Anisotropy in microstructure and mechanical properties of additively manufactured Ni-based GH4099 alloy
Additively manufactured Ni-based superalloys exhibit strong anisotropy due to microstructural differences resulting from their unique fabrication method. This study systematically investagiated the microstructure and mechanical properties of Ni-based GH4099 alloy fabricated by Selective Laser Meltin...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-09-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423021622 |
| _version_ | 1797646680300978176 |
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| author | Xinyu Zhang Yongfeng Liang Feng Yi Han Liu Qingjun Zhou Zhenyu Yan Junpin Lin |
| author_facet | Xinyu Zhang Yongfeng Liang Feng Yi Han Liu Qingjun Zhou Zhenyu Yan Junpin Lin |
| author_sort | Xinyu Zhang |
| collection | DOAJ |
| description | Additively manufactured Ni-based superalloys exhibit strong anisotropy due to microstructural differences resulting from their unique fabrication method. This study systematically investagiated the microstructure and mechanical properties of Ni-based GH4099 alloy fabricated by Selective Laser Melting (SLM) with subsequent heat treatment (HT). The causes of anisotropy in the deformation mechanism of alloys at room temperature and high temperatures are discussed. The results indicate that epitaxial grain growth occurs along the building direction, and after SLM, entangled dislocations gather at the cell boundaries. After HT, high-density dislocations are eliminated, while most grains remain in the as-deposited form. At room temperature, the deformation mechanism of the alloy remains consistent. Cracks generate and propagate inside grains, while grain boundaries provide a more substantial barrier for dislocations. Therefore, the difference in mechanical anisotropy depends on the difference in grain morphology in the build direction and perpendicular to the build direction. At high temperatures, fracture failure occurs at grain boundaries. The growth of carbides at high temperatures leads to the weakening of grain boundaries. The alloy exhibits different deformation mechanisms when loaded along the short and long axes of the grain. Only dislocations are activated when loaded along the short axis of the grain. Stacking faults and deformation twins provide higher plastic-deformation ability when loaded along the long axis of the grains. Moreover, dislocations also activate, however the dislocation density is lower compared to loaded along the short axis. |
| first_indexed | 2024-03-11T15:05:09Z |
| format | Article |
| id | doaj.art-cdf915ef264244da9680881a2f7c9103 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-11T15:05:09Z |
| publishDate | 2023-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-cdf915ef264244da9680881a2f7c91032023-10-30T06:04:22ZengElsevierJournal of Materials Research and Technology2238-78542023-09-012665526564Anisotropy in microstructure and mechanical properties of additively manufactured Ni-based GH4099 alloyXinyu Zhang0Yongfeng Liang1Feng Yi2Han Liu3Qingjun Zhou4Zhenyu Yan5Junpin Lin6State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, ChinaState Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China; Corresponding author.State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, ChinaCapital Aerospace Machinery Co., Ltd., Beijing 100076, ChinaCapital Aerospace Machinery Co., Ltd., Beijing 100076, ChinaCapital Aerospace Machinery Co., Ltd., Beijing 100076, ChinaState Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China; Corresponding author.Additively manufactured Ni-based superalloys exhibit strong anisotropy due to microstructural differences resulting from their unique fabrication method. This study systematically investagiated the microstructure and mechanical properties of Ni-based GH4099 alloy fabricated by Selective Laser Melting (SLM) with subsequent heat treatment (HT). The causes of anisotropy in the deformation mechanism of alloys at room temperature and high temperatures are discussed. The results indicate that epitaxial grain growth occurs along the building direction, and after SLM, entangled dislocations gather at the cell boundaries. After HT, high-density dislocations are eliminated, while most grains remain in the as-deposited form. At room temperature, the deformation mechanism of the alloy remains consistent. Cracks generate and propagate inside grains, while grain boundaries provide a more substantial barrier for dislocations. Therefore, the difference in mechanical anisotropy depends on the difference in grain morphology in the build direction and perpendicular to the build direction. At high temperatures, fracture failure occurs at grain boundaries. The growth of carbides at high temperatures leads to the weakening of grain boundaries. The alloy exhibits different deformation mechanisms when loaded along the short and long axes of the grain. Only dislocations are activated when loaded along the short axis of the grain. Stacking faults and deformation twins provide higher plastic-deformation ability when loaded along the long axis of the grains. Moreover, dislocations also activate, however the dislocation density is lower compared to loaded along the short axis.http://www.sciencedirect.com/science/article/pii/S2238785423021622Ni-based alloySelective laser meltingHeat treatmentMicrostructureMechanical propertiesAnisotropy |
| spellingShingle | Xinyu Zhang Yongfeng Liang Feng Yi Han Liu Qingjun Zhou Zhenyu Yan Junpin Lin Anisotropy in microstructure and mechanical properties of additively manufactured Ni-based GH4099 alloy Journal of Materials Research and Technology Ni-based alloy Selective laser melting Heat treatment Microstructure Mechanical properties Anisotropy |
| title | Anisotropy in microstructure and mechanical properties of additively manufactured Ni-based GH4099 alloy |
| title_full | Anisotropy in microstructure and mechanical properties of additively manufactured Ni-based GH4099 alloy |
| title_fullStr | Anisotropy in microstructure and mechanical properties of additively manufactured Ni-based GH4099 alloy |
| title_full_unstemmed | Anisotropy in microstructure and mechanical properties of additively manufactured Ni-based GH4099 alloy |
| title_short | Anisotropy in microstructure and mechanical properties of additively manufactured Ni-based GH4099 alloy |
| title_sort | anisotropy in microstructure and mechanical properties of additively manufactured ni based gh4099 alloy |
| topic | Ni-based alloy Selective laser melting Heat treatment Microstructure Mechanical properties Anisotropy |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423021622 |
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