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Wettability and Interfacial Reactions Between Metallic Glass Melts and Cu/Mo Used as roller Materials for twin-roll casting

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Acta Metallurgica Sinica(English Letters) 2022年第7期35卷 1221-1230页

作者： Yi Wu Long Zhang Hongwei Zhang Huameng Fu Zhengwang Zhu Hong Li Aimin Wang Haifeng Zhang Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China

twin-roll casting has been recently revealed to be an effi cient technique to produce rejuvenated metallic glass(MG)*** to the high melting point and high hardness,pure Mo is considered as a good roller material as pure ***,the wettability and interfacial reactions between MG melts and Cu or Mo remain largely *** this work,a series of sessile droplet wetting experiments are designed to investigate the wettability and reactions between Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5)(Vit.1)or(Zr 0.401 Ti_(0.133)Cu_(0.118)Ni_(0.101)Be_(0.247))_(99)Nb_(1)(Nb1)MG melts and Cu/Mo substrates at temperatures of 1073,1123 and 1173 *** is found that the wettability and interfacial reactions of the Vit.1 and Nb1 MG melts on the Cu substrates are very *** equilibrium contact angles are~30°at 1073 K and~25°-27°at 1123 *** MG melts completely spread out on the Cu substrates at 1173 *** substrates are slightly dissolved in the MG melts event at 1073 K,and a transitional reaction layer exists between the droplet and the Cu *** comparison,the Vit.1 MG melt exhibits a much improved wettability on the Mo *** equilibrium contact angle of the Vit.1/Mo is only 6°at 1073 K and 5°at 1123 *** signifi cant diff usion of Mo into the droplet occurs even at 1173 K with a holding time of~30 *** interfaces of the Vit.1/Mo samples are sharp,and no interfacial reaction layers *** fi ndings indicate that pure Mo can be a good roller material for twin-roll casting at high temperatures,and the Mo-made rollers are expected of capability to produce MG strips with good quality.

关键词： Metallic glass Wettability Interfacial reaction twin-roll casting roller material

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A Decoupling Control Model on Perturbation Method for twin-roll casting Magnesium Alloy Sheet

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Journal of Materials Science & Technology 2015年第5期31卷 517-522页

作者： Wenyu Zhang Dongying Ju Hongyang Zhao Xiaodong Hu Yao Yao Yujun Zhang School of Software University of Science and Technology Liaoning School of Materials and Metallurgy University of Science and Technology Liaoning School of Mechanical Engineering and Automation University of Science and Technology Liaoning

To better understand the twin-roll casting process,based on the analysis of the solidification phenomenon,the geometry shape of the molten metal pool,the continuity of metal and the balance of energy and momentum,five critical partial equations were established separately including the equations of pool level,solidification process,roll separating force,roll gap and casting ***,to obtain a uniform sheet thickness and keep a constant roll separating force,a decoupling control model was built on the perturbation method to eliminate the interference of process *** simulation results show that the control model is valuable to quickly and accurately determine the control ***,Mg alloy sheets with high quality were cast by applying this model.

关键词： twin-roll casting Decoupling control model Perturb

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Kinetics of recrystallization for twin-roll casting AZ31 magnesium alloy during homogenization

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International Journal of Minerals,Metallurgy and Materials 2011年第5期18卷 570-575页

作者： Hu Zhao Pei-jie Li Liang-ju He National Center of Novel Materials for International Research Tsinghua University Beijing 100084 China

The kinetics of recrystallization for twin-roll casting AZ31 magnesium alloy with different thicknesses during homogenization was *** is shown that fine grains are first formed at the boundaries of deformed bands in the twin-roll casting *** recrystallized grains with no strain are gradually substituted for the deformed microstructure of twin-roll casting AZ31 magnesium *** incubation temperature and time for the recrystallization of a twin-roll casting AZ31 magnesium alloy strip with a thickness of 3 mm are lower and shorter than those of the 6-mm thick strip,*** 3-mm thick twin-roll casting magnesium alloy has finer grains than the 6-mm thick *** activation energies of recrystallization for twin-roll casting AZ31 magnesium alloy slabs with the thickness of 3 and 6 mm are 88 and 69 kJ/mol,*** kinetics curves of recrystallization for twin-roll casting AZ31 magnesium alloy were obtained.

关键词： magnesium alloys twin-roll casting homogenization kinetics grain size

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A New Analytical Model for the Flow Stress of twin-roll casting Magnesium Sheet at Elevated Temperatures

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Journal of Materials Science & Technology 2010年第5期26卷 461-466页

作者： Zhimin Liu,Shuming Xing ,Peiwei Bao,Nan Li,Shuqing Yao and Milan Zhang School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing 100044,China [a] School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing 100044 China

To evaluate the flow stress of the twin-roll casting magnesium sheet in high temperature forming processes,a new analytical model was proposed by analyzing stress-strain curves measured under various temperatures and strain *** model can be parameterized to reflect the volume fraction of semi-sold grain and sold grains undergoing *** applying the new model,the result showed that the simulated stress-strain curves fit the experiment data very *** curve fitting can be employed for any magnesium sheet when the deformation conditions are *** evolution indicated that it affected the stress-strain curves *** mechanisms of dynamic recrystallization（DRX） depended on the operating deformation mechanisms,which changed with *** the volume fraction and grain size of DRX changed with the Zener-Hollomon parameter and temperatures.

