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A new method for evaluating wedges of steel plates and strips

Journal of Iron and Steel Research International 2024年第7期31卷 1719-1735页

作者： Xiao-bao Ma Xiao-xin Ma Tao Wang Zhong-kai Ren Yu-cheng Ren College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina Ministry of Education Engineering Research Center of Advanced Metal Composite Forming Technology and Equipment Taiyuan University of TechnologyTaiyuan 030024ShanxiChina National Key Laboratory of Metal Forming Technology and Heavy Equipment Taiyuan University of TechnologyTaiyuan 030024ShanxiChina China National Heavy Machinery Research Institute Co. Ltd.Xi'an 710018ShaanxiChina Faculty of Mechanical Engineering Hebei University of ArchitectureZhangjiakou 075000HebeiChina

To overcome the inaccuracy problem of the traditional wedge evaluation of steel plates and strips caused by the ran-domness of the thicknesses of two local points and improve the reliability of the wedge index,the double-centroid method for the wedge evaluation was proposed,and a model based on the centroid theory was ***,an integral model for the discrete thickness values of the cross-section profiles was *** discussion focused on the distinct characteristics of the two-point method,asymmetric method,and double-centroid method in evaluating the asymmetric distribution of *** three methods were employed to evaluate the wedge values of both the theoretical and measured cross-sections of steel plates and strips,and the accuracies of three wedge evaluation models were analyzed and *** results showed that the double-centroid method objectively reflects the degree and variation characteristics of the wedge values of the cross-sections of steel plates and strips,and this method is feasible,reliable,and outstanding.

关键词： Steel plate and strip Wedge Two-point method Double-centroid method Reliability

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Cast-rolling force model of multi-roll solid–liquid cast-rolling bonding process for fabricating metal cladding materials

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Chinese Journal of Aeronautics 2023年第9期36卷 346-368页

作者： Ce JI Huagui HUANG College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024China Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment of Ministry of Education Taiyuan University of TechnologyTaiyuan 030024China National Key Laboratory of Metal Forming Technology and Heavy Equipment Taiyuan University of TechnologyTaiyuan 030024China College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao 066004China

Based on twin-roll casting technology and multi-roll groove rolling technology,a Multi-Roll Solid-Liquid Cast-Rolling Bonding(MRSLCRB)process was proposed to fabricate Cu/steel cladding bars,which processes the advantages of short flow and ***,it is a typical 3-D thermal-fluid-mechanics coupled problem,and determining cast-rolling force is difficult during the equipment ***,the geometrical evolution of the cast-rolling area was studied,laying the foundation to establish contact boundary equations and analyze mechanical schematics and metal ***,a 3-D steady-state thermal-fluid coupled simulation model,including casting roll,substrate bar,and cladding metal,was *** Kissing Point(KP)height,average outlet temperature,and process window were predicted,and simulation results of the three-roll layout indicate that the KP distribution along the circumferential direction can be considered ***,the engineering cast-rolling force model was derived based on the differential element method and plane deformation *** accuracy was verified by the 3-D finite element model,and the influences of process layouts and technological parameters on the castrolling force were *** the indirect multi-field coupled analysis method,the temperature–pressure evolution and reasonable process window can be predicted,which provides a significant basis for guiding equipment design and improving product quality.

关键词： Cast-rolling force Kissing point Multi-field coupled Numerical simulation Solid-liquid cast-rolling bonding

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Precision and Flexible Bending Control Strategy Based on Analytical Models and Data Models

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Chinese Journal of Mechanical Engineering 2022年第5期35卷 112-130页

作者： Yongchuan Duan Le Tian Fangfang Zhang Yu Liu Haidi Qiao Liu Yang Yingping Guan Key Laboratory of Advanced Forming&Stamping Technology and Science Ministry of Education of ChinaYanshan UniversityQinhuangdao 066004China College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China

forming of various customized bending parts,small batches,as well as numerous types of materials is a new challenges for Industry 4.0,the current control strategies can not meet the precision and flexibility requirement,expected control strategy of bending processes need to not only resist unknown interferences of process condition and models,but also produce various new parts automatically and *** this paper,a precision and flexible bending control strategy based on analytical models and data models is proposed to build adaptive bending *** analytical prediction models for loading and unloading are established and suitable for various materials,a sequential identification strategy is proposed to search nominal properties using the four sub-optimization models.A data-based feedback model is established to prevent over-bending and eliminate online *** models are merged into a precision and flexible control *** system firstly uses sub-optimization models to search the nominal point which is near to target point,secondly the system further uses feedback model to eliminate residual error between the nominal point and target *** with four kinds sheet metals,the allowable ranges for variables are determined for a good *** target bending angles were set to 20°,40°,and 60°.Forty parts were tracked for each kind material,the adaptive bending system converged after one iteration,and exhibited better performances.

