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Robust interfacial bonding achieved via phase separation induced by enhanced Al diffusion during AZ31/high-entropy alloy friction stir welding

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Journal of Magnesium and Alloys 2025年第3期13卷 1012-1019页

作者： Gaohui Li Haining Yao Boyuan Fu Ke Chen Katsuyoshi Kondoh Nannan Chen Min Wang School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Key Laboratory of Materials Laser Processing and Modification Shanghai Jiao Tong UniversityShanghai 200240China Joining and Welding Research Institute Osaka UniversityIbarakiOsaka 567-0047Japan

Welding high-entropy alloy(HEA)to Mg alloy has gained increasing attention for multi-metal structure design,while intrinsic sluggish diffusion kinetics of HEA conﬁnes diffusion-controlled interfacial reactions and makes it challenging to establish robust metallurgical *** study investigated welding of FeCoCrNiMn HEA to commercial AZ31 as a model combination to pioneer thisﬁ*** phase separation phenomenon was observed,with the diffusion accelerated by in-situ engineering a submicron-scale thick(∼400–500 nm)HEA nearby the interface into nanocrystalline-structure during friction stir *** grain boundaries generated in this nanocrystalline-interlayer serve as diffusion short-circuits and energetically preferred nucleation-sites,which promoted Al in AZ31 to diffuse into HEA and triggered quick separation into body-centered cubic AlNi-type and tetragonal FeCr-type *** and AZ31 were thus metallurgically bonded by these interfacial *** joint shows exceptional strength in tensile lap-shear testing with fracture largely occurred within AZ31 rather than right along interface as commonly reported previously for dissimilar joints.

关键词： High-entropy alloy Mg alloy Friction stir welding Diffusion Phase separation

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Effect of Post-weld Heat Treatment on the Microstructure and Mechanical Properties of 2.25Cr-1Mo-0.25V Ultra-Thick Steel Plate

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Acta Metallurgica Sinica(English Letters) 2024年第6期37卷 1104-1114页

作者： Yanyang Wu Zongye Ding Wenquan Lu Jingchao Hou Qiaodan Hu Jianguo Li Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai200444China School of Mechatronic Engineering and Automation Foshan UniversityFoshan528225GuangdongChina WuYang Iron and Steel Wugang450000HenanChina

Ensuring the homogeneous and excellent mechanical properties of 2.25Cr-1Mo-0.25V ultra-thick steel plate is the key to the production of hydrogenation reactor ***,it is required to understand the heterogeneity of microstructures and properties of ultra-thick plate after heat *** this work,the effect of post-weld heat treatment(PWHT)on the strength,plasticity,toughness and microstructures of the 193-mm-thick steel plate was investigated,and the formation mechanism of heterogeneity was *** PWHT decreased the room-and high-temperature yield strength(YS)and ultimate tensile strength(UTS)of the steel plate after normalizing and tempering(NT),while the room-and high-temperature YS and UTS decreased from the surface to the center of 193-mm-thick steel *** was attributed to the enhanced decomposition of martensite-austenite(M-A)constituents and coarsening of grains and precipitated carbides.

关键词： Cr-Mo steel Ultra-thick steel plate Microstructure Mechanical properties Heterogeneity

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Arc and Droplet Behaviors in Horizontal Short-Arc Pulsed Gas Metal Arc Welding of 9%Ni Steel with ERNiCrMo-3 Welding Wire

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Journal of shanghai Jiaotong university(Science) 2024年第2期29卷 361-376页

作者：刘轶玮华学明吴东升李芳蔡艳王欢杨修荣 Shanghai Key Laboratory of Material Laser Processing and Modification Shanghai Jiao Tong UniversityShanghai 200240China Hudong-Zhonghua Shipbuilding(Group)Co. Ltd.Shanghai 200129China Zhuhai Cowin Welding Equipment&Consumables Co. Ltd.Zhuhai 519015GuangdongChina

Short-arc pulsed gas metal arc welding(P-GMAW)was used to solve the dificulties of molten pool spreading and droplet transfer of Ni-based welding *** of short-circuit current was used to reduce *** length stabilizer was used to acquire a proper and stable arc length maintained at the critical position where short circuit starts to ***-arc P-GMAW with or without arc length stabilizer was *** droplet transfer,arc behaviors and weld bead profiles were investigated and compared based on the high-speed photography and observation of weld *** the arc length stabilizer was deactivated,the arc length was unstable and too *** droplet transfer mode was mainly short circuit partial transfer,with only a small part of the droplet transferred into the molten pool,with the characteristics of no obvious necking,a few spatters,small droplet impact,long short circuit duration and high short-circuit *** was also a small proportion of short circuit complete transfer with obvious necking,larger droplet impact,shorter short-circuit duration and lower short-circuit *** arc length stabilizer,droplet transfer modes were short circuit complete transfer and spray *** spray transfer had the largest droplet impact,no short circuit and no *** the arc length stabilizer activated,a deep penetration,a high penetration ratio,a small reinforcement and a large reinforcement factor were *** provides an innovative method to solve the difficulties of droplet transfer and molten pool spreading and eliminate the incomplete fusion in the GMAW of 9%Ni steel with nickel-based alloy welding wire.