关键词： twin-roll casting Semi-sold grains twinning

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Generalized stability criterion for controlling solidification segregation upon twin-roll casting

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Journal of Materials Science & Technology 2023年第3期134卷 163-177页

作者： Pan Wu Yubing Zhang Jiaqi Hu Shaojie Song Yong Li Huiyuan Wang Guo Yuan Zhaodong Wang Shizhong Wei Feng Liu State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Analytical and Testing Center Northwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of rolling and Automation Northeastern UniversityShenyang 110819China State Key Laboratory of Super hard Materials Jilin UniversityChangchun 130012China National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials Henan University of Science and TechnologyLuoyang 471003China

Macro-and micro-segregation formed upon twin-roll casting(TRC)can be inherited from sub-rapid solid-ification to solid-state transformation,even to plastic deformation,thus deteriorating drastically mechan-ical properties of as-produced thin *** many works focusing mainly on controlling fields of thermal,concentration and convection have been reported,how to control artificially and quantitatively the segregation using a theoretical connection between processing parameters and solidification models,has not been realized,*** it,a systematical framework integrating non-equilibrium dendritic growth and overall solidification kinetics with the TRC parameters,was constructed applying a general-ized stability(GS)conception deduced from transient thermodynamic driving force△G^(t)and transient ki-netic energy barrier Q_(eff)^(t)evolving upon *** from this framework considering synergy of thermodynamics and kinetics(i.e.,thermo-kinetic synergy),a criterion of high△G^(t)-high GS guaranteed that the macro(i.e.,the centerline)and the micro(i.e.,the edge)segregation can be suppressed by in-creasing△G^(t)and GS at the beginning and the ending stage of sub-rapid solidification,*** typical thermo-kinetic combination producing the microstructure can be inherited into the plastic de-formation,as reflected by corresponding strength-ductility *** work realized quantitative controlling of TRC by a theoretical connection between processing parameters and solidification models,where,an optimization for sub-rapid solidification segregation using the GS conception including△G^(t)and Q_(eff)^(t)has been performed.

关键词： Segregation Sub-rapid solidification Generalized stability twin-roll casting Thermo-kinetics

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Physical and computational study of a novel submerged entry nozzle design for twin-roll casting process

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Journal of Iron and Steel Research International 2021年第11期28卷 1390-1399页

作者： Mian-guang Xu Miao-yong Zhu School of Mechanical Engineering Shandong University of TechnologyZibo 255000ShandongChina School of Metallurgy Northeastern UniversityShenyang 100819LiaoningChina

With significant emphasis on reducing the turbulence in the bath and the need for effective distribution of metal along the roller length in twin-roll casting,a novel submerged entry nozzle(SEN)configuration with two“gap regions”was ***“gap regions”of the new SEN divide the bath into two parts,the“upper melt bath”(casting region)and the“lower melt bath”(rolling region).The newly designed SEN was tested by using both full-scale water modeling experiments and numerical *** demonstrated that the turbulence could only be found near the rotating roller ***“gap regions”can make the near-wall flows more *** can also prevent the instabilities in the“upper melt bath”to be transferred to the“lower melt bath”,thus improving the stability of the ***,the novel SEN can stabilize the meniscus where the initial solidification *** is achieved by increasing the SEN immersion depth,which in turn,can enlarge the volume of the upper part of the bath.

关键词： twin-roll casting Submerged entry nozzle Water model Numerical simulation

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AlN Precipitates and Microstructure in Non-oriented Electrical Steels Produced by twin-roll casting Process

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Acta Metallurgica Sinica(English Letters) 2013年第4期26卷 483-488页

作者： Ting ZHANG Xiaoming ZHANG Zhiyuan GUO Yuqian WANG Chenggang LI Liangyun LAN The State Key Laboratory of rolling and Automation Northeastern University Laiwu Iron and Steel Group Co.Ltd

Aluminum nitride （AIN） precipitates and microstructure of 4 wt.% （Si＋AI） non-oriented electrical steel were investigated. The 2.0 mm thick cast strips with three different silicon/aluminum （Si/AI） ratios were produced by twin-roll casting process, then the strips were reheated, warm rolled, cold rolled and annealed. The microstructure and AIN precipitates were characterized using optical microscopy, scanning electron microscopy and transmission electron microscopy. The results showed that with the increase of Si/AI ratio, on the one hand, the casting microstructure changed from columnar grains to equiaxed grains, and the uniformity of annealed microstructure was improved; On the other hand, the number of AIN precipitates in cast strips reduced meanwhile the distribution became dispersed. By the reheat treatment, the size and distribution of the AIN precipitates can be changed. Moreover, the grain size of the annealed strips is in the range of 20-50 #m, at the same time, many AIN precipitates were located at grain boundaries. Therefore, controlling the Si/AI ratio is a simple method to obtain desired microstructure. Then AIN precipitates in non-oriented electrical steel prepared by twin-roll casting process hinder markedly the recrystallized grains growth, A compatible reheat treatment can be an approach worth exploring to control the behavior of AIN precipitates.

