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Microstructure and mechanical properties of friction stir welding joint during post weld heat treatment with different zigzag lines

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Rare Metals 2019年第11期38卷 1070-1077页

作者： Zhi-Li Hu Qiu Pang Ming-Liang Dai Hubei Key Laboratory of Advanced Technology of Automobile Components Wuhan University of TechnologyWuhan 430070China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of TechnologyWuhan 430070China School of Mechanical and Electrical Engineering Wuhan Donghu UniversityWuhan 430212China

Zigzag line is a common defect in friction stir welding(FSW) *** formation mechanism of the zigzag line in Al-Cu alloy FSW joint and its influence on the microstructure and mechanical properties during post weld heat treatment(PWHT) were studied by scanning electron microscopy(SEM),microhardness and tensile *** is found that the occurrence of zigzag line for PWHT joint is determined by PWHT process which in nature depends on residual stress and thermal stress of FSW *** optimization of PWHT process to reduce the residual and thermal stress can trigger for the deterioration of mechanical properties of PWHT joints with zigzag *** obvious decrease of tensile properties is observed for T6-450 and T6-495 joints although zigzag line appears in the *** determines the sizes of zigzag line cracks and consequently determines the fracture location and characteristics of FSW joint.

关键词： Friction stir welding Post weld heat treatment Zigzag line Mechanical properties

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Finite element analysis of deformation characteristics in cold helical rolling of bearing steel-balls

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Journal of Central South University 2015年第4期22卷 1175-1183页

作者：曹强华林钱东升 School of Materials Science and Engineering Wuhan University of Technology Hubei Key Laboratory of Advanced Technology of Automotive Parts (Wuhan University of Technology) School of Automotive Engineering Wuhan University of Technology

Due to the complexity of investigating deformation mechanisms in helical rolling(HR) process with traditional analytical method, it is significant to develop a 3D finite element(FE) model of HR process. The key forming conditions of cold HR of bearing steel-balls were detailedly described. Then, by taking steel-ball rolling elements of the B7008 C angular contact ball bearing as an example, a completed 3D elastic-plastic FE model of cold HR forming process was established under SIMUFACT software environment. Furthermore, the deformation characteristics in HR process were discovered, including the forming process, evolution and distribution laws of strain, stress and damage based on Lemaitre relative damage model. The results reveal that the central loosening and cavity defects in HR process may have a combined effect of large negative hydrostatic pressure(positive mean stress)caused by multi-dimensional tensile stresses, high level transverse tensile stress, and circular-alternating shear stress in cross section.

关键词： cold helical rolling finite element(FE) simulation rotary forming bearing steel-balls

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Defect band formation in high pressure die casting AE44 magnesium alloy

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China Foundry 2022年第3期19卷 201-210页

作者： Ying-ying Hou Meng-wu Wu Feng Huang Xiao-bo Li Shou-mei Xiong Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

The characteristics of defect bands in the microstructure of high pressure die casting(HPDC)AE44 magnesium alloy were *** attention was paid to the effects of process parameters during the HPDC process and casting structure on the distribution of defect *** show that the defect bands are solute segregation bands with the enrichment of Al,Ce and La elements,which are basically in the form of Al_(11)RE_(3) *** is no obvious aggregation of porosities in the defect *** width of the inner defect band is 4-8 times larger than that of the outer *** variation trends of the distribution of the inner and outer defect bands are not consistent under different process parameters and at different locations of *** is due to the discrepancy between the formation mechanisms of double defect *** filling and solidification behavior of the melt near the chilling layer is very complicated,which finally leads to a fluctuation of the width and location of the outer defect *** affecting the content and aggregation degree of externally solidified crystals(ESCs)in the cross section of die castings,the process parameters and casting structure have a great influence on the distribution of the inner defect band.

