Article
Materials Science, Ceramics
Jiandong Wang, Yuzhou Zeng, Xiaopeng Qi, Yu Xue, De Xu, Liqun Li, Yunxiang Tong, Fengchun Jiang
Summary: In this paper, TiCp/Ti6Al4V composites were fabricated using laser melting deposition (LMD) technology and the microstructure and microhardness of different deposited layers were analyzed. The results show that the composites have a graded microstructure and microhardness distribution. The microhardness increases gradually from the bottom layer to the top layer in the low power composite, while the high power composite shows a more significant increase in microhardness.
CERAMICS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
L. X. Meng, D. D. Ben, H. J. Yang, H. B. Ji, D. L. Lian, Y. K. Zhu, J. Chen, J. L. Yi, L. Wang, J. B. Yang, Z. F. Zhang
Summary: This study investigated the effects of single spherical defects on the tensile properties of SLM Ti6Al4V specimens. Different combinations of pore diameters and locations were designed to mimic sub-millimeter defects, showing negligible influence on elastic modulus and tensile strength but noticeable impact on tensile elongation. It was found that the specimens tended to have stochastic elongation to failure with increasing pore size, and fractured at a critical diameter of approximately 1000 μm. Additionally, the location of the embedded pore also influenced ductility, with elongation to failure decreasing as the embedded pore moved closer to the free surface.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Xiangxi Gao, Chunhu Tao, Sujun Wu, Bingqing Chen
Summary: The influences of selective laser melting (SLM) processing and post-processing on microstructure, crystallographic texture, and defect characteristics of SLM-produced Ti6Al4V alloys were extensively studied. The results showed that the microstructure and defects can be controlled through optimization of the SLM process and post-processing. Mechanical tests demonstrated that tensile properties were mainly dependent on the features of alpha phase/colony, leading to two types of fracture modes. The anisotropy in strength and ductility was attributed to the laminar heat-affected zone (HAZ) and lack of fusion (LOF) caused by SLM processing, respectively.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Nanoscience & Nanotechnology
J. Karimi, C. Suryanarayana, I Okulov, K. G. Prashanth
Summary: This study investigated the effect of remelting on the microstructure and mechanical properties of Ti6Al4V materials fabricated using selective laser melting. The results showed that the number of remeltings significantly influenced the homogenization of the microstructure and mechanical properties of the materials, with an increase in hardness and ultimate tensile strength but a decrease in ductility observed with a higher number of melting steps.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Wenbo Wang, Nuo Xu, Xiangyu Liu, Zhicheng Jing, Guojian Xu, Fei Xing
Summary: In this study, a bimetallic structure (BS) consisting of Inconel625 (IN625) nickel-base superalloy and Ti6Al4V (TC4) titanium alloy was successfully prepared using laser melting deposition (LMD) technology with Cu/V interlayers to prevent cracks and defects. The BS structure can be divided into four regions with different phase compositions and Vickers hardness distribution. The tensile strength of the IN625/TC4 BS with Cu/V interlayers reached around 514.5 ± 9.5 MPa at room temperature, and fractures occurred in region B.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Nanoscience & Nanotechnology
Wei Han, Jin Min, Guoqing Dai, Yanhua Guo, Lili Chang, Yaoqi Wang, Ertuan Zhao, Zhonggang Sun, Hui Chang
Summary: Y2O3 particles act as nucleation sites in the additive manufacturing (AM) process of titanium alloy, refining and homogenizing its microstructure, and improving its properties. Excessive addition of Y2O3 can increase the probability of material fracture, so the amount of Y2O3 addition must be strictly controlled.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Abdulaziz Kurdi, A. K. Basak
Summary: The mechanical properties and deformation behaviour of SLMed Ti6Al4V alloy are influenced by the microstructure and loading direction, resulting in anisotropy. The alloy exhibits higher yield and ultimate compressive strength compared to mill-annealed alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Ceramics
Jiandong Wang, Yuzhou Zeng, Weihang Fan, Liqun Li, Yunxiang Tong, Zhenqiang Wang, Fengchun Jiang
Summary: 20 vol% TiCp/Ti6Al4V composites were fabricated by laser melting deposition (LMD) method. The tensile strength of the composites was enhanced by regulating the dissolution of TiC particles. Higher heat input and pre-heating process facilitated the dissolution of TiC particles and promoted the formation of in-situ TiC phases, leading to an increase in tensile strength of the composites. The strengthening mechanism was attributed to the less susceptibility of in-situ TiC phases to cracking compared to undissolved TiC particles.
