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学者姓名：张冬云
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摘要 ：
The extreme high-speed laser material deposition (EHLA) process has the potential to enable additive manufacturing for mass production by overcoming the limitations of slow scanning speed in conventional laser material deposition (LMD) processes. Thermal features are the key factors to link process and properties. A sound understanding of process-thermal-property relationships is essential for performance control and process optimization of a deposited component. In this study, we studied the thermal characteristics within a single layer and among layers for continuous processing using the numerical method, and reveal the mechanism of microstructure and hardness changes of AISI 4140 material formed by EHLA and LMD processes through the analysis of thermal properties and temperature history results. The grain size and hardness evolution for both processes during single-layer cladding and continuous forming processes were investigated. The results revealed that the grain refinement effect in continuous LMD processing is stronger than that in EHLA process (from 30.0 mu m for single layer to 3.2 mu m for multi layers vs. from 18.6 mu m for single layer to 2.2 mu m for multi layers). Similar hardness values were obtained by LMD and EHLA processes, with mean values of 511 HV and 472 HV, respectively. The yield and tensile strengths of EHLA were superior to the conventional cast material, but inferior to those of the conventional material quenched and tempered at lower temperatures. The enhanced tensile results of EHLA process were found similar to those prepared through conventional method with quench and tempering at 600 degrees C.
关键词 ：
Mechanical properties Mechanical properties Microstructure Microstructure AISI 4140 AISI 4140 Extreme high-speed laser material deposition Extreme high-speed laser material deposition Intrinsic heat treatment Intrinsic heat treatment
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| GB/T 7714 | Li, Tianci , Zhang, Dongyun , Zhang, Lele et al. Thermal features and its effect on the properties of AISI 4140 fabricated by conventional and extreme high-speed laser material deposition [J]. | JOURNAL OF MANUFACTURING PROCESSES , 2024 , 131 : 1372-1387 . |
| MLA | Li, Tianci et al. "Thermal features and its effect on the properties of AISI 4140 fabricated by conventional and extreme high-speed laser material deposition" . | JOURNAL OF MANUFACTURING PROCESSES 131 (2024) : 1372-1387 . |
| APA | Li, Tianci , Zhang, Dongyun , Zhang, Lele , Schopphoven, Thomas , Gasser, Andres , Poprawe, Reinhart . Thermal features and its effect on the properties of AISI 4140 fabricated by conventional and extreme high-speed laser material deposition . | JOURNAL OF MANUFACTURING PROCESSES , 2024 , 131 , 1372-1387 . |
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摘要 ：
Vat photopolymerization 3D printing provides a novel approach for preparing broadband wave-transparent Si3N4/(3-SiAlON composite ceramics. This paper oxidized raw powder to introduce low dielectric phases (SiO2) and overcome the low curing depth of alpha-Si3N4. The solid content of oxidized alpha-Si3N4 was increased to 50 vol% for the first time by modification with dispersant. The selected print thickness of 50 mu m was the highest known for Si3N4 vat photopolymerization 3D printing, greatly improving printing efficiency. Finally, Si3N4/(3-SiAlON composite ceramics were sintered in the range of 1600-1800 degrees C, and the mechanical and dielectric properties were systematically studied. The composite ceramics sintering at 1780 degrees C had a maximum bending strength of 236 +/- 16 MPa, and the real permittivity was 4.83. At 1800 degrees C the porosity increased resulting in bending strength decreased to 109 +/- 4 MPa, and the real permittivity to 3.23. This study filled the gap in the posttreatment of oxidized alpha-Si3N4 and guided the application of Si3N4/(3-SiAlON composite ceramics in the field of wave-transparent.
