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Journal of Iron and Steel Research International 2014年第2期21卷 159-165页

作者： De-wei LI Zhi-jian SU Katsukiyo MARUKAWA Ji-cheng HE Key Laboratory of Electromagnetic Processing of Materials of Ministry of Education Northeastern University

A new process for swirling flow generation in the submerged entry nozzle （SEN） in continuous casting process of steel was proposed. A rotating electromagnetic field was set up around the SEN to induce swirling flow by Lorentz force. The flow and temperature fields in the SEN and round billet mold with electromagnetic swirling were numerically simulated and then verified by the electromagnetic swirling model experiment of low melting point alloy. The effects of divergent angle of the SEN on the flow and temperature fields in mold with electromagnetic swirling were investigated. The electromagnetic swirling flow generator （EMSFG） could effectively induce swirling flow of molten steel in the SEN, which consequently improved greatly the flow and temperature fields in the mold. Below the nozzle outlet in mold, with the increase of divergent angle, the stream of bulk flow diverged more widely, the high temperature zone shifted up, and the temperature field became more uniform. Above the nozzle outlet in mold, with 350 A electromagnetic swirling, when the divergent angle of the SEN increased, the upward flow velocity and the meniscus temperature first increased and then decreased. With a divergent angle of 60~, the upward flow velocity and meniscus temperature reaced the largest value.

关键词： continuous casting process swirling flow flow field divergent angle round billet

Irradiation Behavior in High Entropy Alloys

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Journal of Iron and Steel Research International 2015年第10期22卷 879-884页

作者： Song-qin XIA Zhen WANG Teng-fei YANG Yong ZHANG State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Institute for Science and Technology Information and Strategy Central Iron and Steel Research Institute State Key Laboratory of Nuclear Physics and Technology Center for Applied Physics and TechnologyPeking University

As an increasing demand of advanced nuclear fission reactors and fusion facilities, the key requirements for the materials used in advanced nuclear systems should encompass superior high temperature property, good behavior in corrosive environment, and high irradiation resistance, etc. Recently, it was found that some selected high entropy alloys （HEAs） possess excellent mechanical properties at high temperature, high corrosion resistance, and no grain coarsening and self-healing abil- ity under irradiation, especially, the exceptional structural stability and lower irradiation-induced volume swelling, compared with other conventional materials. Thus, HEAs have been considered as the potential nuclear materials used for future fission or fusion reactors, which are designed to operate at higher temperatures and higher radiation doses up to several hundreds of displacement per atom （dpa）. An insight into the irradiation behavior of HEAs was given, including fundamental researches to investigate the irradiation-induced phase crystal structure change and volume swelling in HEAs. In summary, a brief overview of the irradiation behavior in HEAs was made and the irradiation-induced structural change in HEAs may be relatively insensi- tive because of their special structures.

关键词： high entropy alloy irradiation behavior self-healing structure change volume swelling

Microstructural Evolution and Performance of In-situ Ag-Ni Composite after Solidification under Electromagnetic Stirring and Deformation

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Journal of Iron and Steel Research International 2016年第7期23卷 638-646页

作者： Lin ZHANG Ke HAN Tian-nan MAN En-gang WANG Xiao-wei ZUO Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern University National High Magnetic Field Laboratory Florida State University

The effect of electromagnetic stirring（EMS）on microstructure and performance of Ag-8 mass%Ni composite was investigated under both solidified and deformed *** EMS,the Ag matrix formed short,thick dendrites in the ingot;whereas with EMS,dendrites were long and *** phase mainly formed particles or ribbons,distributed along boundaries between dendrite *** drawing of the solidified Ag-Ni ingots,both with and without EMS,produced high strength in-situ metal-matrix composite（MMC）consisting of Ag matrix reinforced by Ni *** improved the ductility of the composite,consequently enhancing its drawability and *** also increased the electrical conductivity in both solidified ingots and deformed in-situ composite *** both cases,hardness and tensile strength remained high.A model based on a combination of the modified linear rule of mixtures and the Hall-Petch relationship was used to rationalize the tensile strength and hardness with respect to its fabrication parameters and the microstructure of Ag-Ni in-situ composite.

