Influence of laser absorptivity of CuCr0.8 substrate surface state on the characteristics of laser directed energy deposition inconel 718 single track
An effective method for fabricating copper-nickel bimetallic liquid rocket engine thrust chambers involves utilizing laser directed energy deposition (LDED) technology. However, the state of the substrate surface significantly impacts the LDED process. This study investigates the effects of various...
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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/S2238785424021835 |
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| author | Baopeng Zhang Haifeng Xiao Weicheng Wang Feiyang Li Yun Wang Haihong Zhu |
| author_facet | Baopeng Zhang Haifeng Xiao Weicheng Wang Feiyang Li Yun Wang Haihong Zhu |
| author_sort | Baopeng Zhang |
| collection | DOAJ |
| description | An effective method for fabricating copper-nickel bimetallic liquid rocket engine thrust chambers involves utilizing laser directed energy deposition (LDED) technology. However, the state of the substrate surface significantly impacts the LDED process. This study investigates the effects of various substrate treatments on LDED single tracks, using CuCr0.8 high-copper alloy as the substrate and Inconel 718 as the deposition material. The treatments include polishing, sandblasting, laser etching, and cold spraying. Substrate surface roughness, laser absorptivity, molten pool morphology, and microstructure were characterized, and the mechanisms of laser absorptivity change and the different LDED processes were analyzed. The results indicate that the laser-etched surface exhibits the worst surface roughness (Ra 15.20 ± 0.60 μm), the highest laser absorptivity(80.70% at 1080 nm wavelength), the largest deposition width (947.33 ± 29.85 μm), and the maximum number of fine grains among the four substrates. Additionally, the cold-sprayed surface shows the largest deposition depth (237.33 ± 39.04 μm), the minimum number of fine grains and a higher laser absorptivity (66.20% at 1080 nm wavelength). In situ observations of molten pool formation and flow during LDED was conducted using an in situ high-speed high-resolution imaging system. The mechanisms underlying the alteration in laser absorptivity primarily involve the ''trapped light'' effect and modifications to the surface material. This research is significant as it provides foundational insights for laser processing of highly reflective materials, offering important theoretical and practical implications for engineering applications. |
| format | Article |
| id | doaj-art-dffd9bfb263f4167996ef46f1192f8cb |
| 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-dffd9bfb263f4167996ef46f1192f8cb2025-08-20T01:57:20ZengElsevierJournal of Materials Research and Technology2238-78542024-11-01331898190910.1016/j.jmrt.2024.09.178Influence of laser absorptivity of CuCr0.8 substrate surface state on the characteristics of laser directed energy deposition inconel 718 single trackBaopeng Zhang0Haifeng Xiao1Weicheng Wang2Feiyang Li3Yun Wang4Haihong Zhu5Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, ChinaXI’AN Space Engine Company Limited, Xi’An, 710100, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China; Ezhou Institute of Industrial Technology, Hubei, 430071, China; Corresponding author. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China.An effective method for fabricating copper-nickel bimetallic liquid rocket engine thrust chambers involves utilizing laser directed energy deposition (LDED) technology. However, the state of the substrate surface significantly impacts the LDED process. This study investigates the effects of various substrate treatments on LDED single tracks, using CuCr0.8 high-copper alloy as the substrate and Inconel 718 as the deposition material. The treatments include polishing, sandblasting, laser etching, and cold spraying. Substrate surface roughness, laser absorptivity, molten pool morphology, and microstructure were characterized, and the mechanisms of laser absorptivity change and the different LDED processes were analyzed. The results indicate that the laser-etched surface exhibits the worst surface roughness (Ra 15.20 ± 0.60 μm), the highest laser absorptivity(80.70% at 1080 nm wavelength), the largest deposition width (947.33 ± 29.85 μm), and the maximum number of fine grains among the four substrates. Additionally, the cold-sprayed surface shows the largest deposition depth (237.33 ± 39.04 μm), the minimum number of fine grains and a higher laser absorptivity (66.20% at 1080 nm wavelength). In situ observations of molten pool formation and flow during LDED was conducted using an in situ high-speed high-resolution imaging system. The mechanisms underlying the alteration in laser absorptivity primarily involve the ''trapped light'' effect and modifications to the surface material. This research is significant as it provides foundational insights for laser processing of highly reflective materials, offering important theoretical and practical implications for engineering applications.http://www.sciencedirect.com/science/article/pii/S2238785424021835Laser-directed energy depositionLaser absorptivitySubstrate surface statesMolten pool morphologyHigh-speed video camera |
| spellingShingle | Baopeng Zhang Haifeng Xiao Weicheng Wang Feiyang Li Yun Wang Haihong Zhu Influence of laser absorptivity of CuCr0.8 substrate surface state on the characteristics of laser directed energy deposition inconel 718 single track Journal of Materials Research and Technology Laser-directed energy deposition Laser absorptivity Substrate surface states Molten pool morphology High-speed video camera |
| title | Influence of laser absorptivity of CuCr0.8 substrate surface state on the characteristics of laser directed energy deposition inconel 718 single track |
| title_full | Influence of laser absorptivity of CuCr0.8 substrate surface state on the characteristics of laser directed energy deposition inconel 718 single track |
| title_fullStr | Influence of laser absorptivity of CuCr0.8 substrate surface state on the characteristics of laser directed energy deposition inconel 718 single track |
| title_full_unstemmed | Influence of laser absorptivity of CuCr0.8 substrate surface state on the characteristics of laser directed energy deposition inconel 718 single track |
| title_short | Influence of laser absorptivity of CuCr0.8 substrate surface state on the characteristics of laser directed energy deposition inconel 718 single track |
| title_sort | influence of laser absorptivity of cucr0 8 substrate surface state on the characteristics of laser directed energy deposition inconel 718 single track |
| topic | Laser-directed energy deposition Laser absorptivity Substrate surface states Molten pool morphology High-speed video camera |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424021835 |
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