Search results for: Qingsong Wei

Items from 1 to 20 out of 75 results

article

Multiple Electron Transfer in Semiconductive Ternary D‐D'‐A Metal‐Organic Framework for Enhanced X‐Ray Detection and Imaging

Qingsong Wei, Jingyan Liu, Liang Wu, Fuhai Chen, more

Small > 20 > 40 > n/a - n/a

Semiconductive metal–organic frameworks (MOFs) with donor–acceptor (D–A) characteristics have garnered attractive attention due to their capacity for separating and transferring photogenerated charges, making them promising candidates for high‐performance X‐ray detectors. However, the low charge transfer efficiency between the metal nodes and organic ligands limits the X‐ray‐to‐electricity conversion...

article

Halogen‐bonding boosting the high performance X‐ray imaging of organic scintillators

Hongming Chen, Miao Lin, Yanan Zhu, Dongwei Zhang, more

Small > 20 > 14 > n/a - n/a

Organic scintillators with efficient X‐ray excited luminescence are essential for medical diagnostics and security screening. However, achieving excellent organic scintillation materials is challenging due to low X‐ray absorption coefficients and inferior radioluminescence (RL) intensity. Herein, supramolecular interactions are incorporated, particularly halogen bonding, into organic scintillators...

article

Material–Structure–Function Integrated Additive Manufacturing of Degradable Metallic Bone Implants for Load‐Bearing Applications

Danlei Zhao, Keda Yu, Tingfang Sun, Xirui Jing, more

Advanced Functional Materials > 33 > 16 > n/a - n/a

The integration of bio‐adaptable performance, elaborate structure, and biological functionality for degradable bone implants is crucial in harnessing the body's regenerative potential to remold load‐bearing bone defects. Herein, material–structure–function integrated additive manufacturing (MSFI‐AM) is deployed to innovate novel zinc‐based bone implants, namely Zn–Mg–Cu alloy. In situ alloying of...

article

Fused deposition modeling of poly (lactic acid)/almond shell composite filaments

Xiaohui Song, Wei He, Peiqi Chen, Qingsong Wei, more

Polymer Composites > 42 > 2 > 899 - 913

In this paper, poly (lactic acid)/almond shell powder (PLA/ASP) composite filaments were prepared using the fused deposition modeling (FDM) method. The influence of chemical treatments on the chemical groups of ASP was determined, and the effects of material ratios (3, 5, 10, and 15 wt%) and sliane concentration (2, 4, 6, and 8 wt%) on thermal and mechanical properties of the composites were investigated...

article

Comparisons on microstructure, mechanical and corrosion resistant property of S136 mold steel processed by selective laser melting from two pre-alloy powders with trace element differences

Yan Zhou, Longchen Duan, Xiantai Ji, Shifeng Wen, more

Optics & Laser Technology > 2018 > 108 > C > 81-89

Selective laser melting (SLM) method has a great potential for fabricating injection mold with complex structure. In this study, two S136 mold steel pre-alloy powders with trace element difference were fabricated by SLM, and then comparison of samples on microstructure, mechanical and corrosion resistant property was investigated. Results showed that the sample fabricated with a higher Si+Mn content...

article

High-Temperature Properties and Microstructural Stability of the AISI H13 Hot-Work Tool Steel Processed by Selective Laser Melting

Mei Wang, Wei Li, Yan Wu, Shuai Li, more

Metallurgical and Materials Transactions B > 2019 > 50 > 1 > 531-542

The microstructural stabilities, softening resistance, and high-temperature tensile properties of the H13 hot-work tool steel by selective laser melting (SLM) were systematically studied. A series of tempering procedures were performed on the as-SLMed specimens. Afterwards, the mechanism of softening resistance behavior was discussed based on the XRD, SEM, EBSD observations, hardness measurements,...

article

Enhanced hardness and wear property of S136 mould steel with nano-TiB2 composites fabricated by selective laser melting method

