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Effect of Aging Parameters on Inconel 718 Fabricated by Laser Directed Energy Deposition

Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2023年第4期2卷 112-121页

作者： Nataniel Yong Syn Tham Grace Rui Si Tay Bingqing Yao Kaiqiang Wu ZhiLi Dong School of Materials Science and Engineering Nanyang Technological UniversitySingapore639798Singapore Advanced Remanufacturing and Technology Center(ARTC) Agency for ScienceTechnology and Research(A∗STAR)Singapore637143Singapore School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore639798Singapore

Inconel 718 is a nickel-based superalloy of high interest in high temperature applications such as turbine *** be used in such applications,heat treatments are commonly applied to dissolute Laves phase and to achieve𝛾γ′***,conventional heat treatment methods for wrought Inconel 718 may not be suitable for Inconel 718 fabricated by laser directed energy deposition(LDED)due to its unique microstructure formed during the rapid solidification *** has been a lack of investigation in heat treatments for Inconel 718 fabricated by this process,specifically around the impact of aging parameters on this *** this study,the effects of aging parameters were studied by performing seven different heat treatments,including solutionising and aging *** results indicate that for LDED Inconel 718,a high temperature solution treatment of 1100℃for 1 h followed by single aging at 650℃for 20 h achieved a tensile strength and elongation of 1247 MPa and 23%,***,results indicated that even with a shorter aging time of 10 h,γ′phase was found to be of comparable size to the standard double aged treatment.

关键词： Inconel 718 Laser directed energy deposition Heat treatment Microstructure Additive manufacturing

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Electrospun Biomass Polyethylene Furanoate Nonwoven Substrates for Flexible Thermoelectric Generators

SSRN

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SSRN 2024年

作者： Huang, Yi-Hsuan Chang, Yun Huang, Cheng-Jyun Lin, Jhih-Min Tung, Shih-Huang Jang, Guang-Way Liu, Cheng-Liang Department of Materials Science and Engineering National Taiwan University Taipei10617 Taiwan Material and Chemical Research Laboratories Industrial Technology Research Institute Hsinchu30011 Taiwan National Synchrotron Radiation Research Center Hsinchu30076 Taiwan Institute of Polymer Science and Engineering National Taiwan University Taipei10617 Taiwan Advanced Research Center for Green Materials Science and Technology National Taiwan University Taipei10617 Taiwan

Polyethylene furanoate (PEF) stands out as a highly promising biopolymer, characterized by its lower melting point and higher flexibility than those of polyethylene terephthalate (PET). Moreover, the enhanced functionality of PEF broadens its potential applications across various domains. Herein, the synergistic integration of PEF with a polymer thermoelectric layer is explored via the formulation of advanced environmentally sustainable materials for prospective utilization in flexible thermoelectric generators for the emerging field of green energy. The fabrication process involves the creation of PEF nonwoven via the electrospinning technique, thereby endowing the PEF with considerable stretchability. Concurrently, the polymer thermoelectric layer is developed by blending dimethyl sulfoxide (DMSO) and d-sorbitol in a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) solution, followed by drop-casting PEDOT:PSS onto glass substrates. Subsequently, free-standing PEDOT:PSS films are transposed onto PEF nonwoven substrates with a power factor of 17.84 μW m−1 K−2 and an elongation of 24% at breaking point. The intimate compatibility between the PEDOT:PSS film and PEF nonwoven substrate is demonstrated by the cyclic bending test results, wherein over 90% of the original conductivity is maintained after 1000 cycles, thereby highlighting the potential of the developed device as a thermoelectric generator. Finally, a 12-leg thermoelectric generator is fabricated, yielding an output voltage of 3.63 mV and an output power of 34.52 nW under a temperature gradient of 32.3 K. © 2024, The Authors. All rights reserved.

