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Effect of austenitizing temperature on martensitic transformation in SA508Gr.4N steel

Journal of materials science & Technology 2024年第19期186卷 244-255页

作者： Shumeng Lu Li Wan Shanju Zheng Mengnie Li Juanna Ren Baosheng Liu Manal F.Abou Taleb Zeinhom M.El-Bahy Zhongdong Xu Xiaojing Wang Mohamed M.Ibrahim Zhanhu Guo Faculty of Material Science and Engineering Kunming University of Science and TechnologyKunming 650093China Department of Materials Science and Engineering Inner Mongolia Zhongsheng Engineering Technology Co.Ltd.Alashan 750300China Department of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle Upon TyneNE18STUK Department of Chemistry College of Science and Humanities in Al-KharjPrince Sattam Bin Abdulaziz UniversityAl-Kharj11942Saudi Arabia Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr City 11884CairoEgypt Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia

SA508Gr.4 N steel is commonly used in nuclear pressure vessels. The current study discloses the impact of austenitizing temperature on its martensitic transformation. Various austenitizing temperatures were employed to examine the martensitic transformation at different experimental conditions. The characteristics of grain boundaries, microstructure, transformation kinetics, and crystallography of the martensitic phase following the austenitizing process and martensitic transformation were analyzed. Austenitizing temperatures had minimal effects on the critical temperature of the austenitizing phase transition. However, an increase in austenitizing temperature resulted in larger grain sizes. The phase composition primarily consisted of lath martensite, accompanied by a small amount of residual austenite (RA). As the austenitizing temperature increased, the temperature of martensite-start temperature (Ms) initially decreased and then increased. On the other hand, the temperature of martensite-finish (Mf) showed no significant sensitivity to changes in the austenitizing temperature. Moreover, the average size of the lath martensite structure was increased, and there was an increased tendency for variant selection as the austenitizing temperature increased, and the combination of specific orientation relationships appeared. This study is very valuable for revealing the microstructure evolution at different temperatures.

关键词： SA508Gr.4 N steel Austenitizing temperature Martensitic transformation Microstructures characteristics

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Parameter Identification of Nonlinear Systems Using Generalized Associated Linear Equations (GALEs) 6

Parameter Identification of Nonlinear Systems Using Generali...

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6th International Conference on Industrial Artificial Intelligence, IAI 2024

作者： Zhang, Wenbo Guo, Xiaoyue Zhang, Bo Zhu, Yunpeng Cheng, Liangliang Peng, Zhike School of Mechanical Engineering Ningxia University Yinchuan China School of Engineering and Material Science Queen Mary University of London London United Kingdom Engineering and Technology InstituteGroningen University of Groningen Faculty of Science and Engineering Groningen Netherlands

ISBN: (纸本)9798350356618

For a weakly nonlinear system described by Volterra series, if the nonlinear differential equation (NDE) model of the system is unique, the nonlinear auto-regressive with exogenous input (NARX) model identified based on the input and output data of that system is not unique. Fortunately, the NDE model and the NARX model of the same nonlinear system have unique frequency domain representations, e.g., generalized frequency response functions (GFRFs), so these two models also have the same nonlinear output response spectrum. And the generalized associated linear equations (GALEs) theory can be used to directly calculate the arbitrary order nonlinear output response of the system according to the parameters of the NDE model or the NARX model. Therefore, this paper proposes a parameter identification method of the NDE model for the nonlinear system based on GALEs. Firstly, the NARX model of the system is identified according to the input and output data generated by the NDE model of the system with unknown parameters. Secondly, the GALEs of the NDE model containing the unknown parameters are determined. Finally, the unknown parameters in the NDE model are identified based on the principle that the NDE model and the NARX model of the same system have the same nonlinear output response spectrum. The method is convenient and effective, and provides a new idea for parameter identification of NDE models of nonlinear systems. © 2024 IEEE.

