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75th World Foundry Congress, WFC 2024

作者： Fang, Qingyuan Jiao, Zixiang Wang, Donghong Zhu, Guoliang Huang, Zhen Sun, Baode Shanghai Key Laboratory of Advanced High Temperature Materials and Precision Forming State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai China School of Materials Science and Engineering Shanghai University of Engineering and Technology Shanghai China Xi’an Aerospace Engine Company Limited Xi’an China

The thermal properties, rheological properties and melt compressible PVT characteristics of KC-2656L wax were investigated. Numerical simulation of the wax pattern process of rotary body structure was carried out based on Moldflow software. The calculation results show that the melt confluence exhibited by the wax pattern filling process matches with the location of fusion marks appearing in the actual injected wax pattern with the same process parameters, which verifies the accuracy of the numerical simulation results. After increasing the wax injection rate, reducing the wax pattern filling time, lowering the temperature difference between the flow front of the wax mold and the freezing layer factor at the end of filling, the wax melt flow resistance was effectively reduced. Correspondingly, the surface flow state and melt marks of the wax pattern were minimized, and the surface quality was improved. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Investment casting

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Flexible and conductive polyvinyl alcohol/Ti3C2Txcomposite film with excellent electromagnetic interference shielding performance 3

Flexible and conductive polyvinyl alcohol/Ti3C2Txcomposite f...

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3rd International Conference on Computer technology, Information Engineering, and Electron Materials, CTIEEM 2023

作者： Hu, Shujun Li, Shibo Beijing National Innovation Institute of Lightweight Ltd. Beijing101400 China State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science and Technology Group Beijing101400 China Centre of Materials Science and Engineering School of Mechanical and Electronic Control Engineering Beijing Jiaotong University Beijing100044 China

ISBN: (纸本)9781510672925

Lightweight composites with flexibility and ideal electromagnetic interference (EMI) shielding performance are required for protecting electronic devices against electromagnetic wave pollution. Herein, binary flexible and conductive polyvinyl alcohol (PVA)/Ti3C2Tx composite film with a "brick-and-mortar"structure was prepared using a vacuum filtration self-assembly strategy. By the combination of PVA and Ti3C2Tx, the PVA/Ti3C2Tx composite films have been successfully obtained, leading to high electrical conductivity (≥12.3 S/cm) and superior EMI shielding efficiency (≥27 dB, 8.2-12.4 GHz). The preparation of PVA/Ti3C2Tx film offers a promising approach for designing and fabricating flexible high-performance MXene-based EMI shielding materials, which may be applied in various applications including flexible wearable electronic devices and portable equipment. © 2024 SPIE.

关键词： Electromagnetic pulse

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Evaluation decision on green degree combination of typical welding processes for large-diameter thick plates 4

Evaluation decision on green degree combination of typical w...

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2024 4th International Conference on Artificial Intelligence and Industrial technology Applications, AIITA 2024

作者： Di, Fei Zhang, Kexu Wu, Jinjun Li, Jingying Wang, Ying Qu, Haoyuan China Productivity Center for Machinery Co. Ltd. Beijing100044 China State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science and Technology Beijing100083 China China Academy Machinery Science and Technology Group Beijing100044 China Machinery Technology Development Co. Ltd. Beijing100044 China

Aiming at the environmental impact of large-diameter thick plate manufacturing scenarios in the welding process, a comprehensive evaluation method combining AHP and TOPSIS is proposed to analyze and make decisions on the green welding process suitable for large-diameter thick plates. The optimal green welding process evaluation and decision-making index system for large-diameter thick plates is constructed. The system can be flexibly applied to different large-diameter plate welding scenarios by focusing on different optimization objectives, providing welders with a more suitable green welding process. The constructed model is applied to the seashore factory welding scenarios and general welding scenarios for comparative decision-making, and the effectiveness and feasibility of the proposed comprehensive decision-making evaluation method are verified by the actual data calculation results. © Published under licence by IOP Publishing Ltd.

关键词： Environmental impact

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Preparation and regulation of electromagnetic parameters of Ti3C2Tx@Ni composite powders 2

Preparation and regulation of electromagnetic parameters of ...

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2024 2nd International Conference on Materials Science and Intelligent Manufacturing, MSIM 2024

作者： Hu, Shujun Li, Shibo Pan, Peng Ge, Feng Yang, Ming Yu, Jinxi Wang, Jinnan Beijing National Innovation Institute of Lightweight Ltd. Beijing101400 China State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science and Technology Group Beijing101400 China Centre of Materials Science and Engineering School of Mechanical and Electronic Control Engineering Beijing Jiaotong University Beijing100044 China

Novel electromagnetic (EM) materials with adjustable EM properties are anticipated to fulfill the requirements of electronic communication, national defense, and aerospace fields. In this study, functional Ti3C2Tx@Ni composite powders with adjustable Ni content were successfully prepared using a facile electroless plating strategy. The EM parameters can be regulated by controlling the Ni content in Ti3C2Tx@Ni composite powders. As the Ni content increases, the values of real and imaginary parts of the complex permittivity of the Ti3C2Tx@yNi/wax (y = 10 ∼ 80) in the 2-18 GHz show a trend of initially decreasing and then increasing. The real and imaginary parts of the complex permeability of Ti3C2Tx@yNi/wax range from 0.95 to 1.03 and -0.10 to 0.07, respectively. After introducing magnetic Ni, Ti3C2Tx exhibits dielectric and magnetic losses on EM waves, with dielectric losses having a greater dissipation on the EM waves. © Published under licence by IOP Publishing Ltd.

