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Modelling and analysis of metal flowing behaviors in constraining ring rolling of tapered ring with thin wall and three high ribs

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Chinese Journal of Aeronautics 2023年第6期36卷 476-492页

作者： Lin HUA Duanyang TIAN Xinghui HAN Wuhao ZHUANG Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory Xiangyang 441000China School of Automotive Engineering Wuhan University of TechnologyWuhan 430070China

Tapered ring with thin wall and three high ribs(TRTWTHR),showing complicated geometry(wall thickness is less than 4 mm and rib height exceeds 20 mm),is extensively utilized to fabricate the critical structural parts of aerospace equipment such as spacecraft cabin,rocket body and fuel tank because of light weight and high carrying *** to fabricate TRTWTHR with high performance is a critical problem that aerospace area needs to *** this work,constraining ring rolling(CRR)technique is first adopted to form *** metal streamlines(UMS)and uncoordinated growth of three ribs easily occur in CRR of TRTWTHR,which makes the forming quality of TRTWTHR difficult to be *** with this difficulty,an analytical model that can predict UMS and the height of three ribs in CRR of TRTWTHR is established so as to guide the process design of ***,the reliability of the established analytical model and the feasibility of CRR of TRTWTHR are confirmed by FE simulation and ***,using the established analytical model,the window of UMS occurring relevant to the tapered angle of TRTWTHR and the location of the rib of middle end is ***,three uncoordinated growth modes among three ribs are found when the width of three ribs is identical and UMS do not occur,and the mechanisms of three uncoordinated growth modes are revealed.

关键词： Analytical model Constraining ring rolling Growth of three ribs Metal streamlines Tapered ring with thin wall and three high ribs

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Residual stress optimization in laser melting deposited TC4 titanium alloy using in-situ electromagnetic field

Residual stress optimization in laser melting deposited TC4 ...

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Chinese Materials Conference 2024, CMC 2024

作者： Li, Weihao Fu, Tao Zhou, Jian Wang, Haoxing Wen, Yan Xie, Lenchun Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan430070 China

This study explores the optimization of residual stress in TC4 titanium alloy fabricated using laser melting deposition (LMD) through the application of in-situ electromagnetic fields. The electromagnetic field was found to significantly enhance the uniformity of residual stress both on the surface and along the depth direction of alloy. Specifically, a electromagnetic field strength of 35 mT induced the most uniform surface stress distribution, while 56 mT provided the most consistent stress profile along the depth. These results are attributed to the electromagnetic field-induced stirring within the molten pool, which promotes grain refinement and leads to a more uniform distribution of residual stresses. Microstructure analysis further reveals that the electromagnetic field refines the grain structure, promoting the formation of equiaxed grains instead of large columnar crystals typically observed in the absence of electromagnetic field. The findings highlight the potential of electromagnetic field-assisted LMD in optimizing the mechanical properties and stability of additively manufactured titanium alloy, offering valuable insights for improving the reliability and performance of advanced titanium alloys. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Titanium alloys

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Effect of the electromagnetic field on the microstructure of TC4 titanium alloy during laser melting deposition

Effect of the electromagnetic field on the microstructure of...

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Chinese Materials Conference 2024, CMC 2024

作者： Fu, Tao Xie, Lechun Li, Weihao Wen, Yan Wu, Yongjian Sun, Hongxin Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan430070 China

This paper characterized and analyzed the microstructure of TC4 (Ti6Al-4V) titanium alloy manufactured by laser melting deposition (LMD) under the electromagnetic field. The results showed that the initial LMD-TC4 specimen contains many coarse columnar crystals, and there were aM phases with high aspect ratios, which constitute a dense mesh basket structure and Widmannstatten structure. After electromagnetic treatment, the equiaxial trend of columnar crystals became more and more obvious, and the needle-like a phases are precipitated in the ß phase, the size of the a phases became significantly smaller, and the arrangement mode between grains also changed to the parallel and staggered arrangement. The Electron Backscatter Diffraction (EBSD) results showed that the grain orientation became uniform, the dislocation density decreased, and the average grain size of the sample after electromagnetic treatment was also reduced, indicating that electromagnetic treatment can play a role in grain refinement. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Titanium alloys

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Fusion method aiming at environmental perception of autonomous vehicle based on visual scheme

Fusion method aiming at environmental perception of autonomo...