关键词 ：
Powder oxidation Powder oxidation Si 3 N 4 /(3-SiAlON composite ceramics Si 3 N 4 /(3-SiAlON composite ceramics Broadband wave-transparent ceramics Broadband wave-transparent ceramics Vat photopolymerization 3D printing Vat photopolymerization 3D printing
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| GB/T 7714 | Chen, Zihuan , Duan, Wenyan , Zhao, Chunyang et al. Mechanical and dielectric properties of Si3N4/(3-SiAlON composite ceramics fabricated by vat photopolymerization 3D printing technology [J]. | CERAMICS INTERNATIONAL , 2024 , 50 (18) : 32549-32560 . |
| MLA | Chen, Zihuan et al. "Mechanical and dielectric properties of Si3N4/(3-SiAlON composite ceramics fabricated by vat photopolymerization 3D printing technology" . | CERAMICS INTERNATIONAL 50 . 18 (2024) : 32549-32560 . |
| APA | Chen, Zihuan , Duan, Wenyan , Zhao, Chunyang , Wang, Xuye , Jin, Baojie , Hu, Chuanqi et al. Mechanical and dielectric properties of Si3N4/(3-SiAlON composite ceramics fabricated by vat photopolymerization 3D printing technology . | CERAMICS INTERNATIONAL , 2024 , 50 (18) , 32549-32560 . |
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摘要 ：
Vat photopolymerization 3D printing of Si3N4 ceramics has attracted great attention recently. To overcome the low curing depth limitation caused by alpha-Si3N4, beta-Si3N4 with low absorbance and large particle size was selected in this paper. After printing, the effects of pressureless sintering temperatures on mechanical and dielectric properties were systematically investigated. At 1800 degrees C, the real permittivity of Si3N4 ceramics was 7.37, and the maximum bending strength was 367 +/- 75 MPa. Considering the application of Si3N4 ceramics in radomes/ windows, the dielectric constant of Si3N4 ceramics should be further reduced. Therefore, the octet-truss lattice structure was introduced to optimize the porosity of ceramics. As the porosity increased from 25% to 36%, the real permittivity decreased from 5.56 to 4.42, and the bending strength ranged from 98 +/- 7-62 +/- 13 MPa. It shows that vat photopolymerization 3D printing can be a promising technology for the fabrication of wavetransparent Si3N4 ceramics.
关键词 ：
Vat photopolymerization Vat photopolymerization Sintering temperature Sintering temperature Octet -truss lattice structure Octet -truss lattice structure Si 3 N 4 ceramics Si 3 N 4 ceramics Broadband wave -transparent ceramics Broadband wave -transparent ceramics
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| GB/T 7714 | Chen, Zihuan , Duan, Wenyan , Zhang, Dongyun et al. Fabrication of broadband wave-transparent Si3N4 ceramics with octet-truss lattice structure by vat photopolymerization 3D printing technology [J]. | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2023 , 44 (4) : 2026-2036 . |
| MLA | Chen, Zihuan et al. "Fabrication of broadband wave-transparent Si3N4 ceramics with octet-truss lattice structure by vat photopolymerization 3D printing technology" . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 44 . 4 (2023) : 2026-2036 . |
| APA | Chen, Zihuan , Duan, Wenyan , Zhang, Dongyun , Wang, Xuye , Li, Tao , Zhao, Chunyang et al. Fabrication of broadband wave-transparent Si3N4 ceramics with octet-truss lattice structure by vat photopolymerization 3D printing technology . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2023 , 44 (4) , 2026-2036 . |
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摘要 ：
In order to track the free interface of the melt pool and understand the evolution of the melt pool, the flow of fluid, and the interface behavior of gas and liquid, a physical model is developed by using the VOF method in this paper. Its characteristics are a combined heat source model, including a parabolic rotation and a cylindrical distribution, and a powder bed stochastic distributed model with powder particle size. The unit interface between the metallic and gas phase in the laser-powder interaction zone can only be loaded by the heat source. Only the first and second laser scanning tracks are simulated to reduce the calculation time. The simulation results show that process parameters such as laser power and scanning speed have significant effects on the fluid flow and surface morphology in the melt pool, which are in good agreement with the experimental results. Compared with the first track, the second track has larger melt pool geometry, higher melt temperature, and faster fluid flow. The melt flows intensely at the initial position due to the high flow rate in the limited melt space. Because there is enough space for the metal flow, the second track can obtain smooth surface morphology more easily compared to the first track. The melt pool temperature at the laser beam center fluctuates during the laser scanning process. This depends on the effects of the interaction between heat conduction or heat accumulation or the interaction between heat accumulation and violent fluid flow. The temperature distribution and fluid flow in the melt pool benefit the analysis and understanding of the evolution mechanism of the melt pool geometry and surface topography and further allow regulation of the L-PBF process of Ti6Al4V.