关键词： Ag-Ni electromagnetic stirring solidification in-situ metal matrix composite

Numerical Analysis of Fluctuation Behavior of Steel/Slag Interface in Continuous Casting Mold with Static Magnetic Field

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Journal of Iron and Steel Research International 2014年第9期21卷 809-816页

作者： An-yuan DENG Lin XU En-gang WANG Ji-cheng HE Key Laboratory for Electromagnetic Processing of Materials of Ministry of Education Northeastern University

Utilizing ANSYS CFX commercial software and volume fraction of fluid （VOF） model, fluctuation behav- ior of steel/slag interface was numerically simulated in continuous casting mold with static magnetic field, and the influence of metal jet characteristics on the behavior of steel/slag interface was investigated. The results indicated that the behavior of steel/slag interface is similar at different process parameters, which is closely related to the characteristic of the flow field. The steel/slag interface has an obvious trough characteristic, which can be divided in- to three zones： frontal valley zone, back valley zone and horizontal zone~ as the magnetic flux density increases, the fluctuation of liquid level increases firstly and then decreases, and a reasonable magnetic flux density can make steel/ slag interface obtain a relatively flat interface, which can prevent slag from being entrapped into liquid steel. For a thin slab continuous casting process, when the casting speed is 4 m/min, a reasonable magnetic flux density is about 0.5 T, and the interfacial fluctuation is weaker. No matter the position of magnetic field is horizontal or vertical, for different operating parameters, there is a corresponding reasonable magnetic field position where the steel/slag inter- face fluctuation can be properly controlled and slag entrapment can be prevented.

关键词： continuous casting steel/slag interface static magnetic field metal jet slag entrapment

Modeling of Orientation and Alignment of Primary Al_3Ni Crystal in Al-Ni Alloy by Imposing a High Magnetic Field

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Journal of Iron and Steel Research International 2012年第S2期19卷 1095-1098页

作者： ZHANG Hong-wei JIANG Xing HE Ji-cheng Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern University

Regarding Al_3Ni crystal as a rigid ellipsoid,a model describing the orientation and alignment of a primary paramagnetic Al_3Ni crystal in Al- Ni alloy solidification under a high magnetic field is *** model is based on rigid body rotation dynamics model as well as the magnetic dipole model,*** describes the rotational motion of a magnetic anisotropic crystal around its centroid and around one endpoint of its crystal *** orientation time and the orientation characteristics with the intensity of magnetic field,the aspect ratio of the crystal and the effective viscosity of the melt,as well as the crystal growth,are deeply discussed for single ***,the interaction between two crystals during the alignment in high magnetic field are analyzed based on the magnetic dipole model,in which the final state of the grain is dependent on the attractive interaction force between two neighboring grains and the magnetization force acting on each *** prediction shows fitness with the experimental and theoretical results in literature.

关键词： high magnetic field magnetocrystalline anisotropy rotation magnetic interaction

A New Steel Teeming Technology by Using Electromagnetic Induction Heating System in Ladle

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Journal of Iron and Steel Research International 2012年第S2期19卷 766-770页

作者： LI De-jun WANG Qiang LIU Xing-an Gao Ao WANG Xue-bin DONG Jie KATSUKIYO Marukawa HE Ji-cheng Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern University Technology Center of Shandong Laiwu iron and steel Group

In order to overcome the pollution of the tratitional nozzle sand into the molten steel in tundish,a new method is proposed in this *** this method,the nozzle sand is substituted with iron-carbon alloy particles which have the same or similar compositions as the liquid *** casting processes,iron-carbon alloy forms solidification shell and the sintered layer in the upper nozzle to block the molten *** the slide gate is opened,the eletromagnetic induction heating is used to melt them so as to achieve 100%smoothly steel *** electromagnetic induction heating effects were analyzed theoretically in the new slide gate *** the new method has been experimentally tested by using self-designed experimental *** results show that the electromagnetic induction heating can complete the steel teeming within the required ***,this steel-teeming technology can further improve the cleanliness of liquid steel.

关键词： clean steel induction heating continuous casting electromagnetic metallury automatic casting ratio

Effect of Cr on Steel Solidification Structure Under EMS

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Journal of Iron and Steel Research International 2012年第S1期19卷 394-399页

作者： CHEN Jin SU Zhi-Jian Keiji Nakajima HE Ji-Cheng Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern University Division of Applied Process Metallurgy Department of Materials Science and Engineering Royal Institute of Technology(KTH)SE-10044 StockholmSweden

Solidification experiments of Cr steel under linear EMS were conducted to investigate the columnar-to-equiaxed transition(CET).The results are compared with those in carbon steel to clarify effect of Cr content and *** conclusions are as follow:The criterion for dendrite fragmentation under linear EMS is obtained and verified by previous paper,then is considered valid for Cr *** is carried out on the relation between the superficial velocity in the bulk flow and critical solid fraction at the time of dendrite fragmentation(CET occurrence).The critical solid fraction is smaller in high Cr *** a result,the CET occurrence is more difficult in this case.