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2024 International Conference on Optics, Electronics, and Communication Engineering, OECE 2024

作者： Tu, Gepeng Wu, Jing Liu, Bo Wang, Xinyu Wuhan University of Technology Hubei Key Laboratory of Advanced Technology for Automotive Components Hubei Wuhan430070 China

ISBN: (纸本)9781510685437

The task of environmental perception is an extremely important part of the automatic driving project, and mainstream schemes are divided into visual perception and radar perception. Visual algorithms have advantages in cost and object detection or image segmentation methods are usually used for perception. We adopt computer vision scheme to collect data and establish Transportation of Wuhan China (TOWC) datasets based on Chinese urban situation. After optimizing the selection of anchor boxes, the Yolov4 model is retrained as the object detector, which is combined with Simple Online and Real-time Tracking (SORT) algorithm and Perspective-n-Point (PnP) monocular algorithm to realize the integration of object detection, tracking. The detection and tracking methods have been evaluated against the Microsoft Common Objects in Context (MSCOCO) datasets and Multiple Object Tracking (MOT) challenge respectively. And the detection performance also has been evaluated again in our TOWC datasets. The evaluation has been conducted in challenging conditions, including occlusion, partial visibility, and under lighting variations with the mean average precision of 97.17% and the real-time speed of 30.2 FPS. The results show that our fusion detection algorithm is not inferior to other most advanced methods on the premise of excellent real-time performance. The developed model is a generic and accurate solution for traffic object detection and tracking, which can be applied to many other fields, such as automatic driving vehicle, traffic sign recognition, anomaly detection, motion analysis, or any other research areas where the traffic environmental perception is in the center of attention. © 2024 SPIE.

关键词： Traffic signs

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Quadruped Robot Motion Control Method Based on Adaptive Weight Coefficients MPC 7

Quadruped Robot Motion Control Method Based on Adaptive Weig...

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7th International Conference on advanced Algorithms and Control Engineering, ICAACE 2024

作者： Nan, Zhipeng Xu, Lin Han, Chengleng Zhao, Guorui Wuhan University Of Technology Hubei Key Laboratory Of Advanced Technology For Automotive Components Wuhan China

ISBN: (纸本)9798350361445

In real-world environments, quadruped robots often need to traverse unstructured terrains and may encounter various unexpected impacts. To enhance the motion balance performance of quadruped robots when facing unknown disturbances in such environments, we propose a fuzzy adaptive weight controller based on Model Predictive Control (MPC). By conducting an in-depth analysis of the impact of weight coefficients in the MPC's objective function on control effectiveness, we have designed an adaptive fuzzy algorithm. This algorithm dynamically adjusts the weight coefficients according to the current errors in the robot's roll and pitch angles, as well as their rates of change. Subsequently, the MPC controller calculates the optimal control torques using these adjusted weight coefficients. To validate the effectiveness of this strategy, we conducted simulations of lateral impacts and walking on unstructured terrains in Gazebo. The simulation results demonstrate that, under various test conditions, the proposed adaptive weight MPC controller significantly improves the robot's motion stability, showcasing its strong capability to handle unknown disturbances. © 2024 IEEE.

关键词： Model predictive control

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Effects of Electric and Magnetic Treatments on Microstructures of Solid Metals: A Review

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Chinese Journal of Mechanical Engineering 2023年第6期36卷 1-21页

作者： Yanli Song Wenlin Wu Yongqing Yu Lin Hua Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of TechnologyWuhan 430070China School of Automotive Engineering Wuhan University of TechnologyWuhan 430070China Hubei Research Center for New Energy&Intelligent Connected Vehicle Wuhan University of TechnologyWuhan 430070China

An external electric or magnetic field can transfer high-intensity energy directly to the electronic scale of materials,and change the spin,energy level arrangement and trajectory of *** changes produce tremendous and profound impacts on the microstructure and mechanical properties of metal materials,which may be impos-sible with traditional *** paper reviews the effects of electric or magnetic field on the microstruc-tures of solid metals including phase transformation,precipitation,recrystallization,dislocations and so *** on the existing research results,the mechanisms of these effects have been ***,some typical applications of electric and magnetic treatments on solid metals have been described and the challenges in this field have also been discussed.

