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75th World Foundry Congress, WFC 2024

作者： Ma, Dong Xu, Chunjie Sui, Shang School of Materials Science and Engineering Xi’an University of Technology Shaanxi Xi’an China Xi’an Shechtman Nobel Prize New Materials Institute Shaanxi Xi’an China Xi’an Key Laboratory of Advanced Magnesium Alloy Additive Manufacturing and Precision Forming Shaanxi Xi’an China

Customized heat treatment is essential for enhancing the mechanical properties of additively manufactured metallic materials, especially for the alloys with complex phase constituents and heterogenous microstructure. However, the interrelated evolutions of different microstructure features make it difficult to establish optimal heat treatment processes. Herein, we proposed a method for customized heat treatment process exploration and establishment to overcome this challenge for such kind of alloys, and a wire arc additively manufactured (WAAM) Mg-Gd-Y-Zn-Zr alloy with layered heterostructure was used for feasibility verification. Through this method, an optimal microstructure (fine grain, controllable amount of LPSO structure and nano-scale β' precipitates) and the corresponding customized heat treatment process (520 °C/30 min + 200 °C/48 h) were obtained to achieve a combination of a high strength of 364 MPa and a considerable elongation of 6.2 %, which surpassed those of other state-of-the-art WAAM-processed Mg alloys. Furthermore, we evidenced that the favorable effect of the undeformed LPSO structure on the mechanical properties was emphasized only when the nano-scale β' precipitates were present. It is believed that the findings promote the application of magnesium alloy workpieces and help to establish customized heat treatment process for additively manufactured materials. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Magnesium alloys

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Experimental Study on Uniaxial Strain Cyclic Behavior of GS-20Mn5 13th

Experimental Study on Uniaxial Strain Cyclic Behavior of GS-...

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13th International Conference on the technology of Plasticity, ICTP 2021

作者： Zou, Zongyuan Han, Shuting Wang, Hongzhong Li, Qun Guo, Baofeng Zhao, Shiyan Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University Qinhuangdao China

ISBN: (纸本)9783030753801

Due to the common discontinuity of the structure and non-uniform load, local high stress phenomenon tends to appear in the mechanical structure under repeated loading, and even local small plastic deformation may occur. In this case, the cyclic elastic–plastic mechanical properties of the structural steel are the key elements for the reasonable and accurate assessment of structural safety. In order to study the cyclic mechanical properties of GS-20Mn5, which is a commonly used steel in load-bearing mechanical equipment, corresponding strain cyclic loading tests were performed. The cyclic elastoplastic deformation characteristics under strain-controlled cyclic loading with different strain ratios (R = −1,0.5) are studied, and the cyclic hardening/softening and mean stress relaxation features are revealed. The results show that the cyclic hardening/softening features are affected by the strain amplitude and cycles. This test material tends to show cyclic hardening at higher strain amplitudes. The cyclic stress–strain curve is obtained by the incremental step test, and the corresponding yield strength is about 4.8% larger than that under uniaxial tension. When R = 0.5, the test material exhibits obvious mean stress relaxation. When the strain amplitude is 0.16%, 0.30%, and 0.40%, the mean stress decreases and then stabilizes at about 25 MPa, −3 MPa, and −6 MPa, respectively. For the mechanical equipment made of GS-20Mn5 with local small plastic deformation under cyclic loading, the obtained cyclic mechanical performance of GS-20Mn5 can provide a reference for the analysis and evaluation of the structural safety. © 2021, The Minerals, Metals & Materials Society.

关键词： Plastic deformation

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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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Development of Predictive Maintenance System for Nuclear Power Turbine Unit 2

Development of Predictive Maintenance System for Nuclear Pow...