关键词： Cr steel secondary arm spacing dendrite fragmentation CET solid fraction

Suppression of Effect of Uneven Velocity in Submerged Entry Nozzle in Round Billet Continuous Casting Process Using Electromagnetic Swirling Flow

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Journal of Iron and Steel Research International 2012年第S2期19卷 905-908页

作者： LI De-wei SU Zhi-jian MARUKAWA Katsukiyo HE Ji-cheng Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern University Formerly Sumitomo Metal Industries Ltd.

Sliding gate control system is widely employed in continuous casting process of steel to control flow rate of molten *** molten steel passes through a sliding gate,uneven flow *** will cause asymmetrical distribution of flow and temperature field in mold consequently,formation of vortex near the nozzle and entrapment of CC powder into the molten ***,which have negative effect on process productivity and product *** suppress the uneven flow,electromagnetic swirling flow has been proposed to impose on the flow in submerged entry nozzle below the sliding *** this study the uneven flow developed by incompletely open sliding gate and the suppression of this uneven flow using electromagnetic swirling flow are numerically studied in round billet continuous casting of steel *** improvement of the flow and temperature filed in the submerged entry nozzle and mold are *** is found that:The uneven velocity in nozzle can be suppressed by electromagnetic swirling flow,and the flow and temperature field in mold be improved obviously;With the increase of electromagnetic swirling intensity,the effect of uneven flow can be almost completely suppressed.

关键词： continuous casting process sliding gate,uneven flow,electromagnetic swirling flow round billet

Fundamental Study on Continuous Casting Process With Swirling Flow by Electromagnetic Force

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Journal of Iron and Steel Research International 2012年第S2期19卷 879-883页

作者： SU Zhi-jian LI De-wei CHEN-Jin MARUKAWA Katsukiyo HE Ji-cheng Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern University Formerly Sumitomo Metal Industries Ltd.

Swirling flow in a submerged entry nozzle is effective on improving quality of casting block and casting speed in continuous casting of steel.A new method for swirling flow generation in the nozzle has been proposed by the authors,that is a rotating electromagnetic field is set up around a submerged entry nozzle(SEN)to induce swirling flow in it by Lorentz *** this study,the magnetic field in molten steel in the submerged entry nozzle,the flow and temperature field in the SEN and mold in round,square billet and slab continuous casting process of steel are numerically *** model experiment of electromagnetic swirling continuous casting is also conducted with low melting point *** commercial test for slab is *** by numerical simulation and experiment show that the swirling flow by the optimum designed electromagnetic swirling generator can not only improve the distribution of flow and temperature in mold but also achieve the same effects generated by the swirling blade process. And,more effects on continuous casting process can be expected after this electromagnetic swirling process is optimized.

关键词： continuous casting process submerged entry nozzle swirling flow rotating magnetic field numerical simulation

Improvement of Inner Quality of High Carbon Wire Rod Steel Using Combined Electromagnetic Stirring

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Journal of Iron and Steel Research International 2012年第S2期19卷 945-948页

作者： XU Xiu-jie CHEN Feng DENG An-yuan ZHANG Xing-wu WANG En-gang He Ji-cheng Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern University Tianjin Rockcheck Steel Group Co. LTD

To improve the quality of high carbon wire rods,combined electromagnetic stirring was introduced in the continuous casting of round billets with a diameter of 250mm at Tianjin Rockcheck Steel Group *** this paper,the positioning of final electromagnetic stirring(F-EMS)was determined by nail-shooting ***,the effect of mold electromagnetic stirring(M-EMS)on the macrostructure and internal defects in the round billets was investigated to find out the optimal operating parameters for continuous casting of SWRH 82B round *** results show the desirable positioning of F-EMS locates 9.7m below the mold level where the molten steel can be effectively driven by electromagnetic force and disperse central composition *** shrinkage cavity is totally eliminated with the rotational *** ratio and index of central composition segregation and center porosity can be reduced significantly. Furthermore,the equiaxed crystal ratio is considerably increased to 64%under 480A/3Hz M-EMS and 500A/10Hz F-EMS. Fine microstructure and mechanical property of wire rod are presented after optimization of combined electromagnetic ***,the probability of occurrence of cup-cone fracture of wire rod is reduced dramatically.

关键词： continuous casting mold electromagnetic stirring wire rod steel macrostructure nonmetallic inclusion