关键词 ：
temperature distribution temperature distribution melt pool evolution melt pool evolution Ti6Al4V Ti6Al4V fluid flow fluid flow laser powder bed fusion (L-PBF) process laser powder bed fusion (L-PBF) process numerical simulation numerical simulation
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| GB/T 7714 | Xu, Yixuan , Zhang, Dongyun , Deng, Junyuan et al. Numerical Simulation in the Melt Pool Evolution of Laser Powder Bed Fusion Process for Ti6Al4V [J]. | MATERIALS , 2022 , 15 (21) . |
| MLA | Xu, Yixuan et al. "Numerical Simulation in the Melt Pool Evolution of Laser Powder Bed Fusion Process for Ti6Al4V" . | MATERIALS 15 . 21 (2022) . |
| APA | Xu, Yixuan , Zhang, Dongyun , Deng, Junyuan , Wu, Xuping , Li, Lingshan , Xie, Yinkai et al. Numerical Simulation in the Melt Pool Evolution of Laser Powder Bed Fusion Process for Ti6Al4V . | MATERIALS , 2022 , 15 (21) . |
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摘要 ：
In this study, a 10 wt% SiC-reinforced AlSi10Mg-based composites is prepared by selective laser melting (SLM) process. The effect of laser linear energy density on phase morphology, microstructure, and mechanical properties of AlSi10Mg-10SiC composite is investigated. There is relatively higher density, no obvious pores and cracks in the SLM-fabricated AlSi10Mg-10SiC composites with laser linear energy densities ranging from 90.64 J/mm(3) to 104.16 J/mm(3). The high laser linear energy density promotes the in-situ reaction between SiC particle and Al melt in the melt pool, the Al4SiC4 phase forms during SLM fabrication process. Driven by Marangoni convection, the fine SiC particles and Al4SiC4 phase distributes uniformly. When the laser linear energy density is 104.16 J/mm(3), the composite exhibits the highest average micro hardness of 208.5 HV0.1. When the laser linear energy density is 90.64 J/mm(3), the composite displays the highest yield strength and modulus with values of 408 MPa and 90 Gpa, respectively. During the deformation process of tensile test, the higher modulus SiC particles could withstand greater load transfer, which improves the modulus and yield strength of the composites. (C) 2021 Published by Elsevier B.V.
关键词 ：
Selective laser melting Selective laser melting Al4SiC4 Al4SiC4 AlSi10Mg-10SiC composite AlSi10Mg-10SiC composite Elastic modulus Elastic modulus
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| GB/T 7714 | Zhang, Dongyun , Yi, Denghao , Wu, Xuping et al. SiC reinforced AlSi10Mg composites fabricated by selective laser melting [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2022 , 894 . |
| MLA | Zhang, Dongyun et al. "SiC reinforced AlSi10Mg composites fabricated by selective laser melting" . | JOURNAL OF ALLOYS AND COMPOUNDS 894 (2022) . |
| APA | Zhang, Dongyun , Yi, Denghao , Wu, Xuping , Liu, Zhiyuan , Wang, Weidong , Poprawe, Reinhart et al. SiC reinforced AlSi10Mg composites fabricated by selective laser melting . | JOURNAL OF ALLOYS AND COMPOUNDS , 2022 , 894 . |
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摘要 ：
Laser powder bed fusion (LPBF) process is a promising additive manufacturing technique to manufacture multi-material integrated parts with complex structures. In this paper, the multi-material structure of Ti6Al4V/ AlSi10Mg is fabricated by LPBF, the interfacial characterization, interfacial reaction mechanism and mechanical properties of Ti/Al structure are investigated. Results show that continuous and excellent metallurgical bonding between Ti6Al4V and AlSi10Mg is obtained, and the width of interface zone is about 100 ??m. The equiaxed grains of aluminum alloy at the interface show random crystallographic orientation, which is attributed to the thermal dynamics in the melt pool, thermal cycles during LPBF process and lower thermal conductivity of ti-tanium alloy. The interfacial reaction layers are orderly from titanium alloy to the aluminum alloy consisting of Ti3Al, TiAl with nanoparticles Ti5Si3 and rod-like TiAl3. The segregated Si atoms react with the dissolution of Ti atoms in-situ to form Ti5Si3, meanwhile, a mass of Al atoms also react with Ti atoms to form TiAl. Namely, the TiAl phase forms in thin layer shape embedded with nanoparticles Ti5Si3 through eutectic reaction near the fusion line at the interface. At the wall of eutectic production, the TiAl3 phase nucleation and grow opposite to the heat dissipation direction and vertical to the fusion line. Outside the fusion line, the supersaturated solid ??-Ti transforms to Ti3Al through the diffusion of Al atoms in the part of titanium alloy. During the interfacial reaction, in-situ generated nanoparticles Ti5Si3 could improve the joint strength, and the tensile strength of Ti6Al4V/ AlSi10Mg specimens reached 264.8 ?? 22.4 MPa. The tensile specimens exhibit brittle fracture and two typical fracture morphologies appear on the fracture surface. Superscript/Subscript Available</comment