Shifeng Wen, Hui Hu, Yan Zhou, Zhiping Chen, more

Applied Surface Science > 2018 > 457 > C > 11-20

S136 mould steel with excellent corrosion resistance has been widely applied in the mould industry. However, in order to meet the increasing demands of injection products with complex structure and high quality, selective laser melting (SLM) as a novel manufacturing method is chosen due to its rapid fabricating parts with complex geometric shapes. Further, it is essential to enhance their hardness...

article

Enhanced compressive strength and tailored microstructure of selective laser melted Ti-46.5Al-2.5Cr-2Nb-0.5Y alloy with different boron addition

Wei Li, Ming Li, Yi Yang, Qingsong Wei, more

Materials Science and Engineering: A > 2018 > 731 > C > 209-219

The microstructures and compressive properties of Ti-46.5Al-2.5Cr-2Nb-0.5Y alloy with varied boron (B) addition processed by selective laser melting (SLM) had been systematic studied. With increasing the B content from 0 to 2 wt%, the average grain size of SLM-processed Ti-46.5Al-2.5Cr-2Nb-0.5Y/B composites decreased from 16.64 µm to 5.66 µm, meanwhile, the {0001} texture index and high angle grain...

article

Effect of scan line spacing on texture, phase and nanohardness of TiAl/TiB2 metal matrix composites fabricated by selective laser melting

Yi Yang, Shifeng Wen, Qingsong Wei, Wei Li, more

Journal of Alloys and Compounds > 2017 > 728 > C > 803-814

The TiAl/TiB₂ metal matrix composites (MMCs) are fabricated by selective laser melting (SLM), and the effects of scan line spacing on the grains feature, crystallographic texture, phases evolution mechanism and nanohardness have been systematic studied. With the increase of scan line spacing, relatively coarse grains with average grain size of 4.9 ± 0.2 μm and strong (0001) orientation gradually...

article

Flow behavior of powder particles in layering process of selective laser melting: Numerical modeling and experimental verification based on discrete element method

Hui Chen, Qingsong Wei, Shifeng Wen, Zhongwei Li, more

International Journal of Machine Tools and Manufacture > 2017 > 123 > C > 146-159

Powder-layering is an essential process of selective laser melting (SLM), but the underlying mechanisms of powder movement and packing at particle scale is unclear. Based on discrete element method (DEM), this study proposed a numerical model to investigate the flowing behavior of powder layered by a blade, where the contact force and cohesion force between individual particles were considered. DEM...

article

Integral method of preparation and fabrication of metal matrix composite: Selective laser melting of in-situ nano/submicro-sized carbides reinforced iron matrix composites

Bo Song, Zhiwei Wang, Qian Yan, Yuanjie Zhang, more

Materials Science and Engineering: A > 2017 > 707 > C > 478-487

This paper presents a study on the formation, microstructure and mechanical property of Cr₃C₂/Fe nanocomposites using selective laser melting (SLM). Scanning electron microscope (SEM), transmission electron microscope (TEM) and tensile tests were conducted to investigate the influence of Cr₃C₂ particulates on the microstructure and mechanical properties. It was found that the porosity decreased when...

article

Enhanced nanohardness and new insights into texture evolution and phase transformation of TiAl/TiB2 in-situ metal matrix composites prepared via selective laser melting

Wei Li, Yi Yang, Jie Liu, Yan Zhou, more

Acta Materialia > 2017 > 136 > C > 90-104

TiAl/TiB₂ in-situ metal matrix composites (MMCs) with greatly enhanced nanohardness are prepared via selective laser melting (SLM) for the first time in this study. The effect of TiB₂ reinforcement on the microstructural characteristics, texture evolution and phase transformation of TiAl-based alloy is investigated. The results show that with increasing the TiB₂ content, the average grain size gradually...

article

Effect of Nb content on microstructure, property and in vitro apatite-forming capability of Ti-Nb alloys fabricated via selective laser melting

