Track trajectory, molten pool and defect characterization in NiTi single-track selective laser melting (SLM) experiments
In order to explore the law of selective laser melting (SLM) forming of Nitinol alloy, and obtain high quality additive manufacturing parameters of Nitinol alloy, a series of single-track SLM experiments on Nitinol alloy were conducted under different combined parameters of laser power and scanning...
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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/S2238785424023822 |
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| author | Peiyu Dong Zhiyong Li Dejia Li Yazhou Yu Wei Zhang |
| author_facet | Peiyu Dong Zhiyong Li Dejia Li Yazhou Yu Wei Zhang |
| author_sort | Peiyu Dong |
| collection | DOAJ |
| description | In order to explore the law of selective laser melting (SLM) forming of Nitinol alloy, and obtain high quality additive manufacturing parameters of Nitinol alloy, a series of single-track SLM experiments on Nitinol alloy were conducted under different combined parameters of laser power and scanning speed. The effects of laser power, scanning speed and linear energy density on track forming, molten pool evolution and pore formation were systematically discussed by characterizing the track trajectory, molten pool morphology, dimensions and defects of the molten pool, and the ideal process parameters were obtained. The experimental results revealed that the average track width and width uniformity decreased with the increase of the scanning speed, the spheroidization phenomenon and height fluctuation became more pronounced, and the phenomena of necking, subsection and interruption increased significantly at the fixed laser power. Under the fixed scanning speed, the width, height and width uniformity of the molten track gradually increased with the increase of the laser power, and the phenomena of spheroidization, subsection and interruption gradually reduced. Moreover, the upper zone of the molten pool is shaped like an inverted bowl, and the lower zone is mainly divided into five categories, which are lack of fusion, shallow bowl shape, deep bowl shape, keyhole shape and deeper keyhole shape under different process parameters. The defects of the molten pool mainly include lack of fusion and trapped gas. An ideal molten pool without defects can be obtained under the parameter conditions of 100–150W laser power and 100–200 mm/s spanning speed. |
| format | Article |
| id | doaj-art-109d87a0ba3041c88f37b80dd2fcd5e0 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-109d87a0ba3041c88f37b80dd2fcd5e02024-12-26T08:54:39ZengElsevierJournal of Materials Research and Technology2238-78542024-11-013352105222Track trajectory, molten pool and defect characterization in NiTi single-track selective laser melting (SLM) experimentsPeiyu Dong0Zhiyong Li1Dejia Li2Yazhou Yu3Wei Zhang4School of Mechanical Engineering, Shandong University of Technology, Zibo, ChinaCorresponding author.; School of Mechanical Engineering, Shandong University of Technology, Zibo, ChinaSchool of Mechanical Engineering, Shandong University of Technology, Zibo, ChinaSchool of Mechanical Engineering, Shandong University of Technology, Zibo, ChinaSchool of Mechanical Engineering, Shandong University of Technology, Zibo, ChinaIn order to explore the law of selective laser melting (SLM) forming of Nitinol alloy, and obtain high quality additive manufacturing parameters of Nitinol alloy, a series of single-track SLM experiments on Nitinol alloy were conducted under different combined parameters of laser power and scanning speed. The effects of laser power, scanning speed and linear energy density on track forming, molten pool evolution and pore formation were systematically discussed by characterizing the track trajectory, molten pool morphology, dimensions and defects of the molten pool, and the ideal process parameters were obtained. The experimental results revealed that the average track width and width uniformity decreased with the increase of the scanning speed, the spheroidization phenomenon and height fluctuation became more pronounced, and the phenomena of necking, subsection and interruption increased significantly at the fixed laser power. Under the fixed scanning speed, the width, height and width uniformity of the molten track gradually increased with the increase of the laser power, and the phenomena of spheroidization, subsection and interruption gradually reduced. Moreover, the upper zone of the molten pool is shaped like an inverted bowl, and the lower zone is mainly divided into five categories, which are lack of fusion, shallow bowl shape, deep bowl shape, keyhole shape and deeper keyhole shape under different process parameters. The defects of the molten pool mainly include lack of fusion and trapped gas. An ideal molten pool without defects can be obtained under the parameter conditions of 100–150W laser power and 100–200 mm/s spanning speed.http://www.sciencedirect.com/science/article/pii/S2238785424023822Selected laser melting (SLM)Nitinol alloyTrack trajectoryMolten poolPorosity defect |
| spellingShingle | Peiyu Dong Zhiyong Li Dejia Li Yazhou Yu Wei Zhang Track trajectory, molten pool and defect characterization in NiTi single-track selective laser melting (SLM) experiments Journal of Materials Research and Technology Selected laser melting (SLM) Nitinol alloy Track trajectory Molten pool Porosity defect |
| title | Track trajectory, molten pool and defect characterization in NiTi single-track selective laser melting (SLM) experiments |
| title_full | Track trajectory, molten pool and defect characterization in NiTi single-track selective laser melting (SLM) experiments |
| title_fullStr | Track trajectory, molten pool and defect characterization in NiTi single-track selective laser melting (SLM) experiments |
| title_full_unstemmed | Track trajectory, molten pool and defect characterization in NiTi single-track selective laser melting (SLM) experiments |
| title_short | Track trajectory, molten pool and defect characterization in NiTi single-track selective laser melting (SLM) experiments |
| title_sort | track trajectory molten pool and defect characterization in niti single track selective laser melting slm experiments |
| topic | Selected laser melting (SLM) Nitinol alloy Track trajectory Molten pool Porosity defect |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424023822 |
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