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2nd International Conference on Artificial Intelligence and Computer Information technology, AICIT 2023

作者： Tang, Junhao You, Dongdong Li, Fenglei Cheng, Yong National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials Guangdong Key Laboratory for Advanced Metallic Materials Processing Guangdong China Beijing Qingtai Data Technology Co. Ltd Beijing China

ISBN: (纸本)9798350302950

The safe operation of nuclear power plants is the most concerned issue in the nuclear power industry. Intelligent early warning and predictive maintenance of mechanical equipment such as steam turbines can effectively prevent nuclear power plant safety accidents and reduce maintenance costs. This paper will introduce the architecture and process of predictive maintenance system and apply it to nuclear power steam turbine units. The developed predictive maintenance system of nuclear power steam turbine units is equipped with LSTM-Bayes signal anomaly recognition method, benchmarking other manufacturers' systems, and improving many indicators. For example, new early warning parameters such as abnormal probability, remaining useful life and characteristic signals are added to help maintenance, making it more intelligent. It has been verified that the input of the system reduces the failure rate of mechanical equipment, saves maintenance costs, can effectively ensure safe operation, improve productivity and reduce costs. © 2023 IEEE.

关键词： Nuclear energy

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Surface Quality Control of Wax Pattern for Ring Plate Structure 75

Surface Quality Control of Wax Pattern for Ring Plate Struct...

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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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Optimization of the in vitro biodegradability,cytocompatibility,and wear resistance of the AZ31B alloy by micro-arc oxidation coatings doped with zinc phosphate

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Journal of Materials Science & technology 2024年第12期179卷 224-239页

作者： Chao Yang Suihan Cui Ricky KYFu Liyuan Sheng Min Wen Daokui Xu Ying Zhao Yufeng Zheng Paul KChu Zhongzhen Wu School of Advanced Materials Peking University Shenzhen Graduate SchoolShenzhen 518055China Department of Physics Department of Materials Science&Engineeringand Department of Biomedical EngineeringCity University of Hong KongTat Chee AvenueKowloonHong Kong 999077China Shenzhen Institute Peking UniversityShenzhen 518057China PKU-HKUST Shenzhen–Hong Kong Institution Shenzhen 518057China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518055China National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite Shanghai Jiao Tong UniversityShanghai 200240China

As implanted bone fixation materials,magnesium(Mg)alloys have significant advantages because the density and elastic modulus are closest to those of the human bone and they can bio-degrade in the physiological ***,Mg alloys degrade too rapidly and uncontrollably thus hampering clinical *** this study,a highly corrosion-resistant zinc-phosphate-doped micro-arc oxidation(MAO)coating is prepared on the AZ31B alloy,and the degradation process is assessed in *** increasing zinc phosphate concentrations,both the corrosion potentials and charge transfer resistance of the AZ31B alloy coated with MAO coatings increase gradually,while the corrosion current densities di-minish *** tests in the simulated body fluid(SBF)reveal that the increased zinc phos-phate concentration in MAO coating decreases the degradation rate,consequently reducing the release rates of Mg^(2+)and OH-in the physiological micro-environment,which obtains the lowest weight loss of only 5.22%after immersion for 56 *** regulation of degradation provides a weak alkaline environment that is suitable for long-term cell growth and subsequent promotion of bone proliferation,differentiation,mineralization,and *** addition,the zinc-phosphate-doped MAO coat-ings show an improved wear resistance as manifested by a wear rate of only 3.81 x 10^(-5) mm^(3) N^(-1) m^(-1).The results reveal a suitable strategy to improve the properties of biodegradable Mg alloys to balance tissue healing with mechanical degradation.

关键词： Mg alloys MAO coatings Degradation regulation Cytocompatibility Wear resistance

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Research on the Process-based Generation Method of Multi-ships Collision Avoidance Test Scenarios Database for Maritime Autonomous Surface Ships 33rd

Research on the Process-based Generation Method of Multi-shi...