关键词： high pressure die casting magnesium alloy AE44 defect band microstructure

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DrivAer Transformer: A high-precision and fast prediction method for vehicle aerodynamic drag coefficient based on the DrivAerNet++ dataset

arXiv

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arXiv 2025年

作者： He, Jiaqi Luo, Xiangwen Wang, Yiping Hubei Key Laboratory of Advanced Technology of Automotive Parts Wuhan University of Technology Wuhan China Wuhan National Laboratory for Optoelectronic Huazhong University of Science and Technology Wuhan China

At the current stage, deep learning-based methods have demonstrated excellent capabilities in evaluating aerodynamic performance, significantly reducing the time and cost required for traditional computational fluid dynamics (CFD) simulations. However, when faced with the task of processing extremely complex three-dimensional (3D) vehicle models, the lack of large-scale datasets and training resources, coupled with the inherent diversity and complexity of the geometry of different vehicle models, means that the prediction accuracy and versatility of these networks are still not up to the level required for current production. In view of the remarkable success of Transformer models in the field of natural language processing and their strong potential in the field of image processing, this study innovatively proposes a point cloud learning framework called DrivAer Transformer (DAT). The DAT structure uses the DrivAerNet++ dataset, which contains high-fidelity CFD data of industrial-standard 3D vehicle shapes. enabling accurate estimation of air drag directly from 3D meshes, thus avoiding the limitations of traditional methods such as 2D image rendering or signed distance fields (SDF). DAT enables fast and accurate drag prediction, driving the evolution of the aerodynamic evaluation process and laying the critical foundation for introducing a data-driven approach to automotive design. The framework is expected to accelerate the vehicle design process and improve development *** Codes 76N15 (Primary), 76F65, 68T07 (Secondary) © 2025, CC BY-NC-ND.

关键词： Aerodynamic drag

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Effect laws and mechanisms of different temperatures on isothermal tensile fracture morphologies of high-strength boron steel

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Journal of Central South University 2015年第4期22卷 1191-1202页

作者：刘佳宁宋燕利路珏郭巍 School of Materials Science and Engineering Wuhan University of Technology Hubei Key Laboratory of Advanced Technology of Automotive Parts (Wuhan University of Technology) School of Automotive Engineering Wuhan University of Technology

The fracture behaviour and morphologies of high-strength boron steel were investigated at different temperatures at a constant strain rate of 0.1 s-1 based on isothermal tensile tests. Fracture mechanisms were also analyzed based on the relationship between microstructure transformation and continuous cooling transformation(CCT) curves. It is found that 1) fractures of the investigated steel at high temperatures are dimple fractures; 2) the deformation of high-strength boron steel at high temperatures accelerates diffusion transformations; thus, to obtain full martensite, a higher cooling rate is needed; and 3) the investigated steel has the best plasticity when the deformation temperature is 750 °C.

关键词： high-strength boron steel fracture morphology isothermal tensile test

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Numerical simulation on dendritic growth of Al-Cu alloy under convection based on the cellular automaton lattice Boltzmann method

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Chinese Physics B 2022年第9期31卷 575-586页

作者： Kang-Wei Wang Meng-Wu Wu Bing-Hui Tian Shou-Mei Xiong School of Automotive Engineering Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

A numerical model is developed by coupling the cellular automaton(CA)method and the lattice Boltzmann method(LBM)to simulate the dendritic growth of Al-Cu alloy in both two and three *** improved decentered square algorithm is proposed to overcome the artificial anisotropy induced by the CA cells and to realize simulation of dendritic growth with arbitrary *** on the established CA-LBM model,effects of forced convection and gravity-driven natural convection on dendritic growth are *** simulation results show that the blocking effect of dendrites on melt flow is advanced with a larger number of *** competitive growth of the converging columnar dendrites is determined by the interaction between heat flow and forced ***-driven natural convection leads to highly asymmetric growth of equiaxed *** sinking downwards of the heavy solute,chimney-like or mushroom-like solute plumes are formed in the melt in front of the columnar dendrites when they grow along the gravitational *** details on dendritic growth of Al-Cu alloy under convection are revealed by 3D simulations.

关键词： simulation cellular automaton dendritic growth melt convection

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Application of novel force control strategies to enhance robotic abrasive belt grinding quality of aero-engine blades

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Chinese Journal of Aeronautics 2019年第10期32卷 2368-2382页

作者： Xiaohu XU Dahu ZHU Haiyang ZHANG Sijie YAN Han DING State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China 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 430074China Wuxi CRRC Times Intelligent Equipment Co. Ltd.Wuxi 214174China

Robotic belt grinding has emerged as a finishing process in recent years for machining components with high surface finish and *** surface machining consistency,however,is difficult to be guaranteed in such a *** overcome this problem,a method of hybrid force-position control combined with PI/PD control is proposed to be applied in robotic abrasive belt grinding of complex *** signals are firstly obtained and transformed to force information with signal conditioning ***,zero drift and gravity compensation algorithms are presented to calibrate the F/T transducer which is installed on the robot ***,a force control strategy combining hybrid force-position control with PI/PD control is introduced to be employed in robotic abrasive belt grinding operations where the force control law is applied to the Z direction of the tool frame and the positon control law is used in the X direction of the tool ***,the accuracy of the F/T transducer and the robotic force control system is analyzed to ensure the stability and reliability of force control in the robotic grinding ***,two typical cases on robotic belt grinding of a test workpiece and an aero-engine blade are conducted to validate the practicality and effectiveness of the force control technology proposed.