关键词： Frequency domain analysis

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Bionic Flexible Texture Design Based on Bio-Fouling Suppression Effect for Protection of Marine Structures

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China Ocean engineering 2023年第5期37卷 842-848页

作者： YI Peng WU Yu-peng CAI Bao-ping TIAN Xing-hui Javad MOSTAGHIMI YANG Xiao-shuang LYU Ming-li College of Mechanical and Electrical Engineering China University of PetroleumQingdao 266580China Department of Mechanical and Industrial Engineering University of TorontoToronto ONM5S3G8Canada Qingdao Yongzhao New Material Science&Technology Co.Ltd. Qingdao 266061China

Marine equipments such as marine risers and oil pipelines operate in complex underwater environments and are usually attached by animals,plants and *** attachment of marine fouling organisms will accelerate the corrosion damage of offshore structure and greatly reduce the service *** have shown that non-smooth bionic surfaces with specific microstructures can inhibit fouling *** on the idea of bionics,this paper proposes a new type of underwater flexible fretting texture,which is a composite material prepared by mixing graphene and silicone rubber,and modified by pulsed laser to construct a hexagonal bionic surface *** the impact of specific water flow,the flexible texture can produce an angular displacement around 8°and a linear displacement in the amplitude range of 165μm,and the inhibition rate of fouling biological diatoms up to 97.5%,which can effectively avoid the occurrence of marine biological *** results provide a new idea for the surface protection of marine structures,which is of great significance for the development of marine industry.

关键词： flexible microstructure marine antifouling algae attachment laser-induced texture

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Preparation of NiTip/Al composites with controllable phase transformation and damping behavior by friction stir processing

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science China(Technological sciences) 2024年第2期67卷 597-607页

作者： WU Xiao JIANG HongJie LI WangYun LIU ChongYu HUANG HongFeng LIU ShuHui WEI LiLi School of Material Science and Engineering Guilin University of Technology Guilin 541004China Key Laboratory of New Processing Technology for Nonferrous Metal&Materials Ministry of EducationGuilin University of Technology Guilin 541004China School of Mechanical and Electrical Engineering Guilin University of Electronic TechnologyGuilin 541004China

The NiTip/1060Al composites were prepared using a pre-aging and friction stir method(FSP)to enhance the low-temperature damping performance of the aluminum alloy and accommodate various service *** bonding between NiTi particles and the 1060Al matrix is well established after FSP,and no new phases are formed in the *** phasetransformation peak temperature of NiTip/1060Al composites gradually shifts to lower temperatures with increased aging temperature of NiTi *** room temperature,the 550℃-NiTip/1060Al composite exhibits superior damping performance,with an internal friction value 144%higher than that of the FSP-1060Al ***,at-91℃,the 650℃-NiTip/1060Al composite demonstrates better damping performance,with an internal friction value 158%higher than that of the FSP-1060Al *** NiTip/1060Al composites exhibit the internal friction peak of NiTi phase-transformation in the temperature range from-91℃to 60℃.This characteristic results in significantly better damping performance compared to the FSP-1060Al alloy and other high-damping aluminum matrix composites.

关键词： NiTi particle aluminum matrix composites phase transformation damping behavior friction stir processing

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Research on the macro-and meso-mechanical properties of frozen sand mold based on Hertz-Mindlin with Bonding model

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Particuology 2024年第5期88卷 176-191页

作者： Jianpei Shi Zhongde Shan Haoqin Yang College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China College of Material Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China

In this study,macro-and meso-mechanical properties of frozen sand molds were discussed based on the Hertz-Mindlin with Bonding(HMB)***-Burman,steepest ascent,and central composite designs were utilized to propose a parameter calibration *** effects of mesoscopic parameter variations on the compressive strength and average gradient of stress-strain were investigated through response surface method *** showed that the relative error between the simulated and measured repose angle is 3.1%under calibrated intrinsic contact *** compressive strength and average stress-strain gradient primarily depend on the normal and shear stiffness per unit area,as well as the particle size and porosity of the silica ***,taking load-displacement curves of three frozen sand molds with different geometric characteristics as the target value,the reliability and effectiveness of the frozen sand mold HMB model were verified through uniaxial compression tests and discrete element simulations.

关键词： Frozen sand mold Hertz-Mindlin with Bonding model Uniaxial compression test Discrete element method mechanical properties

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Influence of deformation zone length on bending radius of SS304 tubes with small diameters manufactured via free bending-based active motion

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Chinese Journal of Aeronautics 2023年第6期36卷 420-434页

作者： Shenghan HU Cheng CHENG Ali Abd EL-ATY Shuo ZHENG Xunzhong GUO Chunmei LIU Jie TAO College of Material Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 21ll00China Department of Materials Science and Engineering&RIAM Seoul National UniversityI-Gwanak-roGwanakguSeoul 08826Republic of Korea Mechanical Engineering Department Faculty of Engineering-HelwanHelwan UniversityCairo 11795Egypt

