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学者姓名：张冬云
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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 ：
Al4SiC4 Al4SiC4 AlSi10Mg-10SiC composite AlSi10Mg-10SiC composite Elastic modulus Elastic modulus Selective laser melting Selective laser melting
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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 ：
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.
关键词 ：
Johnson-Cook损伤模型 Johnson-Cook损伤模型 压缩性能 压缩性能 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 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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摘要 ：
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。
关键词 ：
力学性能 力学性能 多孔结构 多孔结构 拓扑优化 拓扑优化 激光技术 激光技术 激光粉末床熔融 激光粉末床熔融 骨植入体 骨植入体
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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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摘要 ：
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.
关键词 ：
Carbides Carbides Creep Creep Heat treatment Heat treatment Microstructure Microstructure Morphology Morphology Selective laser melting Selective laser melting Tensile strength Tensile strength Tensile testing Tensile testing
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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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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 ：
Laser powder bed fusion Laser powder bed fusion Mechanical behavior Mechanical behavior Microstructure Microstructure TA15 TA15
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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 . |
| 导入链接 | NoteExpress RIS BibTex |
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 ：
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 . |
| 导入链接 | NoteExpress RIS BibTex |
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Inconel 718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合金的显微组织和综合力学性能,并满足锻件的使用要求.
关键词 ：
激光选区熔化 激光选区熔化 力学性能 力学性能 数值模拟 数值模拟 Inconel 718 Inconel 718 热处理 热处理
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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 , 2020 , 37 (3) : 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 37 . 3 (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 , 2020 , 37 (3) , 82-88 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
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.
关键词 ：
mechanical properties mechanical properties porous structure porous structure selective laser melting selective laser melting Ti6Al4V Ti6Al4V unit cell size unit cell size
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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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摘要 ：
采用激光选区熔化技术制造了不同单元结构尺寸(1～6 mm)、孔隙率(40％～80％)的拓扑优化多孔阵列结构,研究了单元结构尺寸对其压缩形变规律和弹性性能的影响.结果 表明,多孔阵列结构的抗压强度、弹性模量均与单元结构尺寸成反比,抗压强度在126～199MPa,弹性模量在3.5～55.47 GPa;压缩应力-应变曲线与单元结构尺寸有关,分别遵循弹性、弹脆性和脆性多孔材料3种应力应变规律;通过数值模拟多孔阵列结构的压缩形变过程,解释了2种45°断裂带的成因,力学性能与实验结果基本吻合;利用Gibson-Ashby模型评价多孔结构的稳定性,稳定性参数C与单元结构尺寸成反比;给出Gibson-Ashby拟合方程,特征参数n随单元结构尺寸增加而增大;建立了单元结构尺寸、相对密度和相对弹性模量的三维曲面数学模型,提出骨植入体的设计区域.
关键词 ：
Ti6Al4V Ti6Al4V 力学性能 力学性能 单元结构尺寸 单元结构尺寸 多孔结构 多孔结构 激光选区熔化 激光选区熔化
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| GB/T 7714 | 徐仰立 , 张冬云 , 胡松涛 et al. 结构尺寸对多孔Ti6Al4V力学性能的影响 [J]. | 稀有金属材料与工程 , 2020 , 49 (5) : 1736-1742 . |
| MLA | 徐仰立 et al. "结构尺寸对多孔Ti6Al4V力学性能的影响" . | 稀有金属材料与工程 49 . 5 (2020) : 1736-1742 . |
| APA | 徐仰立 , 张冬云 , 胡松涛 , 陈润平 , 顾亦磊 , 陶炯鸣 et al. 结构尺寸对多孔Ti6Al4V力学性能的影响 . | 稀有金属材料与工程 , 2020 , 49 (5) , 1736-1742 . |
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