关键词 ：
Ti Ti Interfacial characterization Interfacial characterization Mechanical properties Mechanical properties Al multi-material structure Al multi-material structure Interfacial reaction mechanism Interfacial reaction mechanism LPBF LPBF
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| GB/T 7714 | Wu, Xuping , Zhang, Dongyun , Yi, Denghao et al. Interfacial characterization and reaction mechanism of Ti/Al multi-material structure during laser powder bed fusion process [J]. | MATERIALS CHARACTERIZATION , 2022 , 192 . |
| MLA | Wu, Xuping et al. "Interfacial characterization and reaction mechanism of Ti/Al multi-material structure during laser powder bed fusion process" . | MATERIALS CHARACTERIZATION 192 (2022) . |
| APA | Wu, Xuping , Zhang, Dongyun , Yi, Denghao , Hu, Songtao , Huang, Guoliang , Poprawe, Reinhart et al. Interfacial characterization and reaction mechanism of Ti/Al multi-material structure during laser powder bed fusion process . | MATERIALS CHARACTERIZATION , 2022 , 192 . |
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摘要 ：
A Ni-coated graphene (Ni-Gr) reinforced Inconel 625 composite was prepared by selective laser melting. The microstructure of the composite exhibited random aligned columnar dendrites due to the addition of Ni-Gr. The Ni-Gr defects were alleviated under high-intensity laser-beam irradiation. The Micro-CT showed that the pore density increased by 46% of Inconel 625 due to the addition of Ni-Gr. The flaky, open-ring NiGr appeared due to the action of Marangoni convection and the surface tension. Furthermore, the addition of Ni-Gr improved the diffusion capacity of the friction heat. Inconel 625 composite displayed tiny bits of oxidized debris. (c) 2021 Elsevier B.V. All rights reserved.
关键词 ：
Composite Composite Micro-CT Micro-CT Ni-coated graphene Ni-coated graphene Selective laser melting Selective laser melting
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| GB/T 7714 | Yi, Denghao , Li, Xiaofeng , Wang, Congwei et al. Formation and influence of graphene in Inconel 625 prepared by selective laser melting [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 878 . |
| MLA | Yi, Denghao et al. "Formation and influence of graphene in Inconel 625 prepared by selective laser melting" . | JOURNAL OF ALLOYS AND COMPOUNDS 878 (2021) . |
| APA | Yi, Denghao , Li, Xiaofeng , Wang, Congwei , Zhang, Jinfang , Yang, Xiaohui , Zhang, Dongyun . Formation and influence of graphene in Inconel 625 prepared by selective laser melting . | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 878 . |
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摘要 ：
TA15 titanium alloy has been widely used in the aerospace industry due to its moderate high-temperature performance. In this research, TA15 samples with excellent mechanical properties were successfully fabricated by laser powder bed fusion (LPBF). Results show that the microstructure of TA15 sample is composed of acicular alpha ' martensites within the columnar prior beta grain. During manufacturing process of LPBF, the non-equilibrium heating and cooling of the thermal cycles experiencing different peak temperatures result in the hierarchical structure of martensite. After heat treatment at 750 degrees C, 840 degrees C, 900 degrees C, and 940 degrees C for two hours, the fine martensitic structure has transformed into a mixture of alpha and beta. With the increase of temperature, the volume fraction of beta increases from 10.3% to 49.9%, the width of primary alpha increases from 0.72 +/- 0.16 & micro;m to 2.96 +/- 0.17 & micro;m because of the simultaneous fragmentation of the primary alpha. So the ultimate and yield strengths decrease while the elongation increases. After heat treatment at 940 degrees C, the specimen shows the best comprehensive mechanical properties, the elongation increases to 11.5%, the tensile strength is 1061 MPa, and the yield strength is 961 MPa. The fracture surface shows the typically ductile fracture character. (c) 2021 Elsevier B.V. All rights reserved.