关键词： Substrates

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Microstructural Modeling and Multiscale Mechanical Properties Analysis of Cancellous Bone

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Computers, Materials & Continua 2020年第1期62卷 245-265页

作者： Zhiqiang Huang Yufeng Nie Yiqiang Li Research Center for Computational Science Northwestern Polytechnical UniversityXi’an710072China School of Applied Science Taiyuan University of Science and TechnologyTaiyuan030024China

This paper is devoted to the microstructure geometric modeling and mechanical properties computation of cancellous *** microstructure of the cancellous bone determines its mechanical properties and a precise geometric modeling of this structure is important to predict the material *** on the microscopic observation,a new microstructural unit cell model is established by introducing the Schwarz surface in this *** this model is very close to the real microstructure and satisfies the main biological characteristics of cancellous *** using the unit cell model,the multiscale analysis method is newly applied to predict the mechanical properties of cancellous *** effective stiffness parameters are calculated by the up-scaling multi-scale *** the distribution of microscopic stress in cancellous bone is determined through the down-scaling *** addition,the effect of porosity on the stiffness parameters is also *** predictive mechanical properties are in good agreement with the available experimental results,which verifies the applicability of the proposed unit cell model and the validness of the multiscale analysis method to predict the mechanical properties of cancellous bone.

关键词： Cancellous bone microstructural modeling multiscale analysis stiffness parameters stress distribution

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A dislocation-based model for cyclic plastic response of lath martensitic steels

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Acta Mechanica Sinica 2022年第2期38卷 110-118,I0004页

作者： Long Yu Wenbin Liu Haonan Sui Ying Liu Huiling Duan State Key Laboratory for Turbulence and Complex System Department of Mechanics ami Engineering ScienceBeijing Innovation Center for Engineering Science and Advanced Technology(BIC-ESAT)College of EngineeringPeking UniversityBeijing 100871China Key Laboratory of High Energy Density Physics Simulation(HEDPS) Center for Applied Physics and Technology(CAPT)and IFSACollaborative Innovation Center of MoEPeking UniversityBeijing 100871China

Softening behavior of lath martensitic steels is related to the coarsening of laths and dislocation evolution during cyclic *** the physical mechanism,we developed a dislocation-based model to study the cyclic plastic response for lath martensitic *** a block,we proposed an interfacial dislocation evolution model to physically present the interaction between mobile dislocations in the block and interfacial dislocations by considering the coarsening mechanism of the ***,the evolution behavior of backstress caused by dislocation pile up at the block boundary has been ***,a hierarchical model based on the elastic-viscoplastic self-consistent(EVPSC)theory is developed,which can realize the scale transition among representative volume element(RVE),prior austenite grains(PAGs)and *** to the proposed model,the effective mechanical responses including the cyclic hysteretic loop and peak stress at different cycles for lath martensitic steel have been theoretically predicted and investigated.

关键词： Lath martensitic steel Cyclic softening Hierarchical microstructure Lath coarsening Crystal plasticity

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Applications in Home Improvement Retailer, Koctas 2

Applications in Home Improvement Retailer, Koctas

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2nd International Conference on Business Analytics for technology and Security, ICBATS 2023

作者： Mourad, Nahia Raza, Hammad Amjad, Muhamamd Ullah, Muhammed Ubaid Sabri Elmitwally, Nouh University in Dubai College of Engineering & IT British Dubai United Arab Emirates College of Business Administration and Economics Department of Computer Science National Lahore Pakistan NCBA&E Lahore School of Computer Science Pakistan Applied Science Private University Applied Science Research Center Amman11937 Jordan Minhaj University Lahore Pakistan Birmingham City University School of Computing and Digital Technology BirminghamB4 7XG United Kingdom Cairo University Faculty of Computers and Artifcial Intelligence Department of Computer Science Giza12613 Egypt

ISBN: (纸本)9798350335644

It sounds like Koçtaş is a leader in the home improvement sector in Turkey, and they are focused on providing the best service and customer experience possible. They are also actively working to accelerate their digital investments and use their vast amount of customer data to innovate in the industry. One way they are using this data is by collecting and analyzing video camera images using AI. This allows them to detect humans and identify which products and shelves are most viewed in their stores. This information can then be used to optimize store layout and product placement for a better customer experience. Another way Koçtaş is innovating is through the implementation of kiosks that use Natural Language Processing (NLP) to interact with customers. These kiosks can understand and respond to questions asked by customers using AI, providing a more personalized and human-like ***, Koçtaş is using Dynamic Creative Optimization to create personalized advertisements for their customers. This method allows them to optimize the content and format of their ads based on the individual preferences and behavior of their customers, leading to more effective ***, Koçtaş is using technology and data to drive innovation and provide a better customer experience in the home improvement industry. © 2023 IEEE.