关键词： droplet transfer arc behaviors weld bead formation short-arc pulsed gas metal arc welding(P-GMAW) high nickel alloy 9%Ni steel

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Effect of Grain Size and Compression Direction on the Hot Deformation Characteristics of High-Cr Ultra-Super-Critical Rotor Steel with Columnar Grains

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Acta Metallurgica Sinica(English Letters) 2023年第5期36卷 803-813页

作者： Yanyang Wu Qiaodan Hu Zongye Ding Jianguo Li Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China School of Mechatronic Engineering and Automation Foshan UniversityFoshan528225China WuYang Iron and Steel Wugang450000China

The columnar grains with a duplex grain size distribution in the ingot increase the difficulty of the hot forging of the as-cast high Cr ultra-super-critical rotor *** hot deformation behaviors of the high Cr steel with different initial grain sizes under various compression directions were *** results show that the hot deformation characteristic is strongly grain size and compression direction *** finer grain size and compression direction perpendicular to the columnar grains increase the flow stress and activation energies of hot deformation,comparing with the large grain and deformation direction parallel to the columnar *** relationships between flow stress and deformation parameters for the different initial structures conform to the established constitutive *** former enhances the critical stress of the dynamic recrystallization(DRX),inhibiting the occurrence of DRX and reducing the dimensions of DRX grains.

关键词： High Cr ultra-super-critical rotor steel Solidification Hot deformation Dynamic recrystallization Critical stress

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Thin Molten Pool Behaviors in Blue laser Microjoining Marangoni stress determines the stability of the thin molten pool in blue laser microjoining

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WELDING JOURNAL 2022年第11期101卷 269-280页

作者： Wu, D. Sun, J. Li, Z. Huang, J. Feng, K. Shanghai Key Laboratory of Material Laser Processing and Modification Shanghai Jiao Tong University Shanghai China School of Electromechanical Engineering Guangdong University of Technology Guangzhou China Yibin Innovation Center for Advanced Materials Yibin China

Thin copper materials are difficult to weld using infrared lasers (IR) due to their low energy absorption, A blue laser with a wavelength of 450 nm strongly increases energy absorption and successfully realized the microjoining of a copper material with a thickness of 0.1 mm. The dynamic behaviors of a thin molten pool were investigated by a numerical simulation using a new blue laser heat source model. At both the top and bottom surfaces of the thin molten pool, the liquid metal flowed outward under the driving of Marangoni stress. The stability of the thin molten pool was studied, showing that Marangoni stress promoted the melt-through of the thin molten pool, while the viscous resistant stress, buoyant force, and surface tension pressure had minor influences on it. The Peclet and Marangoni numbers were adopted to predict the stability of the thin molten pool.

关键词： Blue laser Microjoining Energy Absorption Thin Molten Pool Copper material

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3D morphological evolution and growth mechanism of proeutectic FeAl_(3) phases formed at Al/Fe interface under different cooling rates

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Journal of materials Science & Technology 2022年第21期116卷 83-93页

作者： Naifang Zhang Qiaodan Hu Zongye Ding Wenquan Lu Fan Yang Jianguo Li Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong University200240 ShanghaiChina School of Mechanical Engineering Shanghai Jiao Tong University200240 ShanghaiChina

The 3D morphologies and growth mechanisms of proeutectic FeAl_(3) at the Al/Fe interface under different cooling rates were studied by synchrotron X-ray *** increasing cooling rate,FeAl_(3) crystals developed from faceted polygonal prism,plates with flat surface,thin ribbon-like with periodic undulating surface to non-faceted rods with radial dendrites in cross section,indicating a gradual interface growth mode transition from two-dimensional layer growth to continuous *** a higher cooling rate,twinning mechanism plays a leading role in the formation and growth of FeAl_(3).A link between the morphologies,twinning and crystallographic structure was established based on quantitative analyses on the 3D structures.

关键词： Solidification 3D morphology FeAl_(3)Internetallic compounds Cooling rate Synchrotron radiation Al/Fe interface

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Chemical, microstructure, and mechanical property of TiAl alloys produced by high-power direct laser deposition

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Journal of materials Science & Technology 2022年第22期117卷 99-108页

作者： Xinyu Zhang Chuanwei Li Mengyao Zheng Xudong Yang Zhenhua Ye Jianfeng Gu Institute of Materials Modification and Modeling School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Materials Genome Initiative Center Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Key Laboratory of Materials Laser Processing and Modification Shanghai Jiao Tong UniversityShanghai 200240China