关键词： Air bending Springback control Flexible bending control Feedback compensation

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Anomalous enhancing effects of electric pulse treatment on strength and ductility of TC17 linear friction welding joints

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Journal of Materials Science & technology 2024年第36期203卷 155-166页

作者： Xin Zhang Junjie Zhang Yunkui Yao Qingsong Qiao Lixing Zhao Leichang Liu Feng Jin Mei Zhan Hongwei Li Key Laboratory of High-Performance Manufacturing for Aero Engine Ministry of Industry and Information TechnologyNorthwestern Polytechnical UniversityXi’an 710072China Engineering Research Center of Advanced Manufacturing Technology for Aero Engine Ministry of EducationNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment Northwestern Polytechnical UniversityXi’an 710072China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

Mechanical properties of TC17 titanium alloy undergo a significant reduction after linear friction welding(LFW),of which the strength and ductility are hard to be improved simultaneously by traditional aging heat treatment(AHT),seriously limiting the application of LFW in the manufacturing of TC17 titanium alloy *** this end,the present work proposes to use electric pulse treatment(EPT)to enhance the strength and ductility of TC17 LFW joints simultaneously by improving its *** results show that,in comparison to the uneven distribution ofαphases in the welding zone(WZ),heat-affected zone(HAZ),and base metal(BM)zone after AHT,EPT can selectively homogenize theαphase distribution of WZ and HAZ without impacting the *** selective effect of EPT is reflected as the synergistic influence of the local Joule heating effect and the electron wind effect,which promotes the diffusion ofβphase stabilizing element Mo and leads to a competitive precipitation ofβphase andαphase in theαphase transition temperature *** ratio ofαphase toβphase in the WZ and HAZ finally approaches an equilibrium point which is similar to that of BM,leading to a uniform distribution ofαphase and realizing the synergy of strength-ductility of LFW joint:the maximum strength increase observed is 12.9%,accompanied by a corresponding elongation increase of 122%(by AHT&EPT),and the maximum plasticity improvement is 185%,accompanied by a corresponding strength increase of 4.3%(by EPT for 1 h).This study provides essential insights for improving the strength and ductility of LFW TC17 titanium alloy blisks and enhancing the applications of LFW in aeroengine components.

关键词： Linear friction welding TC17 titanium alloy Electric pulse treatment Phase transformation Local joule heating effect

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Mesoscale deformation mechanisms in relation with slip and grain boundary sliding in TA15 titanium alloy during tensile deformation

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Journal of Materials Science & technology 2022年第3期98卷 72-86页

作者： Yanxi Li Pengfei Gao Jingyue Yu Shuo Jin Shuqun Chen Mei Zhan State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of High-Performance Precision Forming Technology and EquipmentSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Advanced Functional Materials Education Ministry of ChinaSchool of Materials Science and EngineeringBeijing University of TechnologyBeijing 100124China

Revealing the mesoscale deformation mechanisms of titanium alloy with tri-modal microstructure is of great significance to improve its mechanical properties. In this work, the collective behavior and mechanisms of slip activities, slip transfer, and grain boundary sliding of tri-modal microstructure were investigated by the combination of quasi-in-situ tensile test, SEM, EBSD and quantitative slip trace analyses. It is found that the slip behavior presents different characteristics in the equiaxed α(α_(p)) and lamellar α(α_(l))grains. Under a low level of deformation, almost all the slip deformation is governed by single basal and prismatic slips for both of α_(p)and α_(l),despite small amount of < a >-pyramidal slip exists in α_(l)grains. As deformation proceeds, < a >-pyramidal and < c + a >-pyramidal slip systems with high Schmid factors were activated in quantities. Specially, certain coarse prismatic slip bands were produced across both of single and colony α_(l)grains whose major axes tilting about 40 °–70 ° from the tensile axis. Slip transfer occurs at the boundaries of α_(p)/α_(p)and α_(l)/β under the condition that there exists perfect alignment between two slip systems and high Schmid factors of outgoing slip system. The slip transfer across α_(l)/β boundary can be divided into two types: straight slip transfer and deflect slip transfer with a deviation angle of 5 °–12 °, depending on the alignment of slip planes of two slip systems. The grain boundary sliding along boundaries of α_(l)/β and α_(p)/β was captured by covering micro-grid on tensile sample. It is found that the crystallographic orientation and the geometrical orientation related to loading axis play great roles in the occurrence of grain boundary sliding.