关键词： Video cameras

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Crossover equation of state based on color-molecular-dynamics

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Physical Review D 2024年第4期109卷 043056-043056页

作者： Nobutoshi Yasutake Toshiki Maruyama Department of Physics Chiba Institute of Technology 2-1-1 Shibazono Narashino Chiba 275-0023 Japan Advanced Science Research Center Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan

The equation of state for dense matter is studied with color molecular dynamics, in which hadron matter and quark matter are automatically distinguished only from quark color state. The quark-quark interactions are optimized to be consistent with saturation properties: symmetric energy, L-parameter, and incompressibility around nuclear density. In the calculations, the degrees of freedom of colors are solved at each numerical step, although the flavors are fixed as up or down quarks. The resultant mass-radius relations also satisfy the observational constraints such as the gravitational wave observations, NICER, and “the two-solar mass observations” of neutron stars. In this model with the allowed parameter range, deconfined quark matter appears in the core of neutron stars via crossover. Although the current constraints from the observations are not enough to conclude whether quark matter appears at high-density region and also our study is still in a qualitative level, our method would help to understand high-density material properties inside neutron stars in the future.

关键词： Nuclear astrophysics Nuclear matter in neutron stars QCD phase transitions Quark matter Quark model

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Cross-border issues and technology and management solutions during COVID-19

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Data science and Management 2023年第2期6卷 76-78页

作者： Jae Kyu Lee Shengsheng Huang Yasin Ceran Haibing Lu Shan Liu Wei Huang Jian Mou Bright Internet Research Center School of ManagementXi’an Jiaotong UniversityXi’an710049China Korea Advanced Institute of Science and Technology(KAIST) Daejeon34141South Korea College of Business University of Houston-VictoriaVictoria77901United States Leavey School of Business Santa Clara UniversitySanta Clara95053United States Business School Southern University of Science and TechnologyShenzhen518055China School of Business Pusan National UniversityBusan46241South Korea

Critical cross-border issues have emerged during the COVID-19 pandemic,especially pertaining to security,supply chain,and education,which has led to several new challenges for *** balance between potential risks and economic benefits has attracted the attention of both industry and ***,we invited three panelists to participate in the 2021 Association for Information Systems(AIS)Special Interest Group(SIG)on Information Systems in Asia Pacific(ISAP)*** suggested solutions include the right Internet approach,multi-national cooperation to develop flexible global operations,and people’s education(especially refugees)to mitigate *** solutions encompass three levels,i.e.,technology,management,and society.

关键词： Cross-border management COVID-19 pandemic Global management Information systems

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Laser-driven micro-pinch: a pathway to ultra-intense neutrons

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Nuclear science and Techniques 2025年第06期 203-208页

作者： Pu-Tong Wang Xue-Song Geng Guo-Qiang Zhang Liang-Liang Ji Yu-Gang Ma Shanghai Institute of Applied Physics Chinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai Advanced Research Institute Chinese Academy of Sciences Key Laboratory of Nuclear Physics and Ion-Beam Application (MOE) Institute of Modern Physics Fudan University

Utilizing the laser-driven Z-pinch e ect,we propose an approach for generating an ultrashort,intense Me V neutron source with femtosecond pulse *** self-generated magnetic field driven by a petawatt-class laser pulse compressed the deuterium in a single nanowire to more than 120 times its initial density,achieving an unprecedented particle number density of *** full-dimensional kinetic simulations,including nuclear reactions,we found that these Z-pinches can generate high-intensity and short-duration neutron pulses,with the peak flux reaching *** laser-driven neutron sources are beyond the capabilities of existing approaches and pave the way for groundbreaking applications in r-process nucleosynthesis studies and high-precision time-of-flight neutron data measurements.