CERAMICS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Y. W. Guo, W. Wei, W. Shi, D. Xue, X. R. Zhou, S. P. Wen, X. L. Wu, K. Y. Gao, H. Huang, Z. R. Nie
Summary: In this study, Selective Laser Melting (SLM) was used to fabricate Erbium-modified AlSi7Mg alloy. The effects of laser volumetric energy density and focus shift on surface quality, internal defects, and microstructure were investigated. It was found that a higher volumetric energy density resulted in larger aluminum sub-cells and promoted the precipitation of supersaturated silicon elements. Laser focus shift changed the energy density and molten pool size, thereby affecting internal defects, sub-cell size, and eutectic silicon particle size. By using optimized processing parameters, a small amount of equiaxed grains formed at the boundary of the molten pool, which improved the refinement of columnar grains and enhanced mechanical properties. The alloy produced with SLM had a yield strength of 297 MPa, a tensile strength of 441 MPa, and an elongation of 8%.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Wentian Shi, Yufan Han, Jihang Li, Yude Liu, Yusheng Zhou, Yuxiang Lin
Summary: The tensile properties and microstructure of Ti6Al4V titanium alloy specimens prepared by different scanning strategies were studied. The specimens fabricated by the XY-scan strategy showed the best tensile properties. The fracture surfaces of the specimens were mainly composed of cleavage cracks and dimple cracks. The tensile properties were improved when the alpha'-phase direction of acicular martensite inside and outside the beta-phase of columnar crystal was parallel to the tensile direction.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2023)
Article
Chemistry, Physical
J. B. Gao, D. D. Ben, H. J. Yang, L. X. Meng, H. B. Ji, D. L. Lian, J. Chen, J. L. Yi, L. Wang, P. Li, Z. F. Zhang
Summary: This study investigates the rapid hardening and softening of SLM-Ti6Al4V alloy through electropulsing treatment, which affects the microhardness by evolving microstructures. Electropulsing treatment reduces the thermodynamic barrier for α->β solid-state phase transformation, further refining the microstructure of the SLM-Ti6Al4V alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Samuel Milton, Olivier Rigo, Sebastien LeCorre, Antoine Morandeau, Raveendra Siriki, Philippe Bocher, Rene Leroy
Summary: Additive Manufacturing (AM) processes like Selective Laser Melting (SLM) and Electron Beam Melting (EBM) were used to fabricate Ti6Al4V parts, and the machining behavior of these parts was studied. The microstructure and mechanical properties of the material were found to be strongly influenced by the type of AM process and subsequent heat treatment, impacting the machinability of the parts.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Haifei Lu, Zhao Wang, Jie Cai, Xiang Xu, Kaiyu Luo, Liujun Wu, Jinzhong Lu
Summary: The study revealed that laser shock peening treatment can effectively enhance the hot corrosion resistance of SLMed Ti6Al4V titanium alloy by generating high-density dislocations and nano-twins to enhance the grain boundary effect.
Article
Engineering, Mechanical
Zhao Qi, Bin Wang, Peng Zhang, Riu Liu, Zhenjun Zhang, Zhefeng Zhang
Summary: Through investigating the influence of a special structure formed during selective laser melting (SLM) process on fatigue crack growth (FCG) rate, it was found that the prior beta grains affected the macroscopic fracture morphology, but had no discernible influence on the FCG rate, while the morphology of the alpha phase affected the crack growth path and rate. Changes in the strength-toughness relationship induced by heat treatment helped understand the decrease in the FCG rate.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Nanoscience & Nanotechnology
Zhongpeng Zheng, Xin Jin, Yuchao Bai, Yun Yang, Chenbing Ni, Wen Feng Lu, Hao Wang
Summary: Anisotropies have been found in the microstructure and mechanical properties of SLM Ti-6Al-4V alloy, with the most pronounced anisotropy observed in the 0 degrees scanning strategy. The size of primary columnar crystals on the front surface is significantly larger than that on the top surface, with a microhardness difference of approximately 30%. A modified Johnson-Cook constitutive model for the SLM Ti6Al4V alloy has been developed with good accuracy for modeling and simulation purposes.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Chemical
Shuhan Li, Jingjing Yang, Zemin Wang
Summary: Multi-laser powder bed fusion (ML-PBF) is used to fabricate TA15 parts with different laser beam numbers for observing the effect on density, microstructure, and microhardness. Densification deteriorates as the number of laser beams increase. Laser-switching induced pores show different distribution patterns in different scanning strategies.
Article
Chemistry, Multidisciplinary
Yufeng Tao, Chunsan Deng, Jing Long, JingWei Liu, Xuejiao Wang, Xiaoxian Song, Chengchangfeng Lu, Jingjing Yang, Hui Hao, Chengbo Wang, Wenguang Zhang
Summary: Semiconductive hydrogels offer a valuable platform combining the advantages of metals and organisms, but traditional processing methods often fail to meet the needs of industries like mu-robotics and n-energy. A femtosecond laser lifting-off technique breaks conventional limitations, allowing for high-density integration and tunable electric conductivity. This technology enables the fabrication of various functional components for future optoelectronic products and energy storage solutions.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Meng He, Yan Li, Jie Yin, Qinglei Sun, Wei Xiong, Simeng Li, Lei Yang, Liang Hao
Summary: High precision lattice structures have great potential applications, and this study successfully designed and manufactured a unique heterogeneous glass sponge lattice structure with strong compressive properties and a unique fracture mechanism, which is expected to be widely used in various fields.
