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2024 5th International Conference on advanced Materials and Intelligent Manufacturing, IcamIM 2024

作者： Pan, Peng Ge, Feng Yang, Ming Yu, Jinxi Zuo, Lingli 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

Deform-3D software was used to analyse the forming characteristics of wear-resistant steel balls, material fluidity, stress-strain distribution, load-time curve, and break coefficient of three kinds of forging billets in the forging process. It was concluded that with the reduction of the height of the original billet, the damage coefficient of the middle position of the billet decreased during the final stage of billet forming. The forging ratio of the blank should be appropriately reduced to reduce the risk of forming defects in the forging process. 2025 Published under licence by IOP Publishing Ltd.

关键词： Billets (metal bars)

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Numerical Simulation and Experimental Investigation on Friction and Lubrication Behaviors of Chevron Micro-Textured Valve Plate/Cylinder Block Interface With Various Area Densities

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Journal of Tribology 2025年第7期147卷 072201页

作者： Chen, Luanxia Liu, Zhanqiang Huang, Haihong Zhu, Yingying School of Mechanical Engineering Hefei University of Technology Hefei230009 China Key Laboratory of Green Design and Manufacturing of Mechanical Industry Hefei University of Technology Hefei230009 China School of Mechanical Engineering Shandong University Jinan250061 China State Key Laboratory for High-end Equipment and Advanced Technology of Metal Forming Shandong University Jinan250061 China

As the critical friction pairs of swashplate-type axial piston pumps, the cylinder block/valve plate lubricating interface is the primary source of friction, wear, and leakage in axial piston pumps. Surface micro-texturing has been widely employed in cylinder block/valve plate conjunctions to ameliorate tribological performance. However, little research has been conducted to investigate the influence of chevron micro-texture area density on the tribological behaviors and lubricating properties of cylinder block/valve plate interface both experimentally and numerically. In this article, the chevron micro-textures with various area densities were manufactured on H62 brass by micro-milling and subsequently characterized with a laser scanning confocal microscope (LSCM). The friction and wear performance of H62 brass/38CrMoAl conjunctions were obtained via disc-on-disc tribological tests to simulate the cylinder block/valve plate lubricating interface. Moreover, the load-carrying capacity of untextured and chevron micro-textured samples was numerically investigated under hydrodynamic lubrication. It was found that the chevron micro-textured surface with an area density of 30.1% displayed the lowest friction coefficient and the shallowest wear depth. Although the load-carrying capacity of chevron micro-textured samples with a high dimple area density was larger, the severe stress concentration induced by the reduced micro-texture spacing caused the increment and large fluctuations of friction coefficient. Copyright © 2024 by ASME.

关键词： Friction

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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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Engineering design of feedstock powder and relevant thermal-mechanical performance of thermal/environmental barrier coatings

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Journal of advanced Ceramics 2025年第2期14卷 37-56页

作者： Xinchang Feng Fangwei Guo Lirong Luo Yuzhang Wang Yun Long Xiaofeng Zhao Fei Pan Lei Guo Qingfeng Zeng Jing Feng Chunlei Wan Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China National Engineering Research Center of Special Equipment and Power System for Ship and Marine Engineering Shanghai 200030China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Advanced Nuclear Energy Technology Nuclear Power Institute of ChinaChengdu 610213China Innovative Sensor Technology IST AG Ebnat-Kappel 9642Switzerland School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Tianmushan Laboratory Hangzhou 311115China School of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

The development of aeroengine with a high thrust-weight ratio poses great challenges for current top-coating thermal barrier coatings (TBCs) and environmental barrier coatings (EBCs) in service. Medium/high-entropy ceramics are highly promising candidate material for advanced TBCs/EBCs owing to their low thermal conductivity, high melting point, high-temperature stability, and calcium–magnesium–alumino–silicate (CMAS) resistance. Most feedstock powder used for medium/high-entropy TBCs/EBCs is prepared via traditional spray drying, which cannot fully exploit the advantages of multicomponent ceramics. The density, sphericity, inner structure, and flowability of feedstock powder affect their melting state during the thermal spraying process, which strongly affects the microstructure and properties of the deposited coatings. Therefore, the deposited coatings exhibit phase segregation, amorphous phases, and microstructure defects owing to unpredictable variations in feedstock powder with random morphologies and structures. Here, the structure and properties of feedstock powder prepared by state-of-the-art granulation technologies and their influences on the deposited coatings were systematically investigated, which can provide guidance for configuration optimization of feedstock powder and the manufacturing accuracy of the deposited coating. This review aims to bridge the gap between cutting-edge ceramics and advanced engineering technologies, thus providing concrete background knowledge and crucial guidelines for designing and developing TBCs/EBCs.

