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Elemental decoration design with metastable cellular substructures for additively manufactured high-strength and high-corrosion resistant austenitic stainless steel

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Corrosion Communications 2024年第1期13卷 17-26页

作者： Decheng Kong Xin He Kunjie Dai Xiaoqing Ni Liang Zhang Li Wang Chaofang Dong Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and Technology University of Science and Technology Beijing Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming School of Materials Science and Engineering Shanghai Jiao Tong University Research and Application Center of Additive Manufacturing Materials Shanghai Research Institute of Materials Co.Ltd.

Multi-level chemical-structural heterogeneities extensively exist in additively manufactured(AM) metals due to the intrinsic layer-by-layer non-equilibrium solidification process. Strategies designed with particular metastable substructures aiming at advanced performances are significant for AM counterparts. In this work, Si and Mo additions are conducted based on the regulations of dislocation cell substructures and stacking fault energies for stainless steel(SS) 316L fabricated by laser powder bed fusion(PBF-LB). Their load-bearing performance and corrosion behavior are characterized. Results show that additional Mo segregation at cellular boundaries contributes a stronger strengthening effect than Si, which periodically hinders dislocation slip during deformation. Addition of Si triggers deformation twinning at an early stage due to decreased stacking fault energy, and subsequent dynamic Hall-Petch effects improve strain-hardening capability and plasticity for PBF-LB SS 316L + Si. Meanwhile, addition of Mo enhances pitting corrosion resistance of PBF-LB 316L + Mo SS in chloride-containing solutions, especially the pitting re-passivation, which is opposite in the Si addition case due to the increased quantiy of undesired Si/Mn-rich oxides. Underlying deformation and corrosion mechanisms for Mo/Si-added PBF-LB SSs are discussed. Our work is anticipated to motivate the alloy design concept based on particular metastable substructures for advanced AM alloys.

关键词： Dislocation cell Elemental segregation Laser powder bed fusion Austenitic stainless steel Alloy design Corrosion resistance

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Development of a Wearable Upper Limb Rehabilitation Robot Based on Reinforced Soft Pneumatic Actuators

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Chinese Journal of Mechanical Engineering 2022年第4期35卷 182-190页

作者： Xinbo Chen Shuai Zhang Kaibin Cao Chunjie Wei Wumian Zhao Jiantao Yao Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan UniversityQinhuangdao 066004China Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of National Education Yanshan UniversityQinhuangdao 066004China

Dyskinesia of the upper limbs caused by stroke,sports injury,or trafc accidents limits the ability to perform the activities of daily *** the necessary medical treatment,correct and scientifc rehabilitation training for the injured joint is an important auxiliary means during the treatment of the efected upper *** upperlimb rehabilitation robots have some disadvantages,such as a complex structure,poor compliance,high cost,and poor *** this study,a novel soft wearable upper limb rehabilitation robot(SWULRR)with reinforced soft pneumatic actuators(RSPAs)that can withstand high pressure and featuring excellent loading characteristics was *** by RSPAs,this portable SWULRR can perform rehabilitation training of the wrist and elbow *** this study,the kinematics of an SWULRR were analyzed,and the force and motion characteristics of RSPA were studied *** results provide a reference for the development and application of wearable upper limb rehabilitation *** experimental study on the rotation angle of the wrist and the pressure of the RSPA was conducted to test the efect of the rehabilitation training and verify the rationality of the theoretical *** process of wrist rehabilitation training was tested and evaluated,indicating that SWULRR with RSPAs will enhance the fexibility,comfort,and safety of rehabilitation *** work is expected to promote the development of wearable upper-limb rehabilitation robots based on modular reinforced soft pneumatic actuators.