关键词： Titanium alloy Tri-modal microstructure Slip modes Slip transfer Grain boundary sliding

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Elastic-viscoplastic constitutive equations of K439B superalloy and thermal stress simulation during casting process

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China Foundry 2023年第5期20卷 403-413页

作者： Da-shan Sui Yu Shan Dong-xin Wang Jun-yi Li Yao Xie Yi-qun Yang An-ping Dong Bao-de Sun Institute of Forming Technology&Equipment School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200030China State Key Laboratory of Special Rare Metal Materials Northwest Rare Metal Materials Research Institute Ningxia Co.Ltd.Shizuishan 753000NingxiaChina Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

K439B nickel-based superalloy is a new type of high-temperature *** is insufficient research on its constitutive equations and numerical modeling of thermal *** tensile experiments of K439B superalloy at different temperatures(20°C-1,000°C)and strain rates(1.33×10^(-3)s^(-1)-5.33×10^(-3)s^(-1))were performed by using a Gleeble-3800 *** elastic moduli at different temperatures(20°C-650°C)were measured by resonance ***,stress-strain curves were measured for K439B superalloy under different *** elastic-viscoplastic constitutive equations were established and the correspongding parameters were solved by employing the Perzyna *** verification results indicate that the calculated values of the constitutive equations are in good agreement with the experimental *** this basis,the influence of process parameters on thermal stress was investigated by numerical simulation and orthogonal experimental *** results of orthogonal experimental design reveal that the cooling mode of casting has a significant influence on the thermal stress,while pouring temperature and preheating temperature of shell mold have minimal *** distribution of physical fields under optimal process parameters,determined based on the orthogonal experimental design results,was *** simulation results determine separately the specific positions with maximum values for effective stress,plastic strain,and displacement within the *** maximum stress is about 1,000.0 MPa,the plastic strain is about 0.135,and the displacement is about 1.47 ***,the distribution states of thermal stress,strain,and displacement are closely related to the distribution of the temperature gradient and cooling rate in the *** research would provide a theoretical reference for exploring the stress-strain behavior and numerical modeling of the effective stress of the alloy during the casting process.

关键词： nickel-based superalloy investment casting Perzyna model elastic-viscoplastic thermal stress numerical simulation

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Recrystallization effect on surface passivation of Hastelloy X alloy fabricated by laser powder bed fusion

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Journal of Materials Science & technology 2023年第32期163卷 245-258页

作者： Xing He Li Wang Decheng Kong Ruixue Li Wei Zhang Kunjie Dai Xiaoqing Ni Ketai He Chaofang Dong Beijing Advanced Innovation Center for Materials Genome Engineering Key Laboratory for Corrosion and Protection(MOE)Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Engineering Research Center of 3D Printing Materials Shanghai Research Institute of MaterialsShanghai 200437China School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China

Post-heat treatment is generally adopted in the additive manufacturing field due to its alleviation of high residual stress and modification of rapid-solidified multilevel heterogeneous microstructure,and the related performance of the heat-treated counterparts calls for a systemic investigation to build a criterion of the heat treatment *** this work,we focus on the heat treatment effects on the recrystallization of the Hastelloy X alloy produced by the laser powder bed fusion(LPBF)method,and the related surface passivation of the heat-treated counterparts is meticulously assessed as *** show that the multilevel heterostructure for LPBF Hastelloy X alloy consists of sub-micro dislocation cell substructures with Cr/Mo elemental segregation,fine columnar grains,and periodically-distributed molten *** heat treatment,partially and fully recrystallized structures for LPBF Hastelloy X alloys were achieved at 1100 and 1200℃for 1 h,***,the as-built LPBF Hastelloy X alloy shows superior corrosion resistance while the heat-treated one(1100℃)exhibits the worst in the borate buffer *** growth of passive film exhibited a highly linear correlation with the nucleation process controlled by diffusion,and high dislocation density and low angle grain boundary decreased the diffusion coefficient of cation vacancies,augmenting the nucleation sites of the passive film and enhancing its growth ***,the micro-galvanic effect resulting from the partially recrystallized microstructure actively facilitated the formation of inhomogeneous porous passive films,leading to the worst corrosion resistance.

关键词： Laser powder bed fusion Hastelloy X Recrystallization Heterogeneous microstructure Passive film

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Motion/Force Transmissibility of a 5-DOF Parallel Driving Mechanism

Motion/Force Transmissibility of a 5-DOF Parallel Driving Me...