In three and six-axis free-bending equipment,the deformation zone length(A)is a fixed mechanical structure parameter modified when the relevant structure is redesigned and *** this study,a six degree of freedom(6-DOF)parallel mechanism was used as the control mechanism of the bending die,and a new method of changing the deformation zone length(A)was ***,an idealized geometric model of free bending-based active motion was ***,the influence of the deformation zone length(A)on the bending moment and the bending radius of the tube was *** addition,the finite element simulation and a kinematic model of free bending-based active motion controlled by the 6-DOF parallel mechanism were established,and bending processes of the SS304 tube with different deformation zone lengths were ***,the impact of the deformation zone length(A)on the bending radius,bending moment,wall thickness,and motion of the parallel mechanism were ***,experiments were carried out on the free-bending equipment based on the 6-DOF parallel *** verified the rules in the theoretical analysis,finite element simulation,and kinematic simulation.

关键词： Bending radius Deformation zone length 6-DOF parallel mechanism Free bending-based active motion Small diameter tube

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Study on frictional behavior of SiC_(f)/SiC composite clad tube clamping condition under nuclear irradiation

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Friction 2024年第5期12卷 919-938页

作者： Chenglong XIAO Liangliang SHEN Tianqi ZHU Jianbo TANG Ximing XIE Xinyu FAN Jian XU Zhiying REN School of Mechanical Engineering Zhejiang University of TechnologyHangzhou310023China Engineering Laboratory of Advanced Energy Materials Ningbo Institute of Material Technology and EngineeringChinese Academy of SciencesNingbo315201China State Key Laboratory of Fine Chemicals Liaoning High-Performance Polymer Engineering Research CenterSchool of Chemical EngineeringDalian University of TechnologyDalian116024China School of Mechanical Engineering and Automation Fuzhou UniversityFuzhou350116China School of Computer Science and Technology Shandong UniversityQingdao266237China Aviation Industry Corporation of China Ltd.Beijing100028China

Silicon carbide fiber reinforced silicon carbide matrix(SiC_(f)/SiC)composite is the key cladding material of nuclear fuel,which determines the safety and reliability of nuclear fuel storage and *** replacement of its storage and transportation scenario needs to be completed by the manipulator,but the application of SiC_(f)/SiC wear,fracture,and nuclear leakage in the snatching process of brittle-flexible-rigid contact in the irradiation environment has been seriously restricted due to unclear understanding of the damage ***,the effects of irradiation dose and clamping load on the friction characteristics of the contact interface between SiC_(f)/SiC clad tube are studied in this paper,and the effects of irradiation parameters and clamping force on the static friction coefficient of the contact interface between the clad tube and flexible nitrile are *** on the Greenwood-Williamson tribological model,a numerical model of the shape and structure of the contact micro-convex at the micro-scale of the clamping interface is constructed by introducing the multi-surface integral,and finally verified by *** research results show that there is a unique“Irradiation suppression zone”under the clamping condition of SiC_(f)/SiC cladding tube under the nuclear irradiation environment,and the growth of static friction coefficient slows down until stagnates after irradiation reaches a certain extent(600 kGy),and there will be a decline when the irradiation dose continues to increase,among which the clamping force of 15.2 N within the irradiation interval of 1,000 kGy can meet the safety of nuclear environment *** results of this paper can provide an important theoretical basis and application guidance for the safe operation of SiC_(f)/SiC cladding tubes in the storage and transportation clamping process.

关键词： SiC_(f)/SiC Clad tube nuclear irradiation conditions Greenwood-Williamson tribological model multi-surface integral

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Damping performance of SiC nanoparticles reinforced magnesium matrix composites processed by cyclic extrusion and compression

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Journal of Magnesium and Alloys 2023年第5期11卷 1608-1617页

作者： Mahmoud Ebrahimi Li Zhang Qudong Wang Hao Zhou Wenzhen Li National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240PR China School of Mechanical Engineering North University of ChinaTaiyuan 030051PR China Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094PR China School of Materials Science and Engineering Tsinghua UniversityBeijing 10084PR China

