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12th International Conference on advanced Materials and Engineering Materials, ICAMEM 2023

作者： Zhao, Xinhai Wang, Xinghui Sun, Xingchen Zheng, Chao Zhao, Liangang State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Shandong Jinan250061 China Shandong University Shandong Jinan250061 China Mechanical Materials Mechatronic and Biomedical Engineering University of Wollongong Wollongong2522 Australia China Aviation Lithium Battery Co. Ltd. Luoyang471000 China Unit 32128 of the Chinese People’s Liberation Army Jinan250061 China

ISBN: (纸本)9789819735297

In this study, we present a new three-stage forming and two-stage heating forming process to improve the forming quality of tubing end upsetting. The forming process of the new process is studied by numerical simulation, and the best forming process parameters are obtained. The experimental device is designed, and the experimental results verify the accuracy of the simulation results. Through this process, the quality of the transition zone can be guaranteed while the concave defects of the inner wall can be eliminated, which has certain guiding significance for the actual production. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Induction heating

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Activation of dislocations in Mg with solute Y

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Journal of Magnesium and Alloys 2024年第3期12卷 1045-1053页

作者： Alireza Maldar Leyun Wang Boyu Liu Wenjun Liu Zhaohui Jin Bijin Zhou Xiaoqin Zeng National Engineering Research Center of Light Alloy Net Forming Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China Advanced Photon Source Argonne National LaboratoryIL 60439USA Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of Mechanical Engineering Suzhou University of Science and TechnologySuzhou 215009China

Mg-Y cast alloy shows excellent ductility(elongation to failure>15%)compared with pure Mg and commercial Mg cast *** monitoring the microstructure evolution during an in situ tensile test of a Mg-2.5 wt%Y alloy,we identify the activation of prismaticslip,which is rare in *** X-ray micro-beam Laue diffraction(μ-Laue)and transmission electron microscopy revealed the morphology of prismaticslip bands and individual*** functional theory and molecular dynamics calculations indicate that solute Y can significantly reduce the stacking fault energy(SFE)alongdirection on prismatic plane in Mg lattice and thus facilitate the nucleation ofdislocations during *** presence of freedislocations in the Mg lattice can also lead to nucleation of{10–12}twins even under unfavorable geometric conditions.

关键词： alloy microstructure ductility

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Dynamic Recrystallization Behaviors and Cracking Mechanism for the Hot Deformation of New-Generation High Nitrogen Bearing Steel

SSRN

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SSRN 2024年

作者： Qian, Dongsheng Sun, Mengli Wang, Feng Xie, Lechun Hua, Lin School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Hubei key Laboratory of Advanced Technology for Automotive Components Wuhan430070 China Hubei Engineering Research Center for Green Precision Material Forming Wuhan430070 China

The hot forming as the necessary process of bearings will genetically affect the final performance. However, the dynamic recrystallization (DRX) behaviors and the crack formation mechanism under hot deformation remain unclear. In this work, the hot deformation behaviors of the X30CrMoN15-1 from 900 ℃ to 1200 ℃ have been investigated. The microstructure observation indicates that the fully DRX occurs at the conditions of high temperature and high strain rate (1000 ℃-1200 ℃, 1 s-1-5s-1). There are two main mechanisms of crack formation. Under lower temperatures (900 ℃-1000 ℃), the significant stress concentration produced by M2(C, N) should be responsible for crack propagation along the DRXed grain boundaries. As the temperature increases to 1100 ℃, the cracks are likely to initiate between the interface of DRXed grain and deformed grains, which is mainly attributed to the uncoordinated deformation and huge pinning of dislocations by Lomer-Cottrell (L-C) locks. Based on detailed findings of microstructure and cracks, a new hot processing map has been established. It reveals that the optimal processing domains are located at 1000℃ - 1100 ℃ with strain rate of 0.3 s-1 -5 s-1 and 1020 ℃ - 1200 ℃ with strain rate of 1.5 s-1 -5 s-1. © 2024, The Authors. All rights reserved.

关键词： Strain rate

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Type synthesis of deployable mechanisms for ring truss antenna based on constraint-synthesis method

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Chinese Journal of Aeronautics 2020年第9期33卷 2445-2460页

作者： Bo HAN Yundou XU Jiantao YAO Dong ZHENG Luyao GUO 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 deployable antenna is the key equipment in realizing the communication and data transmission between the spacecraft and the *** order to enrich the configurations of deployable antennas,the type synthesis of deployable mechanisms for ring truss antenna is conducted in this ***,the principle of the constraint-synthesis method based on screw theory is briefly described,the structure of the ring truss deployable antenna and its folding principle are analyzed,and the ring truss mechanism is divided into upper edges,lower edges and ***,based on the constraint-synthesis method,the type synthesis of the basic unit edges is carried out,a series of basic unit mechanisms are obtained from combining the basic unit edge mechanisms,and five mechanism units with fewer joints and simple structures are ***,simulation models of the five ring truss deployable mechanisms are built in Solidworks and Matlab software,and the deploying process is verified by the movement ***,mechanism characteristics of the five mechanisms are analyzed and discussed,and a prototype is manufactured,verifying the analysis in this *** research provides a new way for the type synthesis of spatial deployable mechanisms,and the ring truss deployable mechanisms obtained in this study can be well applied in the field of aerospace.