关键词： Dielectric losses

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Microstructure evolution and mechanical properties of a novelγ’phase-strengthened Ir-W-Al-Th superalloy

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Rare Metals 2021年第12期40卷 3588-3597页

作者： Jie-Ren Yang Xiao Fang Yi Liu Zi-Tong Gao Ming Wen Rui Hu State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment Northwestern Polytechnical UniversityXi'an 710072China State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals Kunming Institute of Precious MetalsKunming 650106China

The present work introduces a novelγ’phasestrengthened Ir-W-Al-Th superalloy for ultrahigh-temperature ***,the as-cast microstructure and phase transformation of Ir-13 W-6 Al-0.15 Th(at%)alloy during solid solution and aging were *** transformation was observed during heat *** primaryγ’phase disappeared via the redissolution ofγ’→γat 1800℃.The recrystallization took place at 1450℃and very fine equiaxedγ’/γgrains formed after240 *** cold-rolled microstructure indicated that the room-temperature c phase was brittle and cracks mainly emerged along grain ***-13 W-6 Al-0.15 Th alloy exhibited a higher nanohardness than other Ir-based superalloys and pure Ir,which can be attributed to the solid solution and precipitation(γ’)*** addition,the as-cast Ir-13 W-6 Al-0.15 Th alloy shows a medium room-temperature compressive yield strength and good ductility.

关键词： Ir-based alloy Two-phase microstructure Strengthening Aging Mechanical properties

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Effect of Strontium Modification on Microstructure and Mechanical Property Al12SiCuMgNi Alloy in Squeeze Casting 7

Effect of Strontium Modification on Microstructure and Mecha...

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2024 7th International Conference on Mechanical, Electrical and Material Application, MEMA 2024

作者： Ji, Kaiwen Li, Longfei Liang, Junning Li, Chunming Zhao, Xuesheng Han, Qinghua Chen, Lin Zuo, Lingli Zhang, Yang China Academy of Machinery Science and Technology Beijing100044 China Beijing National Innovation Institute of Lightweight Ltd. Beijing100083 China State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science & Technology Group Beijing100083 China Hebei Fengwei Machinery Co. Ltd. Hebei Xingtai154500 China

The Al-Si series alloys, which have excellent fluidity and castability, are the most common aluminum material in the casting industry. However, the coarse eutectic Si phase with laminar morphology leads to the stress concentration of material and has a detrimental effect on the mechanical properties of aluminum alloy components. In this study, the Strontium (Sr) modifier was added to Al12SiCuMgNi alloy and the effect of Sr on microstructure and performance of Al12SiCuMgNi in squeeze casting was investigated. The experimental results show that the eutectic Si phase was well modified to fibrous morphology. Although the yield strength (YS) was leveled, the ultimate tensile strength (UTS) and elongation (EL) of the alloy were obviously enhanced after Sr addition. When the 0.012wt.% Sr was added to Al12SiCuMgNi alloy. The YS, UTS, and EL of alloys were up to 311 MPa, 401 MPa, and 3.4%, respectively. Moreover, the microstructure and performance of Al12SiCuMgNi alloy in the hot forging process were also compared to Al12SiCuMgNi alloy with and without Sr addition in squeeze casting. It is concluded that the Al12SiCuMgNi alloy in hot forging shows higher ductility (4.7%) and lower strength than Al12SiCuMgNi alloy in squeeze casting. © Published under licence by IOP Publishing Ltd.

关键词： Tensile strength

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Image Segmentation Algorithm on Sand Image Based on Improved MRF 37

Image Segmentation Algorithm on Sand Image Based on Improved...

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37th Youth Academic Annual Conference of Chinese Association of Automation, YAC 2022

作者： Wen, Xiaobang Rong, Wenjuan Cao, Xueting Wang, Mingzhao Wang, Chao State Key Laboratory of Advanced Forming Technology & Equipment China Academy of Machinery Science and Technology Group Beijing China Yunnan Machinery Research & Design Institute China Academy of Machinery Science and Technology Group Beijing China

ISBN: (纸本)9781665465366

The dimensional accuracy inspection is an important part of the sand print forming process, which is currently dominated by visual inspection or manual measurement with low efficiency and poor stability. In order to improve the visual inspection accuracy of sand mold forming in the process of sand mold 3D printing, this thesis proposes an improved Markov random field sand image segmentation algorithm. Be directed against the problems such as tooth-shaped edges after sand image segmentation, this thesis combines ICM theory with Markov random field algorithm, adds the potential function against tooth-shaped edges, fuses the energy fields of three likelihood functions to calculate the label field probability, and segments the sand-shaped image according to the energy minimum criterion. The experimental results show that the algorithm in this thesis can reduce the probability of tooth-shaped edge features, and the edge IOU is improved by 17.05 percent when compared with the threshold segmentation. In addition, the algorithm in this thesis is able to realize the accurate segmentation of sand image and improve the visual inspection accuracy, which provides a basis for online detection of sand mold accuracy. © 2022 IEEE.