This work dealt with the damping performance and its underlying mechanism in SiC nanoparticles reinforced AZ91D composite(SiC_(np)/AZ91D)processed by cyclic extrusion and compression(CEC).It was found that the CEC process significantly affects the damping performance of the composite due to alterations in the density of dislocations and grain boundaries in the matrix *** there would be dynamic precipitation of the Mg17Al12 phase during processing which increases the phase interface and limits the mobility of dislocations and grain *** results also showed that the damping capacity of 1%SiC_(np)/AZ91D composite continuously decreases with adding CEC pass number and it consistently increases with rising the applied *** the first derivative of the tanδ-T curve,the dominant damping mechanism based on test temperature can be divided into three *** three regions are as follows(i)dislocation vibration of the weak pinning points(≤T_(cr)),(ii)dislocation vibration of the strong pinning points(T_(cr)∼T_(V)),and(iii)grain boundary/interface sliding(≥T_(V))

关键词： Metal matrix composite SiC nanoparticles Severe plastic deformation Temperature-dependent damping curves Damping mechanism

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Waste Mg alloys hydrogen production from seawater:An integrative overview of medium optimization,hydrogen-producing materials,underlying mechanisms,innovative technologies,and device development

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Journal of Magnesium and Alloys 2024年第9期12卷 3491-3515页

作者： Danting Li Xiaojiang Hou Duode Zhao Chenlu Wang Xinlei Xie Xiaohui Ye Guang Yang Ping Hu Guangsheng Xu School of material Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic materialShaanxi University of Science and TechnologyXi’an710021PR China College of Mechanical&Electrical Engineering Shaanxi University of Science and TechnologyXi’an 710021PR China Research Center of Intelligent microgrid and PEM Hydrogen Production and Storage Equipment Shaanxi Polytechnic InstituteXianyang712000PR China Research Center of High-performance aerospace materials and devices Shaanxi Polytechnic InstituteXianyang712000PR China

In response to global carbon neutrality targets,there is an urgent need for large-scale,clean hydrogen production technologies to supplant fossil fuels and underpin the establishment of a‘hydrogen economy’.The prospect of large-scale on-site green hydrolysis of Mg-based materials for hydrogen production has attracted wide *** at the problems of easy formation of inert oxide layer on its surface and the production of Mg(OH)_(2) to hinder the hydrolysis process,it is urgent to explore efficient,low-cost and green modification *** this work,the green modification strategy for hydrolyzing hydrogen production of Mg-based materials was summarized,and the fast initial kinetics and high hydrogen production rate could be achieved by adjusting hydrolysis medium conditions and modifying Mg-based *** significance of hydrolytic hydrogen production technology and device development for the realization of Mg-based hydrolytic hydrogen production was ***,this work looks forward to the future direction of hydrogen production modification by hydrolysis of Mg-based alloy,and gradually optimizes the hydrolysis performance of industrial multi-component waste Mg alloy under the premise of green hydrogen production,and proposes the goal of efficient modification of waste Mg alloy,high-quality utilization of seawater,and low-cost and controllable hydrogen production process.

关键词： Hydrogen energy Mg-based materials Hydrolysis Modification strategies Green technology

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Oscillatory Hall effect from magnetoelectronic coupling in flexoelectronic silicon

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Physical Review B 2024年第8期109卷 L081113-L081113页

作者： Paul C. Lou Ravindra G. Bhardwaj Anand Katailiha W. P. Beyermann Sandeep Kumar Department of Mechanical Engineering University of California Riverside California 92521 USA Department of Physics and Astronomy University of California Riverside California 92521 USA Materials Science and Engineering Program University of California Riverside California 92521 USA

Magnetoelectronic coupling can be defined as cross-domain coupling between electronic and magnetic properties, where modulation in magnetic properties changes the electronic properties. In this Letter, explicit experimental evidence of magnetoelectronic coupling is presented, which is uncovered from the oscillatory Hall effect response in Hall measurement. The strain gradient in a MgO (1.8 nm)/p-Si (∼400 nm) freestanding sample leads to transfer of electrons (∼5×1018cm−3) from valence to conduction band due to flexoelectronic charge separation in the p-Si layer. The resulting flexoelectronic polarization gives rise to the temporal magnetic moment from dynamical multiferroicity. The external magnetic field changes the net temporal magnetic moment, which causes modulations in charge carrier concentration and oscillatory Hall effect. The period of oscillatory Hall response is 1.12 T, which is attributed to the magnitude of the temporal magnetic moment. The discovery of the oscillatory Hall effect adds another member to the family of Hall effects.

关键词： Hall effect Doped semiconductors Electronically polarized systems Flexoelectrics Multiferroics Hall bar

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