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33rd International Ocean and Polar Engineering Conference, ISOPE 2023

作者： Wang, Xinyu Wang, Yihang Bian, Hui Ma, Jilin Zhao, Xuan Qinhuangdao Branch China Classification Society Hebei China School of Mechanical Engineering Yanshan University Hebei China Parallel Robot and Mechatronic System Laboratory Hebei Province Hebei China Key Laboratory of Advanced Forging & Stamping Technology and Science Hebei China Science & Technology Innovation and Test Center Beijing China

ISBN: (纸本)9781880653807

This paper proposes a process-based method for generating virtual test scenarios for near-shore maritime autonomous surface ships (MASS) collision avoidance tests. The method includes a scenario complexity index to provide different difficulty levels of virtual test scenarios for different test requirements, reducing the test volume while ensuring coverage and reliability requirements. The scenario database generated by this method reflects the frequency of real-world scenarios and meets the requirements of virtual test realism. This method can improve the efficiency and reliability of MASS testing, with potential future improvements in the complexity evaluation matrix and statistical analysis of vessel maneuvering ability. © 2023 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Ships

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Effect of contact forms on the wear of hard silicon surfaces by soft polymers

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Friction 2021年第5期9卷 918-928页

作者： Zhaoxiang ZHANG Xiaohong JIA Fei GUO Zhongde SHAN Yuming WANG State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Joint Research Center for Rubber and Plastic Seals Tsinghua UniversityBeijing 100084China State Key Laboratory of Advanced Forming Technology&Equipment China Academy of Machinery Science&TechnologyBeijing 100044China

The mechanism of hard surfaces worn by soft polymers is not clearly *** this paper,a new hypothesis has been proposed,it holds that the stress acting on the hard surface under certain working conditions is the main reason for wear of the hard surface by a soft *** hypothesis was investigated by changing the contact form between *** this,friction tests between six polymer spheres and smooth,rough,and inclined monocrystalline silicon surfaces were carried *** results show that for the same tribo-pair,the silicon surface will not be worn in some contact forms,but in other contact forms it will be *** believe the wear of hard surface by a soft polymer is the result of the combined stress state action on the hard surface.

关键词： polymers silicon surface wear combined stress

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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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Achieving the strength and ductility synergy in the AlN/ZK60 Mg matrix composite with the bimodal structure

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Journal of Magnesium and Alloys 2025年

作者： Xu, Sinuo Sun, Chaoyang Li, Hongxiang Liu, Boyu Feng, Yinghao Wang, Chunhui Liu, Jingchen School of Mechanical Engineering University of Science and Technology Beijing Beijing100083 China Beijing Key Laboratory of Lightweight Metal Forming Beijing100083 China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing100083 China

Overcoming the strength and ductility trade-off is conducive to expanding the application prospects of the Mg matrix composites. A new approach of using the master alloy containing particulate reinforcements to achieve the strength and ductility synergy in the Mg matrix composites was proposed, which can induce the grain size bimodal structure by regulating the dynamic recrystallization (DRX). Specifically, a novel AlN-Al master alloy was prepared via powder metallurgy to fabricate the AlN/ZK60 composite, and the effects of adding the AlN-Al master alloy on microstructure evolution related to the strength and ductility synergy in the composite were thoughtfully investigated, involving precipitation, grain size, and DRX behavior. The reaction between the Al in the master alloy and the Zr in the ZK60 Mg alloy suppressed the grain refinement, and the coarse grains were further formed after the solution treatment on the as-cast composite. Subsequently, deformation heterogeneity between the AlN and Mg matrix during the hot extrusion induced discontinuous dynamic recrystallization (DDRX) and promoted fine grain fraction. The combination formed the bimodal structure in the AlN/ZK60 composite, and coarse and fine grains acted as hard and soft zones, respectively, during the room temperature deformation. The hard zone was enhanced by the basal texture strengthening, and the ductility was improved due to the promotion of the basal 〈a〉 slipping in the soft zone, jointly leading to the strength and ductility synergy in the AlN/ZK60 composite for the ultimate tensile strength increased by ∼7.4 % while maintaining the same elongation compared with the ZK60 Mg alloy. © 2025

关键词： Grain refinement

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