关键词： twin-roll casting Non-oriented electrical steels Microstructure Aluminum nitride

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Microstructure,tensile properties and free bulge formability of Sr-and Y-containing AZ31 alloy sheet produced by twin-roll casting and sequential hot rolling

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Rare Metals 2020年第10期39卷 1202-1209页

作者： Peng Jiang Luo-Bin Li Yan-Dong Yu Wang-Ping Wu Zhi-Zhi Wang Yi Zhang Nai-Ming Miao School of Mechanical Engineering Changzhou High Technology Research Key Laboratory of Mould Advanced ManufacturingChangzhou UniversityChangzhou 213164.China Jiangsu Key Laboratory of Green Process Equipment Changzhou UniversityChangzhou 213164.China School of Materials Science and Engineering Harbin University of Science and TechnologyHarbin 150040China

The effects of Sr and Y on microstructure,tensile property and free bulge formability of AZ31 alloy sheet produced by twin-roll casting and sequential hot rolling were investigated to improve the mechanical properties and formability of the AZ31 *** and Y addition can form Al4 Sr,Al2 Y and Al3 Y phases which can impede dislocation movement and promote dynamic recrystallization during the rolling deformation and decrease the lattice resistance to dislocation motion by decreasing Al solubility in the alloy,resulting in finer grains,lower dislocation density and no twinning generating in the twin-roll casting and sequential hot rolling(TRC-HR)AZ31-1.3 Sr-1.0 Y *** maximum stress and elongation of the alloy increase significantly after adding Sr and *** average cavity and grain sizes of the TRC-HR AZ31-1.3 Sr-1.0 Y alloy are smaller,resulting in higher elongation in the *** addition of Y and Sr can effectively improve the free bulge formability and the thickness uniform of the *** Al4 Sr,Al2 Y and A13 Y phases can inhibit the grain growth by obstructing dislocation motion or grain boundary slip,resulting in smaller grain size of AZ31-1.3 Sr-1.0 Y alloy bulge parts.

关键词： AZ31 alloy Strontium Yttrium twin-roll casting Tensile properties Free bulge formability

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Thermal Flow Simulation of twin-roll casting Magnesium Alloy

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Journal of Shanghai Jiaotong university(Science) 2012年第4期17卷 479-483页

作者：胡小东巨东英赵红阳 School of Materials Science and Engineering University of Science and Technology Liaoning

In order to better understand twin-roll casting process,a 3D finite element method(FEM) simulation was carried out,based on the conditions of the pilot vertical twin-roll caster,to study the thermal flow and solidification behavior in the twin-roll casting *** simulation results show that non-uniform temperature and velocity distribution near the side dam region are the main reason for causing non-uniform solidification and non-uniform deformation along the cast sheet ***,it is necessary to preheat the side dams or improve the design of nozzle to compensate the effect of side dams on the casting *** quality magnesium sheets have been cast after improved the casting devices.

关键词： twin-roll casting thermal flow simulation magnesium alloy sheet

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Effect of twin-roll casting parameters on microstructure and mechanical properties of AA5083-H321 sheet

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Transactions of Nonferrous Metals Society of China 2016年第10期26卷 2552-2560页

作者： A.HOSEINIFAR S.SALARI M.SOLTAN ALI NEZHAD Department of Materials Science and Engineering School of Engineering Shiraz University Department of Mining and Metallurgical Engineering Amirkabir University of Technology Metallurgical and Materials Engineering Department Faculty of EngineeringFerdowsi University of Mashhad

Thepurpose of the present paper is to study the mechanical propertiesand microstructureof the twin-roll cast and cold rolled AA5083 aluminum alloy sheet in strain-hardened H321 temper. To reach this goal, first, a sound surface slab of 8.90 mm thick and 1260 mm wide was cast by a 15°; tilt back twin roll caster at a casting speed of 490 mm/min. After homogenization at 520 ℃, the product was cold rolled to two thicknesses of 6.30 mm and 3.85 mm with an intermediate annealing at 370 ℃ and final stabilization at 180 ℃. Opticalmicroscopyand scanning electron microscopy （SEM） investigations of the as-cast state depicted the segregation of intermetallic particles mainly in grain boundaries which wasthe cause of grain removal observed in the fracture surface of tensile test samples. In addition, mechanical properties indicated an increase in total elongation after homogenization heat treatment dueto the elimination of the grain boundary segregations. Finally, it was observed that the properties of the 3.85 mmthick sheet were consistent with the H321 temper requirements according to ASTM B 290M standard due to applying sufficient cold reduction during cold rolling stage.

关键词： AA5083 aluminum alloy twin-roll casting cold rolling H321 strain-hardened temper

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