关键词： thermal/environmental barrier coatings(TBCs/EBCs) spraying ceramic powder multiscale structure control high-entropy ceramics thermal-mechanical performance

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Ultrasonic welding of thermoplastic composites with woven mesh energy directors: Enhanced strength and hygrothermal resistance

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Journal of Materials Research and technology 2025年 36卷 9699-9712页

作者： Dongsheng Yue Guoqun Zhao Jiaying Pan Jiaming Liu Dong Quan State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Jinan Shandong 250061 China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) Shandong University Jinan Shandong 250061 China

In ultrasonic welding of thermoplastic composites, energy directors (EDs) based on thermoplastic films often exhibit low heat generation efficiency and uneven temperature distribution at the welding interface, which negatively affect weld quality and joint strength. To address these limitations, this study introduces a novel plain-woven mesh ED for the ultrasonic welding of carbon fiber-reinforced PPS (CF/PPS) composites. The influence of welding amplitude and displacement on the welding process and joint quality was systematically investigated based on a single-lap shear test. Additionally, the moisture absorption behavior and mechanical performance degradation, and failure mechanisms of welded joints exposed to hydrothermal environments were also investigated. The results demonstrate that the uniform distribution of filament crossings and open areas in the mesh ED significantly enhances its deformation capability under ultrasonic vibration, leading to improved heat generation efficiency and more uniform temperature distribution at the welding interface. As a result, superior weld quality was achieved. By optimizing process parameters, a low defect level of 1.1 % and a maximum shear strength of 32.6 MPa was obtained for the welded joints. Furthermore, after aging at 80 °C and 95 % relative humidity for 12 weeks, the joint strength remained unchanged, demonstrating exceptional resistance to hygrothermal aging. These findings highlight the potential of mesh ED to overcome the limitations of traditional film-type ED, significantly enhancing both the performance and durability of ultrasonic-welded thermoplastic composite joints.

关键词： Thermoplastic composites (TPCs) Ultrasonic welding Energy director (ED) Environmental degradation Welding/joining

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On-orbit 3D bioprinting for tumor modeling in space

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Trends in Biotechnology 2025年

作者： Fang, Yongcong Hao, Wenshuai Xiong, Zhuo Department of Mechanical Engineering Tsinghua University Beijing100084 China State Key Laboratory of Tribology in Advanced Equipment Beijing100084 China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Beijing100084 China Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing Beijing100084 China Beijing100084 China

On-orbit 3D bioprinting offers a more accurate replication of complex tumor environments under space conditions than current 2D and 3D cell models. This technology holds great promise for uncovering regulatory pathways of tumorigenesis and tumor suppression in space, thus accelerating the development of innovative cancer treatments on Earth. © 2025 Elsevier Ltd

关键词： 3D bioprinting cancer therapeutics microgravity space oncology tumor modeling

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Optimized design of chip-breaking geometry of insert for the high-stability indexable insert drill 3

Optimized design of chip-breaking geometry of insert for the...

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3rd International Conference on Electrical, Electronics, and Information Engineering, EEIE 2024

作者： Jiang, Aisheng Wen, Juan Yu, RenChao Liu, Zhanqiang Wang, Shequan Zhao, Jinfu School of Mechanical Engineering Shandong University Jinan250061 China State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Jinan250061 China Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education Jinan250061 China Key National Demonstration Center for Experimental Mechanical Engineering Education Jinan250061 China Zhuzhou Diamond Cutting Tools Co. Ltd. Zhuzhou412007 China School of Mechanical Electrical & Information Engineering Shandong University Weihai264209 China

ISBN: (纸本)9781510688179

The chip morphology of indexable insert drills affects chip evacuation performance, which in turn influences the dimensional accuracy and surface quality of the workpiece. Simultaneously, the cutting force impacts the balance of radial forces, further affecting the dimensional accuracy and surface quality. Therefore, studying the effects of chip morphology and cutting force on the high stability applications of indexable insert drills is of significant importance. This paper proposes an optimized insert groove design for high-stability applications, focusing on cutting force and chip radius optimization. First, based on the cutting principles of indexable insert drills, insert groove parameters were selected, and an orthogonal experimental scheme was designed. key parameters affecting chip radius and cutting force were determined through simulation experiments. Second, the parameters were ranked by their influence on chip radius and cutting force, and the optimal parameter combinations were identified. Finally, the feasibility of the optimized insert groove design was verified through experiments. © The Authors.