Additive manufactured metals sometimes exhibit extraordinary microstructures and mechanical properties due to the particular processes. In this paper, we focus on a novel gradient TiAl alloys fabricated byhigh-power direct laser deposition, whose chemical composition, microstructure, and mechanical property vary along the building direction. The results indicate that Al concentration dramatically decreasesfrom 39.5 at.% to 30.1 at.% as the height increases from the bottom to the top. Meanwhile, microstructural characterization indicates that the specimen appears basket-weave microstructure at the bottom,then the α_(2) and γ phase gradually decrease, and eventually it transforms into acicular martensite microstructure in the top region. The indentation analysis shows that the associated hardness increases asthe height increases, while the plasticity reaches a minimum value in the middle region. The increasingamount of β_(o)(ω) is considered to be responsible for the increasing hardness because of the strong precipitation strengthening effect. The high plasticity in the bottom and top regions results from the strongdeformation behaviors of the γ and β_(o) phases.

关键词： Direct laser deposition TiAl alloys Inhomogeneity Microstructure Mechanical properties

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Effects of post annealing on the microstructure,precipitation behavior,and mechanical property of a(CoCrNi)_(94)Al_(3)Ti_(3)medium-entropy alloy fabricated by laser powder bed fusion

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Journal of materials Science & Technology 2023年第4期135卷 142-155页

作者： Zhuang Li Pengcheng Zhao Tiwen Lu Kai Feng Yonggang Tong Binhan Sun Ning Yao Yu Xie Bolun Han Xiancheng Zhang Shantung Tu Key Laboratory of Pressure Systems and Safety Ministry of EducationSchool of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China College of Automobile and Mechanical Engineering Changsha University of Science and TechnologyChangsha 410114China

The additive manufacturing of multi-principal element alloys has remarkable potential for industrial *** this study,a(CoCrNi)_(94)Al_(3)Ti_(3)medium-entropy alloy(MEA)with adequate strength-ductility synergy was prepared via laser powder bed *** microstructural evolution,mechanical property,and deformation mechanisms of the MEA were investigated after post annealing for a short period(0.5 h)at a temperature range of 773-1373 K using various microstructural characterization techniques and quantitative *** static recrystallization temperature of the(CoCrNi)_(94)Al_(3)Ti_(3)MEA ranged from 973 to 1073 *** average grain size first decreased and then increased,while the dislocation den-sity persistently decreased and texture gradually weakened with increasing annealing ***-richσ-phase precipitates formed after 1073 K and then gradually dissolved at 1373 K,while Ni,Al,and Ti elements were aggregated to form a small amount of fine L1_(2)coherent precipitates with an aver-age diameter of approximately 70 nm at 1373 *** evolution of the dislocation density,grain size,and precipitates significantly influenced the propensity of deformation twins and stacking faults,which consequently affected the strain hardening behavior and mechanical *** quantitative calcu-lation of strengthening mechanisms showed that dislocation strengthening played a dominant role at annealing temperatures below 1073 K,and it significantly weakened at 1373 *** and grain boundary strengthening both markedly increased owing to the formation of precipitation particles and recrystallization-induced grain refinement after annealing at 1073 K.

关键词： Medium-entropy alloy Additive manufacturing Heat treatment Strengthening mechanism Microstructural evolution

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Numerical study of keyhole behaviors and thermal fluid flow in high current plasma arc welding

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Weld...

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Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society 2021年第2期38卷 40S-43S页

作者： Wu, Dongsheng Tashiro, Shinichi Hua, Xueming Tanaka, Manabu Osaka University Japan Shanghai Key Laboratory of Material Laser Processing and Modification Shanghai Jiao Tong University China

A fully coupled plasma arc-keyhole-weld pool model was developed to investigate the keyhole behaviors and thermal fluid flow in high current plasma arc welding. The relationship between the forces distribution and fluid flow patterns was revealed. Owing to a constraint effect of the water cooling nozzle, the plasma arc flows downward with high energy and momentum, so a large keyhole forms. Inside the keyhole, the plasma arc mainly flows downward, and very few plasma arc flows upward along the keyhole wall. At the top surface of the keyhole, the plasma arc flows outward. The dominant downward plasma shear stress and negative arc pressure in the z direction cause a dominant anti-clockwise eddy in the weld pool. The outward plasma arc shear stress on the top weld pool surface causes a small clockwise eddy in the weld pool. © 2020 Japan Welding Society. All rights reserved.

关键词： Plasma welding

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Simultaneous tuning of particle size and phase composition of TiO_(2-δ)nanoparticles by a simple liquid immiscibility strategy

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Journal of materials Science & Technology 2023年第14期145卷 1-6页

作者： Cen Wang Xuan Ge Huiqing Fan Fan Yang Qiaodan Hu Jianguo Li Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710072China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Titanium dioxide(TiO_(2))has broad applications in photo(electro)catalysis,sensors,batteries,supercapacitors,pol-lutant degradation and so on[1-5].Pure TiO_(2)has a band gap of 3.0-3.2 eV,which limits its optical abso... 详细信息

关键词： Titanium size phase

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