MATERIALS & DESIGN
(2022)
Article
Optics
Gao Piao, Lan Xinqiang, Zhou Yaxiong, Wang Yun, Yang Huanqing, Wang Zemin
Summary: The Fe-Cr-Ni-Co-Mo system is a new type of maraging stainless steel with ultra-high strength and good toughness, making it a potential structural material. Selective laser melting (SLM) is an effective method for manufacturing complex parts with high performance characteristics. Few public reports are available on the fabrication of Fe-Cr-Ni-Co-Mo MSSs by SLM.
CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG
(2022)
Article
Chemistry, Physical
Chunyang Zhao, Jingjing Yang, Guqiang Li, Zemin Wang
Summary: In this research, laser powder bed fusion (LPBF) was used to fabricate Mn-Cu alloys with high Mn contents. The results showed that the alloys with high relative densities and improved mechanical properties can be obtained by optimizing the processing parameters, indicating the promising potential of LPBF in fabricating Mn-Cu alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Shuncun Luo, Zemin Wang, Hiromi Nagaumi, Zibin Wu
Summary: The near-eutectic microstructures of AlCrCuFeNi3.0 high-entropy alloy prepared by selective laser melting can be adjusted by heat treatments to achieve desired mechanical properties. The formation of fine near-eutectic lamellar structures and coherent nano-precipitates contributes to the outstanding mechanical properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Review
Chemistry, Analytical
Zheng Li, Hao Li, Jie Yin, Yan Li, Zhenguo Nie, Xiangyou Li, Deyong You, Kai Guan, Wei Duan, Longchao Cao, Dengzhi Wang, Linda Ke, Yang Liu, Ping Zhao, Lin Wang, Kunpeng Zhu, Zhengwen Zhang, Liang Gao, Liang Hao
Summary: Spatter, an undesired phenomenon in laser powder bed fusion (L-PBF), has a significant impact on forming quality. Research on spatter is crucial in improving L-PBF systems.
Article
Engineering, Manufacturing
Jingjing Yang, Tongbo Wei, Chunyang Zhao, Hailong Liang, Zemin Wang, Chenyu Su
Summary: In this study, the selective laser melting technology was used to synthesize medium manganese Mn-xCu alloys directly from blended elemental powders. The effects of heat treatment on the microstructure and damping properties of the alloys were investigated. The results showed that solution and aging treatment significantly improved the damping capacity of the alloys.
3D PRINTING AND ADDITIVE MANUFACTURING
(2022)
Editorial Material
Chemistry, Analytical
Jie Yin, Yang Liu, Ping Zhao
Article
Chemistry, Analytical
Qiaoyu Chen, Yongbin Jing, Jie Yin, Zheng Li, Wei Xiong, Ping Gong, Lu Zhang, Simeng Li, Ruiqi Pan, Xiya Zhao, Liang Hao
Summary: Ag and Cu have typical highly electrical and thermal conductive (HETC) properties, and are widely used in key fields. Laser powder bed fusion (LPBF) has expanded the application of Ag-Cu in emerging high-tech fields. This study printed multi-material sandwich structures of Ag7.5Cu/Cu10Sn/Ag7.5Cu using LPBF, and studied the formation mechanism, interface characteristics, and molten pool behavior of the interfaces to reveal the influence of different building strategies.
Article
Engineering, Manufacturing
Qinglei Sun, Feifan Fang, Wenqing Wang, Jie Yin, Qiang Liu, Liang Hao, Yang Peng
Summary: Advanced lens fabricating techniques are urgently needed for WLEDs packaging due to the disadvantages of traditional LED lenses molding. This study demonstrated the fabrication of lenses using transparent resin and SLA 3D printing. The parameters were optimized to achieve accurate regulation of the lenses and satisfactory transmittance. The lighting characteristics of the SLA-fabricated lens packaged WLEDs highly depended on the lens structure, with lower lens height resulting in higher lighting energy density, efficiency, and wider light output angle. SLA 3D printing provides a flexible approach for fabricating WLED lenses to meet different lighting requirements.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Engineering, Manufacturing
Jingjing Yang, Yun Wang, Tongbo Wei, Zemin Wang
Summary: The hybrid selective laser melting (SLM) technology combines the advantages of both processes to produce large-scale, high-quality, high-resolution, and complicated-shaped metallic parts. The microstructure, microhardness, tensile properties, and corrosion resistance of laser-welded SLMed 304 stainless steel, Inconel 718 superalloy, and Ti-6Al-4V alloy were compared to explore the effect of SLMed microstructural anisotropy and crystal structure. The results showed differences in grain size, dendrite arm spacing, and mechanical properties between the laser-welded joints and SLMed samples, as well as variations among the different alloys.
3D PRINTING AND ADDITIVE MANUFACTURING
(2023)
Article
Optics
Yin Jie, Hao Liang, Yang Liangliang, Li Yan, Li Zheng, Sun Qinglei, Shi Bin
Summary: This research investigates the interaction between vapor plume and spatter behavior during SLM using a high spatial-temporal resolution in situ imaging system. The ejection processes and mechanisms of droplet spatter from the liquid base of the molten pool and powder spatter from the solid base of the substrate are revealed. The experimental measurements of vapor recoil pressure are in good agreement with theoretical calculations.
CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG
(2022)
