Unconventional precipitation and martensitic transformation behaviour of Ni-rich NiTi alloy fabricated via laser-directed energy deposition
In this study, we report an unconventional precipitation and martensitic transformation behaviour of directly aged Ni-rich NiTi alloys fabricated via laser-directed energy deposition (LDED). Ni4Ti3 particles precipitate uniformly under all ageing conditions and no traditional multiple-step martensit...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2023-12-01
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| Series: | Virtual and Physical Prototyping |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1080/17452759.2023.2231415 |
| _version_ | 1797678607804399616 |
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| author | Jingtao Kang Ruidi Li Dan Zheng Huiting Wu Minbo Wang Pengda Niu Jian Li Xinyan Liu Duan Lai Tiechui Yuan |
| author_facet | Jingtao Kang Ruidi Li Dan Zheng Huiting Wu Minbo Wang Pengda Niu Jian Li Xinyan Liu Duan Lai Tiechui Yuan |
| author_sort | Jingtao Kang |
| collection | DOAJ |
| description | In this study, we report an unconventional precipitation and martensitic transformation behaviour of directly aged Ni-rich NiTi alloys fabricated via laser-directed energy deposition (LDED). Ni4Ti3 particles precipitate uniformly under all ageing conditions and no traditional multiple-step martensitic transformations are observed. We conclude this unique behaviour to the intrinsic characteristics of the LDED technique, which are metastable microstructures and high residual stresses. On the one hand, these features make grain boundaries no longer a fevered location for precipitation and, on the other hand, significantly suppress the martensitic transformation when ageing at low temperatures (300°C/400°C). As the aging temperature increase (500°C), residual stresses release significantly, accompanied by the growth of Ni4Ti3 precipitates from several nanometres to 452 ± 181 nm with increased interparticle spacing. At the same time, reverse martensitic transformations change from two-step (B19′ → R → B2) to single-step (B19′ → B2). |
| first_indexed | 2024-03-11T23:02:21Z |
| format | Article |
| id | doaj.art-329ff1882c6e40129b70fbafa2ff1299 |
| institution | Directory Open Access Journal |
| issn | 1745-2759 1745-2767 |
| language | English |
| last_indexed | 2024-03-11T23:02:21Z |
| publishDate | 2023-12-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Virtual and Physical Prototyping |
| spelling | doaj.art-329ff1882c6e40129b70fbafa2ff12992023-09-21T14:38:04ZengTaylor & Francis GroupVirtual and Physical Prototyping1745-27591745-27672023-12-0118110.1080/17452759.2023.22314152231415Unconventional precipitation and martensitic transformation behaviour of Ni-rich NiTi alloy fabricated via laser-directed energy depositionJingtao Kang0Ruidi Li1Dan Zheng2Huiting Wu3Minbo Wang4Pengda Niu5Jian Li6Xinyan Liu7Duan Lai8Tiechui Yuan9Central South UniversityCentral South UniversityCentral South UniversityCentral South UniversityCentral South UniversityCentral South UniversityCentral South UniversityFarsoon Technologies Co., LtdFarsoon Technologies Co., LtdCentral South UniversityIn this study, we report an unconventional precipitation and martensitic transformation behaviour of directly aged Ni-rich NiTi alloys fabricated via laser-directed energy deposition (LDED). Ni4Ti3 particles precipitate uniformly under all ageing conditions and no traditional multiple-step martensitic transformations are observed. We conclude this unique behaviour to the intrinsic characteristics of the LDED technique, which are metastable microstructures and high residual stresses. On the one hand, these features make grain boundaries no longer a fevered location for precipitation and, on the other hand, significantly suppress the martensitic transformation when ageing at low temperatures (300°C/400°C). As the aging temperature increase (500°C), residual stresses release significantly, accompanied by the growth of Ni4Ti3 precipitates from several nanometres to 452 ± 181 nm with increased interparticle spacing. At the same time, reverse martensitic transformations change from two-step (B19′ → R → B2) to single-step (B19′ → B2).http://dx.doi.org/10.1080/17452759.2023.2231415laser-directed energy depositionnitini4ti3martensitic transformationprecipitation behaviour |
| spellingShingle | Jingtao Kang Ruidi Li Dan Zheng Huiting Wu Minbo Wang Pengda Niu Jian Li Xinyan Liu Duan Lai Tiechui Yuan Unconventional precipitation and martensitic transformation behaviour of Ni-rich NiTi alloy fabricated via laser-directed energy deposition Virtual and Physical Prototyping laser-directed energy deposition niti ni4ti3 martensitic transformation precipitation behaviour |
| title | Unconventional precipitation and martensitic transformation behaviour of Ni-rich NiTi alloy fabricated via laser-directed energy deposition |
| title_full | Unconventional precipitation and martensitic transformation behaviour of Ni-rich NiTi alloy fabricated via laser-directed energy deposition |
| title_fullStr | Unconventional precipitation and martensitic transformation behaviour of Ni-rich NiTi alloy fabricated via laser-directed energy deposition |
| title_full_unstemmed | Unconventional precipitation and martensitic transformation behaviour of Ni-rich NiTi alloy fabricated via laser-directed energy deposition |
| title_short | Unconventional precipitation and martensitic transformation behaviour of Ni-rich NiTi alloy fabricated via laser-directed energy deposition |
| title_sort | unconventional precipitation and martensitic transformation behaviour of ni rich niti alloy fabricated via laser directed energy deposition |
| topic | laser-directed energy deposition niti ni4ti3 martensitic transformation precipitation behaviour |
| url | http://dx.doi.org/10.1080/17452759.2023.2231415 |
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