关键词： Upper limb rehabilitation Reinforced soft pneumatic actuator Wearable rehabilitation robot Motion analysis

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Innovative design and optimization of a two-dimensional deployable nine-grid planar antenna mechanism with a flat reflection surface

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Chinese Journal of Aeronautics 2023年第11期36卷 529-550页

作者： Bo CHEN Ze JIANG Xinlu WEI Luyao GUO Xin ZHOU Yundou XU Junjie QIAN Yongsheng ZHAO Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan UniversityQinhuangdao 066004China Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of National Education Yanshan UniversityQinhuangdao 066004China Space Structure and Mechanism Technology Laboratory of China Aerospace Science and Technology Group Co.Ltd Shanghai 201109China Aerospace System Engineering Shanghai Shanghai 201109China

With the development of the aerospace industry,space missions are becoming more complicated and diversified,and there is a demand for antenna mechanisms with a larger physical *** this paper,a planar deployable mechanism is proposed,which can form a flat reflection surface with a small gap between *** this end,a novel large-scale two-dimensional deployable nine-grid planar antenna mechanism is ***,two antenna folding schemes and four supporting mechanism schemes are *** comparison analysis,the antenna configuration scheme with the best comprehensive performance is selected.A kinematic model of the deployable mechanism is established,and its kinematic characteristics are ***,the correctness of the kinematic model is verified by comparing the analytical and simulation results of the kinematic ***,a finite element model of the antenna is *** on the response surface method,the structural parameters of the support rods of the antenna are optimized,and a set of optimized solutions with lightweight and high fundamental frequency characteristics are ***,a prototype of the proposed nine-grid planar antenna is *** feasibility of the deployment principle and the rationality of the designed mechanism are verified by deployment experiments.

关键词： Design optimization Kinematics Planar antenna Structural design Two-dimensional expansion

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稀有金属材料与工程 2025年第2期54卷 311-318页

作者： Zhang Wenxin Zhang Xiankun Shi Lei Li Shengli Jiang Yuanning Wu Chuansong State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong UniversityJinan 250061China Key Laboratory for Liquid-Solid Structure Evolution&Processing of Materials Ministry of EducationShandong UniversityJinan 250061China

Friction stir lap welding of AA2195 Al-Li alloy and Ti alloy was conducted to investigate the formation,microstructure,and mechanical properties of the *** show that under different welding parameters,with the decrease in welding heat input,the weld surface is *** Ti/Al joint interface is flat without obvious Ti and Al mixed structure,and the hook structure is not formed under optimal *** to the enhanced breaking effect of the stirring head,the hook structural defects and intermetallic compounds are more likely to form at the Ti/Al interface at high rotational speed of 1000 r/min,thereby deteriorating the mechanical properties of *** the heat input is beneficial to hardness enhancement of the aluminum alloy in the weld nugget *** the optimal parameters of rotation speed of 800 r/min and welding speed of 120 mm/min,the maximum tensile shear strength of joint is 289 N/mm.

关键词： Ti/Al dissimilar welding friction stir lap welding Ti alloy Al-Li alloy interface bonding mechanical property

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Catalytic Degradation of Tetracycline by Core–Shell CoMn@NC Nanoparticles Via Enhanced Peroxymonosulfate Activation 9th

Catalytic Degradation of Tetracycline by Core–Shell CoMn@NC...

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9th International Conference on Advances in Energy and Environment Research, ICAEER 2024

作者： Bao, Yuankang Xu, Xun Xie, Dongbai Weifang Key Lab of Advanced Light Materials Manufacturing and Forming Weifang University of Science and Technology Shouguang China Jiangxi Key Laboratory of Materials Surface Engineering Jiangxi Science and Technology Normal University Nanchang China

ISBN: (纸本)9783031845703

This study synthesized core–shell structured CoMn@nitrogen-doped carbon (CoMn@NC) magnetic nanoparticles by annealing CoMn Prussian blue analog (PBA) precursors. The catalytic performance of the catalyst in activating peroxymonosulfate (PMS) to degrade tetracycline hydrochloride (TC) was investigated. Characterization of the catalyst using X-ray diffraction, and scanning electron microscopy revealed the presence of amorphous carbon, CoO, Co, and amorphous manganese species, with CoMn bimetallic particles encapsulated in nitrogen-carbon core–shell structures. At 25 °C and an initial pH of 6.2, with the addition of 50 mg/L catalyst and 200 mg/L PMS, complete degradation of 20 mg/L TC was achieved within 20 min. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Amorphous carbon

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Superb strength−ductility synergy in Si added metastable high-entropy alloys at cryogenic temperature via reinforced TRIP effect

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Transactions of Nonferrous Metals Society of China 2025年第3期35卷 872-887页