关键词： Constraint-synthesis method Deployable mechanism Ring truss antenna Screw theory Type synthesis

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Design and experimental study of the remote control for a novel patient transfer apparatus 5

Design and experimental study of the remote control for a no...

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2020 5th International Seminar on Computer technology, Mechanical and Electrical Engineering, ISCME 2020

作者： Tian, Yu Wang, Hongbo Zhang, Yongshun Tian, Junjie Du, Jiazheng Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Qinhuangdao Hebei China Key Laboratory of Advanced Forging and Stamping Technology and Science of Ministry of Education Yanshan University Qinhuangdao Hebei China

This paper introduces the design of the remote control for a novel patient transfer apparatus. First, the overall design of the control system is put forward based on the working principle, and design requirements of the apparatus. Second, voltage regulator circuit of the remote control based on the MC34063 is designed to fit for the OLED displayer, parameters such as the filter capacitor have been determined. Next, wireless communication unit adopted CC1110 and the communication instruction code is introduced. Then, the interaction interface of the remote control is finished to facilitate the implementation of the adjustment functions. finally, a simulation and a real experiment has been completed, it indicates the correctness of the voltage regulator circuit and the effectiveness of the remote control respectively. © Published under licence by IOP Publishing Ltd.

关键词： Remote control

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Influence of Co on the microstructure and mechanical properties of M42 high-speed steel 2

Influence of Co on the microstructure and mechanical propert...

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2nd International Conference on advanced Materials and Chemical Engineering, AMCE 2022

作者： Wang, Shunduo Chen, Yunbo Pan, Peng Lin, Zhenghua Zuo, Lingli China Academy of Machinery Science and Technology Beijing100044 China Beijing National Innovation Institute of Lightweight Ltd. Beijing100083 China State Key Laboratory for Advanced Forming Technology and Equipment Beijing100083 China Fujian Hengerda New Materials Ltd. Putian351142 China

M42 high-speed steel (W2Mo9Cr4VCo8) is a kind of high cobalt super-hard high-speed steel (HSS), which is extensively used in various cutting tool materials, but because of the high price of cobalt, high cobalt HSS does not bring good economic benefits. In this thesis, the consequences of various cobalt contents (0.0%, 2.0%, 4.0%, 6.0%, 8.0%) on the organization and mechanical properties of M42 HSS have been studied. The microstructure of HSS was analyzed by OM, SEM, and EDS, and the Rockwell hardness test, impact toughness test, and flexural strength test were conducted. The results show that cobalt helps to increase the nucleation rate of eutectic carbide precipitation and hinder its growth during tempering of HSS and refine the size of eutectic carbide, and the tempering hardness can be maintained above 68 HRC when the cobalt content is 4%-8%;however, cobalt also significantly reduces the impact toughness of HSS, and each 2% increase in cobalt impact toughness decreases about 4 J·cm-2. From the point of view of cobalt savings, cobalt content of 4%, high-speed steel tempering hardness, impact toughness, and other mechanical properties can be at a higher level. © Published under licence by IOP Publishing Ltd.

关键词： Eutectics

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Study on the Microstructure and Properties of Eh40/2205 Interface with Fe, Co, Ni Composite Interlayer

SSRN

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SSRN 2024年

作者： Zhang, Biao Feng, Kangkang Shen, Xiaolong Yi, Yali Jin, Herong School of Mechanical Engineering Yanshan University Qinhuangdao066004 China Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Qinhuangdao066004 China Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of National Education Yanshan University Qinhuangdao066004 China

The impact of dual and triple-layer composite interlayer (CI), constructed from Fe, Co, and Ni foils, on the microstructure and mechanical properties of the interface of EH40/2205 clad plates was investigated. The findings indicated that all groups of CI had achieved metallurgical bonding between EH40 and 2205. Specifically, the Ni layer, which had been positioned close to the composite layer 2205, had hindered the diffusion of Ni and Cr, enhancing the plasticity of the clad plate. The Fe layer, situated between Ni and Co, had increased the hardness of the CI by 180~190HV through solid solution strengthening. The Co layer, located near the base layer EH40, had been approximately 70HV harder than the Ni layer, increasing the ultimate tensile strength (UTS) and ultimate shear strength (USS) of the clad plate by about 20%. Among the schemes, EH40/Co/Fe/Ni/2205 had been the preferred option, with a UTS of 549MPa and a USS of 704MPa. © 2024, The Authors. All rights reserved.

