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Numerical simulation of nozzle structure to improve eccentric mold electromagnetic stirring in a round bloom mold
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作者 Jian-li Wang Yong-kun Yang +3 位作者 Jia-yu Zhu Wei-an Wang Liang Niu Xiao-ming Li 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2024年第9期2173-2185,共13页
A three-dimensional mathematical model coupling electromagnetic,flow,heat transfer,and solidification has been developed to investigate the effect of eccentric mold electromagnetic stirring(EM-EMS)on the flow and heat... A three-dimensional mathematical model coupling electromagnetic,flow,heat transfer,and solidification has been developed to investigate the effect of eccentric mold electromagnetic stirring(EM-EMS)on the flow and heat transfer of molten steel in round blooms with different cross sections.The uneven distribution of the flow field caused by EM-EMS was improved by changing the straight submerged entry nozzle(SEN)to a four-port SEN.The symmetry index was determined by the velocity distributions on the left and right sides of the center cross section of mold electromagnetic stirring(M-EMS),which quantitatively evaluated the symmetry of EM-EMS on the flow field.In the presence of EM-EMS,the maximum temperature difference ofϕ500 mm andϕ650 mm round blooms between the inner and outer curves amounted to 63 and 26 K,respectively.The maximum distinction between the solidified shells in the inner and outer curves was 11.5 and 5.3 mm,respectively.After using the four-port SEN,the temperature and the shell distribution on the inner and outer curves for theϕ500 mm round bloom were almost the same.The symmetry indices ofϕ500 mm andϕ650 mm round blooms were increased from 0.55 and 0.70 to 0.77 and 0.87,respectively.The four-port SEN can be used to mitigate the negative impact of EM-EMS on the steel flow field. 展开更多
关键词 Nozzle structure Eccentric mold electromagnetic stirring Symmetry index Flow behavior Round bloom
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Solidification Structure of Continuous Casting Large Round Billets under Mold Electromagnetic Stirring 被引量:6
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作者 Tao SUN Feng YUE +3 位作者 Hua-jie WU Chun GUO Ying LI Zhong-cun MA 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2016年第4期329-337,共9页
The solidification structure of a continuous casting large round billet was analyzed by a cellular-automaton-finite-element coupling model using the ProCAST software. The actual and simulated solidification structures... The solidification structure of a continuous casting large round billet was analyzed by a cellular-automaton-finite-element coupling model using the ProCAST software. The actual and simulated solidification structures were compared under mold electromagnetic stirring (MEMS) conditions (current of 300 A and frequency of 3 Hz). Thereafter, the solidification structures of the large round billet were investigated under different superheats, casting speeds, and secondary cooling intensities. Finally, the effect of the MEMS current on the solidification structures was obtained under fixed superheat, casting speed, secondary cooling intensity, and MEMS frequency. The model accurately simulated the actual solidification structures of any steel, regardless of its size and the parameters used in the continuous casting process. The ratio of the central equiaxed grain zone was found to increase with decreasing superheat, increasing casting speed, decreasing secondary cooling intensity, and increasing MEMS current. The grain size obviously decreased with decreasing superheat and increasing MEMS current but was less sensitive to the casting speed and secondary cooling intensity. 展开更多
关键词 continuous casting large round billet solidification structure cellular-automaton-finite-element method mold electromagnetic stirring central equiaxed grain zone grain size
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Effect of nozzle type on fluid flow, solidification, and solute transport in mold with mold electromagnetic stirring 被引量:6
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作者 Ya-dong Wang Li-feng Zhang +1 位作者 Wen Yang Ying Ren 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2022年第2期237-246,共10页
The mathematical model of coupling fluid flow,heat transfer,solidification,solute transport,and the electromagnetic field of the bloom in the upper part of the strand was established with three nozzle types.Then,the f... The mathematical model of coupling fluid flow,heat transfer,solidification,solute transport,and the electromagnetic field of the bloom in the upper part of the strand was established with three nozzle types.Then,the flow field,distribution of the temperature,solidification,and macrosegregation of carbon were investigated and compared by numerical modeling.In the case of the straight submerged entry nozzle(SEN),the molten steel flows down deep into the liquid pool,and the depth of the jet flow reaches about 1.0 m beneath the meniscus.The jetting zone is the high-temperature zone.In the case of two-port SEN and four-port SEN,the flow patterns and distribution of temperature in the central longitudinal section are similar.The jet flow impinges directly on the initially solidified shell and then it is divided into two longitudinal circulations.The heat of molten steel is dissipated along with the longitudinal circulations.The negative segregation band was generated near the bloom surface due to the washing effect by the rotating flow at the solidification front with three nozzle types.The negative segregation deteriorates gradually with the number of ports decreasing. 展开更多
