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学者姓名：张冬云
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Abstract ：
The building quality of the LPBF ( laser powder bed fusion)-fabricated component is critical to determine whether it can be applied in the serving condition. However, it is determined not only by process parameters; the powder property and its affecting factors such as average particle sizes and particle size distribution of powder materials have also significant effect on the building quality. In order to investigate the correlation between the building quality and powder properties, five kinds of powder materials with different average particle sizes and particle size distributions of P (mu 20, sigma 10), P (mu 35,sigma 10), P (mu 50,sigma 10), P (mu 35,sigma 5), and P (mu 35,sigma 15) are prepared on the basis of the Horsfield filling method. The powder properties such as flowability and apparent density are tested, the build qualities such as dimensional accuracy and surface roughness are measured, and their correlation is analyzed. The results show that the powder material with a narrower particle size distribution benefits flowability. That with medium particle size distribution and average particle size, such as P (mu 35,sigma 10), possesses the highest apparent density and acceptable flowability, and the components manufactured with such powder material have the best surface roughness and dimensional accuracy. Besides, an amount of fine particles is required to optimize component density. The above systematic experiments exhibit the correlation among the particle size distribution and the average particle size, powder properties, and build quality, which is beneficial to preparing the powder materials, improving the irradiation conditions of the laser beam, controlling the LPBF process, and further the building quality of LPBF-fabricated component.
Keyword ：
Dimensional accuracy Dimensional accuracy Powder property Powder property Building quality Building quality Laser powder bed fusion (LPBF) Laser powder bed fusion (LPBF) Ti6Al4V powder material Ti6Al4V powder material
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| GB/T 7714 | Hu, Songtao , Zhang, Dongyun , Dong, Dongdong et al. Influence of the properties of Ti6Al4V powder materials on the build quality of laser powder bed fusion-manufactured components [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2023 , 129 (1-2) : 969-982 . |
| MLA | Hu, Songtao et al. "Influence of the properties of Ti6Al4V powder materials on the build quality of laser powder bed fusion-manufactured components" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 129 . 1-2 (2023) : 969-982 . |
| APA | Hu, Songtao , Zhang, Dongyun , Dong, Dongdong , Liu, Zhiyuan , Huang, Hao , Poprawe, Reinhart et al. Influence of the properties of Ti6Al4V powder materials on the build quality of laser powder bed fusion-manufactured components . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2023 , 129 (1-2) , 969-982 . |
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Abstract ：
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.
Keyword ：
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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Abstract ：
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.
Keyword ：
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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Abstract ：
人体骨骼为层级结构,由密度、强度较高的密质骨和密度较低、内含血管的松质骨组成。因此,人体植入物的结构和力学性能要与人体骨骼特征相匹配。基于人体自然骨的受力情况,采用激光粉末床熔融(LPBF)技术成形了由拓扑优化方法设计的钛合金多孔结构,然后通过压缩实验和数值模拟的方法对多孔结构的力学性能和变形失效模式进行了分析,发现数值模拟与实验结果具有较高的一致性。最后,通过与人体自然骨的力学性能对比,并结合多孔结构的失效模式获得了可适用于人体植入物的多孔材料。
Keyword ：
骨植入体 骨植入体 力学性能 力学性能 多孔结构 多孔结构 拓扑优化 拓扑优化 激光粉末床熔融 激光粉末床熔融 激光技术 激光技术
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| GB/T 7714 | 陈润平 , 张冬云 , 胡松涛 et al. 激光粉末床熔融成形多孔结构的压缩性能及数值模拟研究 [J]. | 激光与光电子学进展 , 2021 , 58 (17) : 293-301 . |
| MLA | 陈润平 et al. "激光粉末床熔融成形多孔结构的压缩性能及数值模拟研究" . | 激光与光电子学进展 58 . 17 (2021) : 293-301 . |
| APA | 陈润平 , 张冬云 , 胡松涛 , 徐仰立 , 黄婷婷 , 张龙 et al. 激光粉末床熔融成形多孔结构的压缩性能及数值模拟研究 . | 激光与光电子学进展 , 2021 , 58 (17) , 293-301 . |
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Abstract ：
根据人体自然骨的受力情况,运用拓扑优化与激光选区熔化技术相结合的方法设计制造一系列多孔材料,采用实验和模拟的方法对其中孔隙率为50%,胞元尺寸分别为3、4、6 mm的钛合金多孔材料的压缩性能进行研究.建立准静态压缩模型,引入Johnson-Cook损伤模型,获得压缩过程中材料局部失效特征.研究结果显示,多孔材料的变形失效行为由线弹性、平台以及失效3个阶段组成,模拟和压缩实验获得的多孔材料抗压强度相近.在多孔材料变形失效模拟过程中,胞元连接处以及中央粗柱产生塑性铰,并表现出独特的分阶段塑性变形以及断裂特征,因此多孔材料在平台阶段保持较高承载能力,最终多孔材料因斜向断裂带的产生而完全失效.