关键词： Microstructure

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Sole Spherical L12 Nanoprecipitates Strengthened Ni35co27.5cr27.5al5ti5 High-Entropy Alloy Fabricated by Simplified Short-Term Heat Treatment Processing

SSRN

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SSRN 2024年

作者： Huang, Liran Fu, Zhiqiang Chu, Chenliang Chen, Weiping Wang, Hao Zhu, Dezhi Guangdong Key Laboratory for Advanced Metallic Materials Processing South China University of Technology Guangzhou510641 China National Engineering Research Center of Near-net-shape Forming for Metallic Materials South China University of Technology Guangzhou510641 China

Introducing L12 precipitates into face-centered-cubic (FCC) structured equiatomic CoCrNi medium-entropy alloy (MEA) is a promising strategy for improving its disappointing yield strength, which typically falls below 450 MPa at room temperature. However, conventional methods for obtaining L12 precipitates often require intricate thermomechanical processing (TMP), yielding undesirable cellular formations of these precipitates along grain boundaries (GBs), which detrimentally impact mechanical properties. In this study, we propose a novel approach to address these challenges by designing and fabricating a non-equiatomic Ni35Co27.5Cr27.5Al5Ti5 high-entropy alloy (HEA) consisting of sole spherical L12 nanoprecipitates. This achievement was attained through a simplified short-term heat treatment process involving casting, homogenization, and aging. Notably, both the homogenized and aged HEA samples exhibit equiaxed grains, with the latter showcasing uniformly distributed spherical L12 nanoprecipitates in the FCC matrix. The average size and volume fraction of these nanoprecipitates in the aged HEA are ~10.9 nm and 41.9 vol.%, respectively. Mechanical testing reveals remarkable improvements in the aged HEA, with a yield strength of ~916 MPa, an ultimate tensile strength of ~1220 MPa, and a total elongation of ~21.5%. The observed enhancement is primarily attributed to precipitation strengthening mechanism. Digital image correlation (DIC) analysis of tensile deformation demonstrates uniform strain distribution in both the homogenized and aged HEA samples. Furthermore, electron channeling contrast imaging (ECCI) and transmission electron microscopy (TEM) examinations unveil a complex interplay of deformation mechanisms, including multiple planar slip, dislocation shearing coherent L12 precipitates, stacking fault (SF) networks, and Lomer-Cottrell (L-C) locks. These mechanisms collectively impede dislocation motion, thereby contributing to the excellent strain-hardening abili

关键词： Heat treatment

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Review on Additive Manufacturing of Single-Crystal Nickel-based Superalloys

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2022年第1期1卷 96-115页

作者： Yang Li Xiaoyu Liang Yefeng Yu Dongfang Wang 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 conventional fabrication process for single-crystal nickel-based superalloy materials is directional solidifica-tion,which is classified as *** the rapid development of additive manufacturing(AM)technologies,a novel process for fabricating single-crystal superalloys has become *** article reviews recent research on the AM of single-crystal nickel-based *** AM technologies,particularly directed energy deposition,are mainly used to repair single-crystal *** beam powder bed fusion is an innovative method for the direct fabrication of single-crystal ***,the mechanisms of single-crystal formation during AM are analyzed to elucidate the potential of this process ***,this article discusses the challenges faced by AM for single-crystal fabrication,and provides perspectives on the trends of future developments.

关键词： Nickel-based superalloy Single crystal Laser additive manufacturing Electron beam powder bed fusion

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Densification,microstructural features and tensile properties of selective laser melted AlMgSiScZr alloy from single track to block specimen

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Journal of Central South University 2021年第4期28卷 1129-1143页

作者： BI Jiang CHEN Yan-bin CHEN Xi STAROSTENKOV M D DONG Guo-jiang Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of Education Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China General Physics Department Polzunov Altai State Technical UniversityBarnaul 656038Russia

The selective laser melting(SLM)processed aluminum alloys have already aroused researchers’attention in aerospace,rail transport and petrochemical engineering due to the comprehensive advantages of low density,good corrosion resistance and high mechanical *** this paper,an Al-14.1Mg-0.47Si-0.31Sc-0.17Zr alloy was fabricated via *** characteristics of single track at different process parameters,and the influence of hatch spacing on densification,microstructural features and tensile properties of block specimens were systematically *** hatch spacing has an influence on the overlap ratio of single track,and further affects the internal forming quality of printed *** a laser power of 160 W and scanning speed of 400 mm/s,the densification of block specimen increased first and then decreased with the increase of hatch *** nearly full dense specimen(98.7%)with a tensile strength of 452 MPa was fabricated at a hatch spacing of 80μ*** characteristics of dimple and cleavage on the tensile fracture of the AlMgSiScZr alloy showed the mixed fracture of ductility and brittleness.

关键词： selective laser melting aluminum alloy hatch spacing microstructural feature tensile properties

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