj.art-bfe31ff27ccb4b20a86096ad0ec7857a |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-13T04:09:42Z |
| publishDate | 2023-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-bfe31ff27ccb4b20a86096ad0ec7857a2023-06-21T06:56:55ZengElsevierJournal of Materials Research and Technology2238-78542023-05-012450075023In-situ SEM-EBSD investigation of the low-cycle fatigue deformation behavior of Inconel 718 at grain-scaleGuanghao Guo0Wenxiang Jiang1Xuan Liu2Jutian Chen3Longyu Li4Jin Wang5Yuefei Zhang6Ze Zhang7Institute of Superalloys Science and Technology, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, ChinaFaculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, ChinaInstitute of Superalloys Science and Technology, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, ChinaFaculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, ChinaInstitute of Superalloys Science and Technology, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, ChinaInstitute of Superalloys Science and Technology, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China; Corresponding author.Institute of Superalloys Science and Technology, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China; Corresponding author.Institute of Superalloys Science and Technology, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, ChinaThe low-cycle fatigue (LCF) deformation behavior of the Inconel 718 (IN718) specimen with micro-notch was investigated by an in-situ fatigue test inside a scanning electron microscope (SEM) combined with electron backscattered diffraction (EBSD). The initiation condition and propagation path of cracks were observed by SEM. The essential reasons for crack initiation, propagation and fatigue fracture are elaborately characterized by crystallographic information obtained from EBSD. Meanwhile, the strain evolution during fatigue deformation simulated by the crystal plastic finite element (CPFE) method is consistent with the experimental content, which further verifies and supplements the experimental results. Two LCF deformation mechanisms (location-related) of the IN718 specimen are proposed at grain-scale based on the direct observation of crack characteristics and in-depth analysis. Near the edge micro-notch region, the deformation mechanism is mainly related to crack initiation and propagation: the plastic strain localization along the most easily activated slip band leads to the initiation of fatigue microcracks inside the grain. The crack propagation is carried out by microcrack coalescence in different grains. Away from the edge micro-notch region, the deformation mechanism is mainly related to the instantaneous fatigue fracture: fatigue fracture comes from the intergranular plastic strain accumulation and heterogenous deformation at grain-scale. The result also deeply explains the fatigue crack propagation in metals (two consecutive modes).http://www.sciencedirect.com/science/article/pii/S2238785423008372Inconel 718Low-cycle fatigueCrystal plastic finite elementSlip morphologyPlastic strain evolution |
| spellingShingle | Guanghao Guo Wenxiang Jiang Xuan Liu Jutian Chen Longyu Li Jin Wang Yuefei Zhang Ze Zhang In-situ SEM-EBSD investigation of the low-cycle fatigue deformation behavior of Inconel 718 at grain-scale Journal of Materials Research and Technology Inconel 718 Low-cycle fatigue Crystal plastic finite element Slip morphology Plastic strain evolution |
| title | In-situ SEM-EBSD investigation of the low-cycle fatigue deformation behavior of Inconel 718 at grain-scale |
| title_full | In-situ SEM-EBSD investigation of the low-cycle fatigue deformation behavior of Inconel 718 at grain-scale |
| title_fullStr | In-situ SEM-EBSD investigation of the low-cycle fatigue deformation behavior of Inconel 718 at grain-scale |
| title_full_unstemmed | In-situ SEM-EBSD investigation of the low-cycle fatigue deformation behavior of Inconel 718 at grain-scale |
| title_short | In-situ SEM-EBSD investigation of the low-cycle fatigue deformation behavior of Inconel 718 at grain-scale |
| title_sort | in situ sem ebsd investigation of the low cycle fatigue deformation behavior of inconel 718 at grain scale |
| topic | Inconel 718 Low-cycle fatigue Crystal plastic finite element Slip morphology Plastic strain evolution |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423008372 |
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