关键词 ：
TA15 TA15 Mechanical behavior Mechanical behavior Microstructure Microstructure Laser powder bed fusion Laser powder bed fusion
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| GB/T 7714 | Wu, Xuping , Zhang, Dongyun , Guo, Yanwu et al. Microstructure and mechanical evolution behavior of LPBF (laser powder bed fusion)-fabricated TA15 alloy [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 873 . |
| MLA | Wu, Xuping et al. "Microstructure and mechanical evolution behavior of LPBF (laser powder bed fusion)-fabricated TA15 alloy" . | JOURNAL OF ALLOYS AND COMPOUNDS 873 (2021) . |
| APA | Wu, Xuping , Zhang, Dongyun , Guo, Yanwu , Zhang, Tai , Liu, Zhiyuan . Microstructure and mechanical evolution behavior of LPBF (laser powder bed fusion)-fabricated TA15 alloy . | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 873 . |
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摘要 ：
Microstructure, mechanical performances at elevated temperature (650 degrees C) and their correlation of Inconel 718 manufactured by Selective Laser Melting (SLM) were investigated in this paper. Four kinds of heat treatment schemes including homogenization, solution treatment and conventional aging process were carried out to regulate the microstructure in order to obtain the optimum comprehensive mechanical performances at high temperature. The dimension and morphology of grains, subgrains, different precipitates including delta phase, strengthening phase, carbides and nitrides were investigated. In addition, their evolution mechanism was also analyzed in detail. Furthermore, for figuring out the effects of microstructures on the mechanical performance, creep rupture test and tensile test were carried out to compare the performance differences of heat-treated samples. The results demonstrated that the heat-treated samples show the better creep rupture performance and higher tensile strength at elevated temperature than that of the wrought. In addition, the sample under homogenization heat treatment in 1080 degrees C, solution treatment in 980 degrees C and conventional aging treatment shows the optimum mechanical properties at 650 degrees C.
关键词 ：
High temperature mechanical performances High temperature mechanical performances Strengthening phases Strengthening phases Selective laser melting Selective laser melting Inconel 718 Inconel 718 delta phase delta phase
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| GB/T 7714 | Cao, Ming , Zhang, Dongyun , Gao, Yang et al. The effect of homogenization temperature on the microstructure and high temperature mechanical performance of SLM-fabricated IN718 alloy [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2021 , 801 . |
| MLA | Cao, Ming et al. "The effect of homogenization temperature on the microstructure and high temperature mechanical performance of SLM-fabricated IN718 alloy" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 801 (2021) . |
| APA | Cao, Ming , Zhang, Dongyun , Gao, Yang , Chen, Runping , Huang, Guoliang , Feng, Zhe et al. The effect of homogenization temperature on the microstructure and high temperature mechanical performance of SLM-fabricated IN718 alloy . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2021 , 801 . |
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摘要 ：
针对Inconel 718合金零部件传统制造技术中存在的制造极限问题,基于材料合金显微组织与力学性能之间的相关性等内容,开展激光选区熔化(SLM)成形Inconel 718合金性能的研究,建立了适用于SLM成形Inconel718合金的热处理制度,提高了该合金的室温与高温力学性能。考虑到SLM成形Inconel 718合金组织内部晶粒极其细小、内应力积累较大,传统的热处理制度不再适合新技术成形的零部件,根据基体中二次相的析出温度区间,对该合金的传统后热处理制度进行改进。力学性能测试结果证明:项目组提出的均匀化热处理+固溶处理+双时效的热处理制度能有效改善SLM成形Inconel 718合金的显...
关键词 ：
Inconel 718 Inconel 718 热处理 热处理 激光选区熔化 激光选区熔化 数值模拟 数值模拟 力学性能 力学性能
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| GB/T 7714 | 张冬云 , 高阳 , 曹明 et al. SLM成形Inconel 718合金的组织性能调控研究 [J]. | 上海航天(中英文) , 2020 , 37 (03) : 82-88 . |
| MLA | 张冬云 et al. "SLM成形Inconel 718合金的组织性能调控研究" . | 上海航天(中英文) 37 . 03 (2020) : 82-88 . |
| APA | 张冬云 , 高阳 , 曹明 , 黄国亮 , 张镨丹 , 刘臻 et al. SLM成形Inconel 718合金的组织性能调控研究 . | 上海航天(中英文) , 2020 , 37 (03) , 82-88 . |
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