关键词： Gravity compensation Hybrid force-position control PI/PD control Robotic belt grinding Zero drift compensation

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Modeling studies on divorced eutectic formation of high pressure die cast magnesium alloy

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China Foundry 2018年第1期15卷 58-65页

作者： Meng-wu Wu Lin Hua Shou-mei Xiong Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan 430070 China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan 430070 China School of Materials Science and Engineering Tsinghua University Beijing 100084 China

The morphology and content of the divorced eutectic in the microstructure of high pressure die casting(HPDC) magnesium alloy have a great influence on the final performance of castings. Based on the previous work concerning simulation of the nucleation and dendritic growth of primary α-Mg during the solidification of magnesium alloy under HPDC process, an extension was made to the formerly established CA(Cellular Automaton) model with the purpose of modeling the nucleation and growth of Mg-Al eutectic. With a temperature field and solute field obtained during simulation of the primary α-Mg dendrites as the initial condition of the modified CA model, modeling of the Mg-Al eutectic with a divorced morphology was achieved. Moreover, the simulated results were in accordance with the experimental ones regarding the distribution and content of the divorced eutectic. Taking a "cover-plate" die casting with AM60 magnesium alloy as an example, the rapid solidification with a high cooling rate at the surface layer of the casting led to a fine and uniform grain size of primary α-Mg, while the divorced eutectic at the grain boundary revealed a more dispersed and granular morphology. Islands of divorced eutectic were observed at the central region of the casting, due to the existence of ESCs(Externally Solidified Crystals) which contributed to a coarse and non-uniform grain size of primary α-Mg. The volume percentage of the eutectic β-Mg_(17)Al_(12) phase is about 2%-6% in the die casting as a whole. The numerical model established in this study is of great significance to the study of the divorced eutectic in the microstructure of die cast magnesium alloy.

关键词： magnesium alloy high pressure die casting divorced eutectic microstructure simulation

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Simulation of dendritic growth of magnesium al oys with fluid flow

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China Foundry 2017年第5期14卷 359-364页

作者： Meng-wu Wu Zhi-peng Guo Shou-mei Xiong 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 School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

Fluid flow has a significant impact on the microstructure evolution of alloys during solidification. Based on the previous work relating simulation of the dendritic growth of magnesium alloys with hcp(hexagonal closepacked) structure, an extension was made to the formerly established CA(cellular automaton) model with the purpose of studying the effect of fluid flow on the dendritic growth of magnesium alloys. The modified projection method was used to solve the transport equations of flow field. By coupling the flow field with the solute field, simulation results of equiaxed and columnar dendritic growth of magnesium alloys with fluid flow were achieved. The simulated results were quantitatively compared with those without fluid flow. Moreover, a comparison was also made between the present work and previous works conducted by others. It can be concluded that a deep understanding of the dendritic growth of magnesium alloys with fluid flow can be obtained by applying the present numerical model.

关键词： magnesium alloy dendritic growth cellular automaton method fluid flow

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Design of Internal Resistance Detection System for Retired Lithium-ion Batteries

Design of Internal Resistance Detection System for Retired L...

引用

2020 International Conference on New Energy and Sustainable Development, NESD 2020

作者： Yang, Haoyuan Yang, Shengbing Liu, Yihui Hubei Key Laboratory of Advanced Technology for Automotive Components Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology Wuhan Hubei430070 China

Aiming at the echelon utilization of retired lithium-ion battery, an internal resistance detection system based on pulse discharging was designed. Taking STM32F103ZGT6 as the MCU of the lower computer, the collection circuits of voltage and current are designed, and the internal resistance of the battery is estimated by the collected information. The upper computer operation software is compiled, and the test results are stored in the database, which is convenient for management and query. © Published under licence by IOP Publishing Ltd.

关键词： Lithium-ion batteries

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