Qian Wang, Changjun Han, Tomasz Choma, Qingsong Wei, more

Materials & Design > 2017 > 126 > C > 268-277

Ti-Nb alloys were in-situ fabricated by selective laser melting (SLM) to study the effect of Nb content on their phase transformation, microstructure evolution, mechanical properties and in vitro apatite-forming capability. Results show that α' martensite and β (Ti, Nb) phase are obtained in SLM-processed Ti-Nb alloys. The increase of Nb content results in the increase of β phase amount but decrease...

article

Hot isostatic pressing of in-situ TiB/Ti-6Al-4V composites with novel reinforcement architecture, enhanced hardness and elevated tribological properties

Chao Cai, Bo Song, Chunlei Qiu, Lifan Li, more

Journal of Alloys and Compounds > 2017 > 710 > C > 364-374

In this study, titanium borides reinforced Ti-6Al-4V composites have been successfully prepared by hot isostatic pressing (HIPing). The microstructure of the as-fabricated samples was investigated using X-ray diffraction technique, secondary electron microscopy and electron backscatter diffraction and the mechanical properties evaluated through micro-hardness and wear resistance measurements together...

article

Microstructure and property evolutions of titanium/nano-hydroxyapatite composites in-situ prepared by selective laser melting

Changjun Han, Qian Wang, Bo Song, Wei Li, more

Journal of the Mechanical Behavior of Biomedical Materials > 2017 > 71 > C > 85-94

Titanium (Ti)-hydroxyapatite (HA) composites have the potential for orthopedic applications due to their favorable mechanical properties, excellent biocompatibility and bioactivity. In this work, the pure Ti and nano-scale HA (Ti-nHA) composites were in-situ prepared by selective laser melting (SLM) for the first time. The phase, microstructure, surface characteristic and mechanical properties of...

article

Microstructural and surface modifications and hydroxyapatite coating of Ti-6Al-4V triply periodic minimal surface lattices fabricated by selective laser melting

Chunze Yan, Liang Hao, Ahmed Hussein, Qingsong Wei, more

Materials Science and Engineering: C > 2017 > 75 > C > 1515-1524

Ti-6Al-4V Gyroid triply periodic minimal surface (TPMS) lattices were manufactured by selective laser melting (SLM). The as-built Ti-6Al-4V lattices exhibit an out-of-equilibrium microstructure with very fine α′ martensitic laths. When subjected to the heat treatment of 1050°C for 4h followed by furnace cooling, the lattices show a homogenous and equilibrium lamellar α+β microstructure with less dislocation...

article

Texture evolution, phase transformation mechanism and nanohardness of selective laser melted Ti-45Al-2Cr-5Nb alloy during multi-step heat treatment process

Wei Li, Jie Liu, Yan Zhou, Shifeng Wen, more

Intermetallics > 2017 > 85 > C > 130-138

This paper for the first time systematic study the effect of heat treatment on the grains characteristics, texture evolution, phases transformation mechanism and nanohardness of Ti-45Al-2Cr-5Nb (at.%) alloy processed by selective laser melting (SLM). With increasing the annealing temperature, the grain size generally increases while the crystallographic orientations basically remain unchanged. The...

article

Effect of laser scanning speed on a Ti-45Al-2Cr-5Nb alloy processed by selective laser melting: Microstructure, phase and mechanical properties

Wei Li, Jie Liu, Yan Zhou, Shuai Li, more

Journal of Alloys and Compounds > 2016 > 688 > PB > 626-636

This work presents a comprehensive study on the laser scanning speed on the microstructure development, phase evolution and nanohardness of a TiAl alloy, Ti-45Al-2Cr-5Nb (at.%), processed by selective laser melting (SLM). The experimental results show that when increasing the laser scanning speed from 500 to 800 mm/s, the average grains size decreases from 7.11 μm to 5.43 μm, whereas the crystallographic...