关键词 Submerged entry nozzle Fluid flow SOLIDIFICATION Solute transport mold electromagnetic stirring
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Effect of mold electromagnetic stirring on solidification structure and solute segregation in continuous casting bloom 被引量:3
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作者 Dong-bin Jiang Li-feng Zhang Ya-dong Wang 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2022年第1期124-131,共8页
The effect of mold electromagnetic stirring(M-EMS)on the solidification structure and solute segregation in the continuous casting bloom of U78CrV steel is investigated.The solute distribution in the macroscale is ana... The effect of mold electromagnetic stirring(M-EMS)on the solidification structure and solute segregation in the continuous casting bloom of U78CrV steel is investigated.The solute distribution in the macroscale is analyzed using a carbon–sulfur analyzer and that in the microscale is measured with an electron probe microanalyzer.The Image-J software is applied to analyze the number density and area ratio of segregation spots.The results show that the segregation spots are mainly located in the columnar to equiaxed transition zone and the equiaxed zone,which are enriched with C,Cr,and Mn elements.With the M-EMS applied,the columnar grain inclines to the upstream side.As the current intensity increases,the deflecting angle of columnar grain rises,especially with the current intensity larger than 300 A.Besides,the center segregation shows a declining trend and the area fraction of the equiaxed zone rises clearly.Moreover,it is found that the area ratio and number density of segregation spots increase with the higher current intensity of M-EMS. 展开更多
关键词 Solidification structure MACROSEGREGATION Mesosegregation Segregation spot mold electromagnetic stirring
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Effect of electromagnetic stirring in mold on the macroscopic quality of high carbon steel billet 被引量:9
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作者 Haiqi YU Miaoyong ZHU 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2009年第6期461-467,共7页
An industrial plant trial for optimizing the process parameters in a round billet continuous casting mold with electromagnetic stirring (M-EMS) was performed, in which the influences of stirring parameters with M-EM... An industrial plant trial for optimizing the process parameters in a round billet continuous casting mold with electromagnetic stirring (M-EMS) was performed, in which the influences of stirring parameters with M-EMS on the solidification macrostructure of high carbon steel were investigated. The results show that the billet quality is not well controlled under the condition of working current and frequency with EMS, in which the subsurface crack of grade 1.0-2.0 ups to 38.09%, the central pipe of grade 1.0-1.5 reaches to 14.28%, and the central porosity of grade 1.5 is 14.29%. The parameters of current 260 A and frequency 8 Hz as the final optimum scheme has a remarkable effect for improving the macroscopic quality of billet, in which the subsurface crack, central pipe and skin blowhole are all disappeared, and the central porosity and carbon segregation are also well improved. 展开更多
关键词 Round billet continuous casting electromagnetic stirring in mold Macroscopic quality High carbon steel
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An Innovative Submerged Entry Nozzle Design for Billet and Bloom Casting
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作者 Gernot HACKL Yong TANG +3 位作者 Gerald NITZL Dennis SCHURMANN Bernd WILLERS Sven ECKERT 《China's Refractories》 CAS 2021年第2期45-50,共6页
Fluid flow in the mold has a significant impact on the quality of continuously cast steel products.Since it is strongly influenced by the SEN design,attention has to be paid on its geometry.In this paper the main prin... Fluid flow in the mold has a significant impact on the quality of continuously cast steel products.Since it is strongly influenced by the SEN design,attention has to be paid on its geometry.In this paper the main principles of a novel SEN type will be described.Water modeling and Computational Fluid Dynamics(CFD)are applied to characterize the flow pattern under different conditions.Furthermore,the interaction with electromagnetic stirring(M-EMS)is analyzed by means of a liquid melt model.Finally,actual steel plant performance data and observations are discussed. 展开更多
关键词 computational fluid dynamics liquid metal modeling mold electromagnetic stirring submerged entry nozzle isostatically pressed products
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