引用

International Conference on Mechanical Design, ICMD 2023

作者： Zhang, Jinzhu Shi, Hanqing Wang, Tao Huang, Qingxue College of Mechanical and Vehicle Engineering Taiyuan University of Technology Taiyuan030024 China Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment Ministry of Education Taiyuan030024 China National Key Laboratory of Metal Forming Technology and Heavy Equipment Taiyuan030024 China

ISBN: (纸本)9789819709212

In this paper, a spatial parallel driving mechanism (PDM) with a coupling chain is proposed to generate the 5-DOF (3T2R) motion. A description of its mechanism topology is presented to investigate the characteristics of motion/force transmissibility of the 5-DOF PDM. The medial transmission wrench and equivalent transmission wrench are presented by considering the transmission wrench of the local loop mechanism. Then, the motion/force performance indices that consider the input and output transmission index and equivalent transmission index are extended to evaluate the performance of the proposed PDM. As a result, the good transmission workspace is identified under the given parameters. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Tools

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Electron Beam Powder Bed Fusion Additive Manufacturing:A Comprehensive Review and its Development in China

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Additive Manufacturing Frontiers 2024年第4期3卷 75-101页

作者： Mohan Jiao Hongyu Long Buwei Xiao Xiaoyu Liang Feng Lin State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing100084China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing100084China Bio-Manufacturing and Rapid Forming Technology Key Laboratory of Beijing Beijing100084China State Key Laboratory of Nonferrous Metals and Specialty Materials Processing Guangxi UniversityNanning530004China

Additive manufacturing(AM),recognized as a pivotal innovation,has revolutionized the manufacturing industry since its *** a robust background of over three decades in AM,China has accomplished significant milestones,emerging as a key global player in the deployment and export of related machinery and ***’s prominence within the realm of powder bed fusion technology is underscored by its substantial market *** beam powder bed fusion(EB-PBF),known for its low residual stress and high forming efficiency,has gained considerable international *** Tsinghua University initiated the first research on EB-PBF in 2004,China has steadily advanced in this area,leading to the commercialization of EB-PBF devices and the development of a diverse product *** comprehensive review highlights the research progress in EB-PBF,focusing on its development in China,explores novel technologies,and offers insights into future advancements.

关键词： Additive manufacturing Electron beam powder bed fusion Electron beam melting Materials processing Simulation

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High-strength extruded magnesium alloys:A critical review

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Journal of Materials Science & technology 2024年第32期199卷 27-52页

作者： H.Wang X.C.Luo D.T.Zhang C.Qiu D.L.Chen Guangdong Key Laboratory for Advanced Metallic Materials Processing and Forming National Engineering Research Center of Near-net-shape Forming for Metallic MaterialsSouth China University of TechnologyGuangzhou 510640China Department of Mechanical Industrial and Mechatronics EngineeringToronto Metropolitan UniversityTorontoOntario M5B 2K3Canada School of Electrical and Mechanical Engineering Guangzhou Railway PolytechnicGuangzhou 510430China

Magnesium(Mg)has great potential for application in the automotive and aerospace sectors due to its abundant resources and low ***,the industrial applications of Mg alloys are far below alu-minum *** present,most commercial Mg alloys exhibit a low yield strength of<300 MPa,and their specific strength does not exhibit an advantage over that of aluminum alloys and high-strength *** the strength of Mg alloys is one of the key topics in this *** the past two decades,high-strength Mg alloys made by powder metallurgy and severe plastic deformation techniques have been reported,but the small sample dimension and high-cost limit their industrial ***-sion can be used to fabricate bulk materials with fine-grained microstructures and improved mechanical properties,which is considered as a suitable route of producing high-strength Mg alloys at the indus-trial *** this review,recent advances in the extrusion of different Mg alloys are briefly summa-rized,including commercial Mg alloys,high-alloyed Mg-RE alloys,and Ca-containing Mg *** strengthening strategies,including alloying,grain refinement,texture modification,etc.,are employed in developing high-strength Mg alloys,with special attention to a novel strengthening mechanism,namely hetero-deformation-induced strengthening,which has recently been applied to simultaneously improve the strength and ductility of Mg ***,the heterostructured Mg alloys prepared by extrusion are also introduced in this work,and the influences of alloying elements and extrusion parameters on the preparation of heterostructured Mg alloys are discussed ***,this review summa-rizes the effect of post-extrusion treatment on the mechanical properties of extruded Mg alloys,along with a brief comparison of the mechanical properties between Mg and Al ***,some poten-tial research directions for further advancing the high-performance and low-cost extr

关键词： Magnesium alloys Extrusion Heterostructure High strength

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