Keyword ：
Johnson-Cook损伤模型 Johnson-Cook损伤模型 变形和失效行为 变形和失效行为 多孔材料 多孔材料 有限元分析 有限元分析 压缩性能 压缩性能 钛合金 钛合金
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| GB/T 7714 | 张冬云 , 胡松涛 , 陈润平 et al. 3D打印Ti6Al4V多孔材料压缩性能 [J]. | 北京工业大学学报 , 2021 , 47 (11) : 1275-1283 . |
| MLA | 张冬云 et al. "3D打印Ti6Al4V多孔材料压缩性能" . | 北京工业大学学报 47 . 11 (2021) : 1275-1283 . |
| APA | 张冬云 , 胡松涛 , 陈润平 , 张泰 . 3D打印Ti6Al4V多孔材料压缩性能 . | 北京工业大学学报 , 2021 , 47 (11) , 1275-1283 . |
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Abstract ：
The human bone appears as a hierarchical structure composed of cortical bone with high density and strength and cancellous bone with low density and blood vessels. Therefore, the structure and mechanical properties of human implants should match the characteristics of human bone. Based on the stress on the natural human bone, the titanium alloy porous structure designed by topology optimization method was fabricated by laser powder bed fusion (LBPF). The mechanical properties and deformation failure mode of the porous structure were analyzed by compression experiment and numerical simulation. It was found that the numerical simulation and experimental results have a high consistency in the current work. Finally, by comparing with the mechanical properties of human natural bone, combined with the failure mode of porous structure, a porous material suitable for human implants was obtained.
Keyword ：
laser powder bed fusion laser powder bed fusion bone implant bone implant porous structure porous structure mechanical properties mechanical properties topology optimization topology optimization laser technique laser technique
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| GB/T 7714 | Chen Runping , Zhang Dongyun , Hu Songtao et al. Compressive Properties and Numerical Simulation of Porous Structure Fabricated by Laser Powder Bed Fusion [J]. | LASER & OPTOELECTRONICS PROGRESS , 2021 , 58 (17) . |
| MLA | Chen Runping et al. "Compressive Properties and Numerical Simulation of Porous Structure Fabricated by Laser Powder Bed Fusion" . | LASER & OPTOELECTRONICS PROGRESS 58 . 17 (2021) . |
| APA | Chen Runping , Zhang Dongyun , Hu Songtao , Xu Yangli , Huang Tingting , Zhang Long et al. Compressive Properties and Numerical Simulation of Porous Structure Fabricated by Laser Powder Bed Fusion . | LASER & OPTOELECTRONICS PROGRESS , 2021 , 58 (17) . |
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Abstract ：
Microstructure, mechanical performances at elevated temperature (650 °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 δ 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 °C, solution treatment in 980 °C and conventional aging treatment shows the optimum mechanical properties at 650 °C. © 2020 Elsevier B.V.
Keyword ：
Morphology Morphology Creep Creep Carbides Carbides Tensile strength Tensile strength Microstructure Microstructure Tensile testing Tensile testing Selective laser melting Selective laser melting Heat treatment Heat treatment
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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 , 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 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 , 2021 , 801 . |
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Abstract ：
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.
Keyword ：
Composite Composite Selective laser melting Selective laser melting Ni-coated graphene Ni-coated graphene Micro-CT Micro-CT
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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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Abstract ：
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.
Keyword ：
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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Abstract ：
Topology optimized porous lattice structure with different unit cell sizes (1 similar to 6 mm) and porosities (40 similar to 80%) were fabricated by Selective Laser Melting, and their compressive deformation behavior and elastic properties were discussed. The results show that compressive strength and elastic modulus of lattice structure were inversely proportional to unit cell size. Their compressive strength ranged from 126 to 199 MPa and elastic modulus ranged from 3.5 to 55.47 GPa. The stress-strain curves of lattice structures with different unit cell sizes followed three kinds of stress-strain laws: elastic material, elastic-brittle material and brittle material. The compressive deformation process simulated by ABAQUS explained the reason of two 45 degrees fracture band. The numerical results show a good agreement with experimental results. The stability was evaluated by Gibson-Ashby model, and the stability parameter C decreased with the increase of unit cell size. Meanwhile, the fitting curves based on Gibson-Ashby model were established, and the value of n increased with the increase of unit cell size. A 3D surface mathematical model combining unit cell size, relative density and relative elastic modulus was established, and the design area satisfying mechanical properties of bone implants was proposed.
Keyword ：
mechanical properties mechanical properties unit cell size unit cell size Ti6Al4V Ti6Al4V selective laser melting selective laser melting porous structure porous structure
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| GB/T 7714 | Xu Yangli , Zhang Dongyun , Hu Songtao et al. Unit Cell Size Effect on Mechanical Properties of Ti6Al4V Porous Structure [J]. | RARE METAL MATERIALS AND ENGINEERING , 2020 , 49 (5) : 1736-1742 . |
| MLA | Xu Yangli et al. "Unit Cell Size Effect on Mechanical Properties of Ti6Al4V Porous Structure" . | RARE METAL MATERIALS AND ENGINEERING 49 . 5 (2020) : 1736-1742 . |
| APA | Xu Yangli , Zhang Dongyun , Hu Songtao , Chen Runping , Gu Yilei , Tao Jiongming et al. Unit Cell Size Effect on Mechanical Properties of Ti6Al4V Porous Structure . | RARE METAL MATERIALS AND ENGINEERING , 2020 , 49 (5) , 1736-1742 . |
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