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Self-rechargeable energizers for sustainability

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escience 2022年第4期2卷 347-364页

作者： JinKiong Ling Ria Kunwar Linlin Li Shengjie Peng Izan Izwan Misnon Mohd Hasbi Ab Rahim Chun-Chen Yang Rajan Jose Center for Advanced Intelligent Materials Universiti Malaysia Pahang26300KuantanPahang Faculty of Industrial Sciences and Technology Universiti Malaysia Pahang26300KuantanPahang College of Material Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing210016 Battery Research Center for Green Energy(BRCGE) Ming Chi University of Technology24301New Taipei City Department of Chemical Engineering Ming Chi University of Technology24301New Taipei City Department of Chemical and Materials Engineering Chang Gung UniversityKwei-shan333Taoyuan

Electrical energy generation and storage have always been complementary to each other but are often disconnected in practical electrical ***,efforts to combine both energy generation and storage into self-powered energizers have demonstrated promising power sources for wearable and implantable *** line with these efforts,achieving self-rechargeability in energy storage from ambient energy is envisioned as a tertiary energy storage(3rd-ES)*** review examines a few of the possible 3rd-ES capable of harvesting ambient energy(photo-,thermo-,piezo-,tribo-,and bio-electrochemical energizers),focusing also on the devices'*** self-rechargeability mechanisms of these devices,which function through modifications of the energizers’constituents,are analyzed,and designs for wearable electronics are also *** challenges for self-rechargeable energizers and avenues for further electrochemical performance enhancement are *** article serves as a one-stop source of information on self-rechargeable energizers,which are anticipated to drive the revolution in 3rd-ES technologies.

关键词： Batteries Supercapacitors Self-powered Textile electronics Yarns

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Ambient-Printed Methylammonium-Free Perovskite Solar Cells Enabled by Multiple Molecular Interactions

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advanced Energy Materials 2025年第0期

作者： Lang, Lei Ding, Zicheng Du, Yachao Wu, Nan Liu, Pengchi Qin, Ru Wang, Shuang Wang, Zhichao Tu, Yongchao Liu, Xiujie Zhang, Zheng Gong, Yongshuai Liu, Dongxue Zhao, Kui Liu, Shengzhong Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an710119 China Science and Technology Research Institute Three Gorges Corporation Beijing101199 China Key Laboratory of Photoelectric Conversion and Utilization of Solar Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Liaoning Dalian116023 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China

The ambient printing of high-performance and stable perovskite solar cells (PSCs) is crucial for enabling low-cost and energy-efficient industrial fabrication. However, producing high-quality perovskite films via ambient printing remains challenging due to direct exposure to air, which easily induces additional stacking defects and triggers perovskite degradation compared to films fabricated by traditional spin-coating under inert conditions. Here, a multiple molecular interaction strategy is introduced to address this challenge by incorporating a 2-thiazole formamidine hydrochloride (TC) additive, effectively suppressing defect formation during ambient printing. The specific interactions between TC and precursor components, i.e., multiple hydrogen bonds and coordination interactions, could promote the crystallization of α-phase perovskites and reduce cation and anion vacancies simultaneously when drying in air. These endows high-quality ambient-printed perovskite films with large crystalline grains with eliminated nanovoids and low trap-densities, which improve charge carrier dynamics and prevent perovskite decomposition and hydration under thermal/humidity stress during long-term annealing/ambient storage. The unencapsulated PSCs show a high efficiency of 23.72% with good stability, i.e., realizing 92% and 95% efficiency retention after 672 h of annealing at 85 °C in a N2 atmosphere and after 2088 h of storage in ambient air. © 2025 Wiley-VCH GmbH.

关键词： Hydrogen bonds

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