关键词： Drills

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Adsorption behaviors of DNA nucleobases molecules on 2D Ti2N based materials: A DFT study

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Applied Surface Science 2025年 705卷

作者： Qarnain, Zul Qian, Zhao Shi, Feilong Wang, Chen Bi, Jianqiang Ahuja, Rajeev State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Jinan China Affiliated Hospital of Shandong Academy of Traditional Chinese Medicine Jinan China Condensed Matter Theory Materials Theory Division Department of Physics and Astronomy Uppsala University Uppsala Sweden

In this work, the adsorption behaviors of DNA nucleobases molecules on pristine, defective Ti2N and oxygen-functionalized Ti2NO2 have been investigated using the Density Functional Theory (DFT) within the framework of Van der Waals corrections. It is found that the pristine Ti2N has intense adsorption energy, which is decreased by approaches such as introducing Ti/N defects or attaching the oxygen functional group. Through studies of the equilibrium geometrical configurations, partial density of states, band structure, Bader charge analysis, charge density difference and work function, it is indicated that the adsorption strength of pristine Ti2N towards DNA nucleobases is stronger than defective Ti2N and Ti2NO2. While, in terms of decreasing the recovery time, Ti2NO2 is the best candidate among them for the sensing of DNA nucleobases. This theoretical work is proposed to provide guidance for experimentalists to develop better 2-D sensing materials to detect DNA nucleobases molecules for bio-medical applications in the future. © 2025 Elsevier B.V.

关键词： Van der Waals forces

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Enhanced wear resistance of a die steel via modification of the M7C3 and M23C6 carbides

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Wear 2025年 576-577卷

作者： Shen, Xinyu Peng, Mulan Fu, Hao Wei, Tongtao Wu, Hong Huang, Xiedong Li, Zulai Li, Lu Baker, Ian Shan, Quan Faculty of Material Science and Engineering Kunming University of Science and Technology Kunming650093 China State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China Thayer School of Engineering Dartmouth College HanoverNH03755-8000 United States National & Local Joint Engineering Laboratory for Technology of Advanced Metallic Solidification Forming and Equipment Kunming650093 China

Large volume fractions of carbides in die steels are a crucial source of high wear resistance. However, the inherent brittleness of micrometer sized carbides reduces the toughness, and can cause embrittlement and even premature failure of die steels. In this work, Cr8Mo2VSi die steel, a typical cold work die steel, has been modified by both reducing the volume fraction and refining the M7C3 carbides. The modified Cr8Mo2VSi die steel was produced via a 0.8 wt% reduction of Cr and a 5 % increase in deformation during composition design and rolling process, respectively. Increased aging-induced precipitation of M23C6 carbides in Cr8Mo2VSi can balance the negative effects of the M7C3 carbides, thereby toughening the die steel and extending its fatigue life. Moreover, M7C3 carbides are prone to peeling during wear because of their inherent brittleness, the stacking faults present, and the low interfacial adhesion. The modified Cr8Mo2VSi die steel exhibited superior toughness and fatigue performance and high wear resistance not only due to the increased participation of M23C6 carbides, but also because of the increased number of high-angle grain boundaries resulting from increased deformation. This study aims to provide guidance for the toughening of die steels with high-carbide contents. © 2025 Elsevier B.V.

关键词： Stacking faults

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Control over Mechanical Properties and Microstructure of BR1500HS Hot-stamped Parts

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Journal of Iron and Steel Research International 2014年第6期21卷 606-613页

作者： Bai-liang ZHUANG Zhong-de SHAN Chao JIANG Xin-ya LI State Key Laboratory of Advanced Forming Technology and Equipment of CAM Jiangsu Institute China Academy of Machinery Science and Technology

The hot stamping processing parameters are of critical importance in transforming ultra-high-strength steel （UHSS） into high-quality parts, which were studied by mechanical properties tests, metallographic observations and calculation analysis method based on hot stamping experiments and numerical simulation technology, the mechanical properties, thickness, dimensional accuracy, and microstructure of the hot formed parts are analyzed to determine the influence of different processing parameters for UHSS parts formed from BR1500HS. The results indicate that the quenching time had the most significant impact on the mechanical properties of the parts, and longer quenching time resulted in better mechanical properties. In addition, the pressing speed had a significant influence on the thick ness of the formed parts, and the part-opening temperature had the most significant effect on the dimensional accura cy of the parts. And to get hot stamped parts with excellent quality, the optimum process conditions should be set as heating temperature of 930 ℃, soaking time of 4 min, stamping force of 7 MPa, pressing speed of 75 mm/s, quench ing time of 15 s, and water-flow rate of 1.1 m/s.

关键词： hot forming processing parameter mechanical property microstructure

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