作者： Zhan-jiang LI Yi-xi HOU Li CHEN Qing-xin CHEN Jun-feng CHEN Fa CHANG Pin-qiang DAI Qun-hua TANG College of Materials Science and Engineering Fuzhou UniversityFuzhou 350116China College of Materials Science and Engineering Fujian University of TechnologyFuzhou 350118China Fujian Provincial Key Laboratory of New Material Preparation and Forming Technology Fuzhou 350118China Beijing Key Laboratory of Microstructure and Property of Advanced Materials Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China School of Mechanical&Electrical Engineering Putian UniversityPutian 351100China

The tensile behavior of(Fe_(50)Mn_(30)Co_(10)Cr_(10))_(100-x)Si_(x)(x=0(Si0),2(Si2))metastable HEAs prepared by selective laser melting was studied at cryogenic *** results demonstrate that the addition of Si leads to lattice distortion and a decrease in stacking fault energy,especially at 77 K,which significantly promotes transformation-induced plasticity(TRIP)in Si2 *** yield strength,tensile strength,and ductility of Si2 HEAs are 505.2 MPa,1364.1 MPa,and 19%,which are 43%,53% and 58% higher than those of Si0 alloy,*** is the main deformation mode,in addition to dislocation slip,and plays a key role in *** reinforced and continuously sustained TRIP maintains a dynamic strain distribution during *** strain hardening greatly enhances the strength and ductility.

关键词： Fe_(50)Mn_(30)Co_(10)Cr_(10)HEAs selective laser melting cryogenic temperature Si addition transformation-induced plasticity(TRIP)effect

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Effect of tempering temperature on microstructure and mechanical properties of 4Cr13VTi steel 9

Effect of tempering temperature on microstructure and mechan...

引用

2023 9th International Forum on Manufacturing technology and Engineering Materials, ICMTEM 2023

作者： Pan, Peng Wang, Jinnan Yang, Ming Beijing National Innovation of Lightweight Ltd. Beijing101400 China State Key Laboratory for Advanced Forming Technology and Equipment China Academy of Machinery and Technology Beijing101400 China

To optimize the tempering process of 40Cr13VTi steel containing V and Ti, the effect of tempering temperature on microstructure, precipitation, and properties of 40Cr13VTi stainless steel has been studied. Optical microscope (OM), scanning electron microscopy (SEM), and energy dispersive spectrometer (EDS) were used to analyze microstructure and precipitates. Tensile, impact, and hardness testing tests were performed to test the mechanical properties of 40Cr13VTi martensitic stainless steel. The research results indicate that as the increase of tempering temperature, the carbides precipitated gradually increase, and the shape gradually changes from particle to flake, which is consistent with the direction of the original martensite flat surface, and most of them concentrate at the martensite boundary. When the tempering temperature is 350°C, 40Cr13VTi martensitic stainless steel obtains the best comprehensive properties, strength, impact toughness (IT), and hardness which are 1360 MPa, 1717 MPa, 8.5 J/cm2, and 45.1 HRC respectively. © Published under licence by IOP Publishing Ltd.

关键词： Martensite

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Heterogeneous plastic deformation of stainless steel‑copper composites during multi-step micro deep drawing: experiment and modeling

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Journal of Manufacturing Processes 2025年 147卷 151-176页

作者： Qi, Yanyang Ma, Xiaoguang Jiang, Zhengyi Zhao, Jingwei College of Mechanical Engineering Taiyuan University of Technology Taiyuan030024 China Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment Ministry of Education Taiyuan030024 China National Key Laboratory of Metal Forming Technology and Heavy Equipment Ministry of Science and Technology Taiyuan030024 China School of Mechanical Materials Biomedical and Mechatronic Engineering University of Wollongong NSW2522 Australia