关键词： Image segmentation

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Effect of Intensification Pressure on Eutectic Si Segregation of Al-12Si-1Cu Alloy in Squeeze Casting 3

Effect of Intensification Pressure on Eutectic Si Segregatio...

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2023 3rd International Conference on Industrial Manufacturing and Structural Materials, IMSM 2023

作者： Zhang, Rumeng Li, Longfei Chen, Yunbo Feng, Jian Li, Chunming Zhao, Xuesheng Chen, Lin Zuo, Lingli Zhang, Yang State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science & Technology Group Beijing100083 China Beijing National Innovation Institute of Lightweight Ltd. Beijing100083 China GRIMAT Engineering Institute Co. Ltd. Beijing101407 China

Squeeze casting is an advanced technology to produce aluminum alloy components with excellent mechanical property. Due to good fluidity and castability, the Al-Si alloy is the most common aluminum material in squeeze casting. However, the segregation in solid α-Al phase and liquid eutectic Si phase happens during solidification, which leads to microstructural inhomogeneous in the final microstructure. In this study, the eutectic Si segregation of Al-12Si-1Cu alloy under different intensification pressure in squeeze casting was investigated by Optical Microscopy (OM). The results show that increasing intensification pressure promotes the eutectic Si segregation at center zone, while the eutectic Si phase at skin zone is not much influenced. Increasing the intensification pressure from 65 MPa to 140 MPa, the segregation degree of eutectic Si at center zone increases from 0.05 to 0.29, while the segregation degree at skin zone levels at 0.2. Under high intensification pressure, the feeding effect of liquid phase at center zone is prominent, which results to high tendency of eutectic Si segregation in the final microstructure. © 2023 Institute of Physics Publishing. All rights reserved.

关键词： Silicon alloys

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Numerical simulation and experimental study of laminated incremental forming process 9

Numerical simulation and experimental study of laminated inc...

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2024 9th International Conference on Mechanical Structures and Smart Materials, ICMSSM 2024

作者： Xinhai, Zhao Xuemei, Liu Zhiyuan, Si Chao, Zheng Yongchao, Tan State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Shandong Jinan250061 China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Shandong Jinan250061 China Mechanical Materials Mechatronic and Biomedical Engineering University of Wollongong Wollongong2522 Australia Engineer Training Center Shandong University Jinan2500002 China

In order to improve the surface quality of incremental forming parts, this paper is studied. Through numerical simulation, the influence rules of different overlapping materials and overlapping thickness on the forming quality of target parts are obtained, and the optimal forming process parameters are given. Compared with the experimental results, the better forming results were obtained. © Published under licence by IOP Publishing Ltd.

关键词： Digital elevation model

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Process modeling gas atomization of close-coupled ring-hole nozzle for 316L stainless steel powder production

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Chinese Physics B 2021年第5期30卷 617-629页

作者： Peng Wang Jing Li Hen-San Liu Xin Wang Bo-Rui Du Ping Gan Shi-Yuan Shen Bin Fan Xue-Yuan Ge Miao-Hui Wang State Key Laboratory for Advanced Forming Technology and Equipment China Academy of Machinery and TechnologyBeijing 100083China Beijing National Innovation Institute of Lightweight Ltd. Beijing 100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China

The paper aims at modeling and simulating the atomization process of the close-coupled ring-hole nozzle in vacuum induction gas atomization(VIGA)for metallic powder *** of all,the primary atomization of the ring-hole nozzle is simulated by the volume of fluid(VOF)coupled large eddy simulation(LES)*** simulate the secondary atomization process,we use the method of selecting the droplet sub-model and the VOF *** results show that the ring-hole nozzle forms a gas recirculation zone at the bottom of the delivery tube,which is the main reason for the formation of an annular liquid film during the primary *** addition,the primary atomization process of the ring-hole nozzle consists of three stages:the formation of the serrated liquid film tip,the appearance and shedding of the ligaments,and the fragmentation of *** the same time,the primary atomization mainly forms spherical droplets and long droplets,but only the long droplets can be reserved and proceed to the secondary ***,increasing the number of ring holes from 18 to 30,the mass median diameter(MMD,d_(50))of the primary atomized droplets decreases first and then increases,which is mainly due to the change of the thickness of the melt ***,the secondary atomization of the ring-hole nozzles is mainly in bag breakup mode and multimode breakup model,and bag breakup will result in the formation of hollow powder,which can be avoided by increasing the gas velocity.

关键词： metallic powder hollow powder gas atomization ring-hole nozzle

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