article

Effect of hot isostatic pressing procedure on performance of Ti6Al4V: Surface qualities, microstructure and mechanical properties

Chao Cai, Bo Song, Pengju Xue, Qingsong Wei, more

Journal of Alloys and Compounds > 2016 > 686 > C > 55-63

The effects of two different procedures (SL: simultaneous loading, AL: asynchronous loading) on the surface qualities, microstructure and mechanical properties of Ti6Al4V alloy part during hot isostatic pressing (HIP) were investigated. It was found that, in AL process, the surface qualities significantly improved. Both of microstructure were composed of equiaxed grains and lamellar structure, as...

article

Effect of Tooling Material on the Internal Surface Quality of Ti6Al4V Parts Fabricated by Hot Isostatic Pressing

Chao Cai, Bo Song, Qingsong Wei, Wu Yan, more

Metallurgical and Materials Transactions A > 2017 > 48 > 1 > 34-38

For the net-shape hot isostatic pressing (HIP) process, control of the internal surface roughness of as-HIPped parts remains a challenge for practical engineering. To reveal the evolution mechanism of the internal surface of the parts during the HIP process, the effect of different tooling materials (H13, T8, Cr12 steel, and graphite) as internal cores on the interfacial diffusion and surface roughness...

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INFONA - science communication portal

Search results for: Qingsong Wei

Multiple Electron Transfer in Semiconductive Ternary D‐D'‐A Metal‐Organic Framework for Enhanced X‐Ray Detection and Imaging

Halogen‐bonding boosting the high performance X‐ray imaging of organic scintillators

Material–Structure–Function Integrated Additive Manufacturing of Degradable Metallic Bone Implants for Load‐Bearing Applications

Fused deposition modeling of poly (lactic acid)/almond shell composite filaments

Comparisons on microstructure, mechanical and corrosion resistant property of S136 mold steel processed by selective laser melting from two pre-alloy powders with trace element differences

High-Temperature Properties and Microstructural Stability of the AISI H13 Hot-Work Tool Steel Processed by Selective Laser Melting

Enhanced hardness and wear property of S136 mould steel with nano-TiB2 composites fabricated by selective laser melting method

Enhanced compressive strength and tailored microstructure of selective laser melted Ti-46.5Al-2.5Cr-2Nb-0.5Y alloy with different boron addition

Effect of scan line spacing on texture, phase and nanohardness of TiAl/TiB2 metal matrix composites fabricated by selective laser melting

Flow behavior of powder particles in layering process of selective laser melting: Numerical modeling and experimental verification based on discrete element method

Integral method of preparation and fabrication of metal matrix composite: Selective laser melting of in-situ nano/submicro-sized carbides reinforced iron matrix composites

Enhanced nanohardness and new insights into texture evolution and phase transformation of TiAl/TiB2 in-situ metal matrix composites prepared via selective laser melting

Effect of Nb content on microstructure, property and in vitro apatite-forming capability of Ti-Nb alloys fabricated via selective laser melting

Hot isostatic pressing of in-situ TiB/Ti-6Al-4V composites with novel reinforcement architecture, enhanced hardness and elevated tribological properties

Microstructure and property evolutions of titanium/nano-hydroxyapatite composites in-situ prepared by selective laser melting

Microstructural and surface modifications and hydroxyapatite coating of Ti-6Al-4V triply periodic minimal surface lattices fabricated by selective laser melting

Texture evolution, phase transformation mechanism and nanohardness of selective laser melted Ti-45Al-2Cr-5Nb alloy during multi-step heat treatment process

Effect of laser scanning speed on a Ti-45Al-2Cr-5Nb alloy processed by selective laser melting: Microstructure, phase and mechanical properties

Effect of hot isostatic pressing procedure on performance of Ti6Al4V: Surface qualities, microstructure and mechanical properties

Effect of Tooling Material on the Internal Surface Quality of Ti6Al4V Parts Fabricated by Hot Isostatic Pressing

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