In the present study, laminated 316 L stainless steel - T2 copper composites (50 μm) were initially annealed at 800, 900 and 1000 °C for 5 min, respectively, to achieve diverse microstructural characteristics. Then the formability of stainless steel‑copper composites was investigated through numerical simulation and multi-step micro deep drawing (MMDD) tests, and the deformation law and forming mechanism during MMDD was analyzed. The finite element model, which incorporates material inhomogeneity and surface morphology, exhibits excellent consistency with the experiment results obtained from MMDD tests. The stainless steel‑copper composites annealed at 900 °C exhibit the best plasticity owing to the homogeneous and refined microstructure and texture structure in both stainless steel and copper matrixes, and the micro composite cup with specimen annealed at 900 °C exhibits a uniformly distributed and symmetrical height profile, uniform wall thickness as well as high drawing ratio and superior surface quality with the fewest wrinkles. Additionally, the formability of stainless steel‑copper composites during MMDD is significantly influenced by size effects, and the barrel-shaped micro composite cups manufactured by the second step of MMDD exhibit a considerably deteriorated forming quality compared with bowl-shaped products obtained by the first step of MMDD. The stainless steel exhibits uniform wall thickness distribution comparing to copper during MMDD, and the maximum thickening and the maximum thinning occur at the cup mouth region where the compressive stress is the highest and nose radius region where the tensile stress is the highest, respectively. © 2025 The Society of Manufacturing Engineers

关键词： Deep drawing

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Epitaxial growth of Cu_(2-x)Se on Cu(220)crystal plane as high property anode for sodium storage

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Chinese Chemical Letters 2024年第7期35卷 519-523页

作者： Zhijia Zhang Shihao Sun Yuefang Chen Yanhao Wei Mengmeng Zhang Chunsheng Li Yan Sun Shaofei Zhang Yong Jiang School of Materials Science and Engineering Institute of Quantum Materials and DevicesState Key Laboratory of Separation Membrane and Membrane ProcessesTiangong UniversityTianjin 300387China School of Chemistry and Life Sciences Suzhou University of Science and TechnologySuzhou 215009China Key Laboratory of Advanced Electrode Materials for Novel Solar Cells for Petroleum and Chemical Industry of China Suzhou University of Science and TechnologySuzhou 215009China Hebei Key Laboratory of Flexible Functional Materials/Hebei Key Laboratory of Material Near-Net Forming Technology School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuang 050018China

Three-dimentional(3D)transition metal selenides with sufficient channels could produce significant superiority on enhancing reaction kinetics for sodium-ion ***,the thorough exploration of 3D architecture with a facile strategy is still *** we report that a polycrystalline Cu_(2-x)Se film was epitaxial grown on(220)facets-exposed Cu by direct selenization of a nanoporous Cu skeleton,which is obtained by dealloying rolled Cu Mn@Cu alloy *** functional theory calculation result shows strong adsorption energy for Se atoms on Cu(220)planes during selenization reaction,rendering a low energy *** virtue of this core-shell 3D nanoporous architecture to offer abundant active sites and endow fast electron/ion transportation,the nanoporous Cu_(2-x)Se@Cu-0.15 composite electrode exhibits remarkable sodium-ion storage properties with high reversible capacity of 950.6μAh/cm^(2)at 50μA/cm^(2),suprior rate capability of 457.6μAh/cm^(2)at 500μA/cm^(2),as well as an ultra-long stability at a high current *** investigation reveals that the electrochemical reaction is a typical conversion-type reaction with different *** novel electrode synthetic strategy provides useful instructions to design the high-performance anode material for sodium-ion batteries.

关键词： Cu_(2)se 3D architecture Anode materials Density functional theory calculation Sodium-ion battery

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Additive Manufacturing of Nickel-Based Superalloy Single Crystals with IN-738 Alloy

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Acta Metallurgica Sinica(English Letters) 2022年第3期35卷 369-374页

作者： Yang Li Ye-Feng Yu Zhi-Bin Wang Xiao-Yu Liang Wen-Bin Kan Feng Lin Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology Ministry of Education of ChinaBeijing 100084China Bio-Manufacturing and Rapid Forming Technology Key Laboratory of Beijing Beijing 100084China

The production of non-weldable nickel-based superalloys,especially single-crystal superalloys,is important for additive ***-crystal specimens of non-weldable nickel-based superalloys were produced by electron beam selective melting using an IN-738 *** this study,single-crystal nickel-based superalloy specimens of diff erent sizes were prepared by a multiple preheating process and tight control of the melting parameters without the need for a grain selector or single-crystal seed for the first *** backscattered diff raction measurements were performed to confi rm the presence of a single *** transition boundaries between the polycrystalline and single-crystal regions at the edges and bottom of the samples were characterized to analyze the formation of single crystals.

关键词： Non-weldable superalloys Electron beam selective melting Single crystal Grain selection

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