关键词： Electric field Magnetic field Microstructures Mechanical properties Solid metals

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A model for converting thermal analysis to volume fraction of high carbon bearing steels during low-temperature tempering

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Journal of Materials Science & technology 2023年第5期136卷 212-222页

作者： Qinglong Liu Junyu Tian Wenting Wei The State Key Laboratory of Refractories and Metallurgy The Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of EducationWuhan University of Science and TechnologyWuhan 430081China School of Automotive Engineering Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Advanced Technology for Automotive Components(Wuhan University of Technology) Wuhan 430070China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan 430070China

Quantitative prediction of phase content is of great importance to control and optimize the heat treat-ment process of *** this work,a model for predicting the phase content of tempered high carbon steels was proposed by taking a martensitic 100Cr6 bearing steel as a model *** microstructural transformations during tempering were studied using thermal analysis,transmission electron microscopy(TEM),and X-ray diffraction(XRD).Kinetics analysis of thermal evolution by employing the isoconver-sional method,and assisted by TEM and XRD characterization,were performed to quantitatively estimate the volume fractions of different phases after tempering.A series of isothermal tempering experiments were designed to verify the *** predicted results were in good agreement with the experimental results of XRD and electrolytic extraction measurements.

关键词： Bearing steel Martensite tempering Retained austenite Thermal analysis Kinetics

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Investigation on Transport Phenomena and Molten Pool Dynamics during Laser Melting Deposition of Ti-6Al-4V 2

Investigation on Transport Phenomena and Molten Pool Dynamic...

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2nd International Conference on Smart Energy and New Power Systems, SENPS 2024

作者： Wu, Yongjian Zhou, Jian Wen, Yan Xie, Lechun Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan430070 China

The physical phenomena involved in laser melting deposition are extremely complex, including solid-liquid phase transition, gas-liquid interface coupling, the Marangoni effect, and others factors. A novel multiphase model is proposed to describe the evolution of gas-liquid-solid interface during the laser melting deposition process of Ti-6Al-4V. Based on the volume of fluid (VOF) method, a volume fraction gradient method is introduced to accurately track the motion of the free surfaces. The model can simulate alterations in temperature and flow fields during deposition, predict the geometric configurations of the melt pool and deposition layer, and shows minimal deviation from the experimental data, thereby providing a significant reference value. © Published under licence by IOP Publishing Ltd.

关键词： Gradient methods

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Evaluation of microstructure variation of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy manufactured by laser melting deposition after electroshocking treatment 9

Evaluation of microstructure variation of Ti-6.5Al-3.5Mo-1.5...

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9th International Conference on Energy Materials and Electrical Engineering, ICEMEE 2023

作者： Sun, Xuan Liu, Bingliang Wen, Yan Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9781510672765

Electroshocking treatment (EST) was a method to optimize the microstructure of titanium alloy. Under EST, the dense basket-weave structure in Ti-6.5Al-3.5Mo-1.5Zr-0.3Si (TC11) manufactured by laser melting deposition became sparse, and colony tissue nucleation grows near grain boundaries. The phase transformation induced by EST results in changes in the intensity and orientation of α and β textures in TC11, but α/β still obeyed the Burger orientation relationship, and the β phase content increased. At the same time, EST also promoted the dislocation movement near the grain boundary, and a mass of dislocation accumulation at the grain boundary increased the KAM value at the grain boundary. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Electroshocking treatment (EST) Laser melting deposition (LMD) Microstructure Texture Titanium alloy

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Performance and mechanism analysis of EMA-GMA modified PMMA/ASA alloy 8

Performance and mechanism analysis of EMA-GMA modified PMMA/...

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2024 8th International Conference on Energy technology and Materials Science, ICETMS 2024

作者： Gu, Zhaohui Wang, Hui Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China

This article examines the impact of the EMA-GMA combination on the mechanical characteristics, fluidity, and glass transition temperature of PMMA/ASA alloy and uses scanning electron microscopy to characterize the modified PMMA/ASA alloy. The findings indicate that the addition of 5% EMA-GMA to PMMA/ASA significantly enhances its fracture resistance without compromising its stiffness. When the additional amount of EMA-GMA exceeds 10%, the mechanical properties and fluidity of the alloy begin to decline significantly. EMA-GMA within 15% can promote PMMA/ASA compatibility. © Published under licence by IOP Publishing Ltd.

关键词： Fluidity

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