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Effect of vertical electromagnetic stirring on solute distribution in billet continuous casting process

Journal of Iron and Steel Research(International) 2022年第1期29卷 132-143页

作者： Tao Wang En-gang Wang Yves Delannoy Yves Fautrelle olga budenkova Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang 110004LiaoningChina CNRS Grenoble INPSIMAPUniversité Grenoble AlpesGrenoble 38000France School of Metallurgy Northeastern UniversityShenyang 110004LiaoningChina CNRS Grenoble INPLEGIUniversité Grenoble AlpesGrenoble 38000France

A volume averaged columnar solidification model,which couples the flow,temperature and solute concentration fields,is applied to simulate experimental continuous casting cases with and without vertical electromagnetic stirring(V-EMS).The calculated distribution of magnetic induction intensity and final macrosegregation maps are consistent with the experimental *** results reveal that the V-EMS promotes longitudinal melt flow,accelerates heat dissipation and solidification and finally reduces the central segregation of ***,when V-EMS is applied,the solute distribution becomes asymmetric because the melt flow shows opposite directions between the near and far sides from *** obvious positive segregation band is observed at about 1/4 width of the billet near the stirrer in both calculated and experimental *** position and degree of such positive segregation could be affected by installation height of stirrer,as demonstrated by additional simulation cases.

关键词： Vertical electromagnetic stirring Macrosegregation Volume averaged method Continuous casting

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Thermo-Electric Motions and Structures Generated by Static Magnetic Fields During the Solidification of Metallic Alloys

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Journal of Iron and Steel Research(International) 2012年第S1期19卷 9-17页

作者： LI Xi REN Zhong-ming Gagnoud Annie budenkova olga Bojarevics Andris Fautrelle Yves Department of Materials Engineering Shanghai University SIMAP-EPM-Madylam/CNRS Grenoble Institute of TechnologyBP 7538402 St Martin d'Heres CedexFrance Institute of Physics University of LatviaMiera Street 32Salaspils LV-2169Latvia

Thermo-electric currents in the presence of static magnetic fields generate significant electromagnetic forces(TEM forces).The thermo-electric currents are due to the Seebeck effect when temperature gradients exist in the material. Those forces may produce various phenomena like pumping,stirring in liquid metals as well as solid motions,stresses in the solid *** effects may be encountered especially during the solidification of metallic materials because of the existence of significant temperature *** liquid metals the application of a static magnetic field enhances TEM convection at moderate intensity but also damps it when it is strong *** means that there exists a maximum of the convection which occurs when the Hartmann layers are comparable to the considered length ***,the smaller the length scales are(for example when primary or secondary dendrite arm spacings are considered),the higher the magnetic field strength which is needed to damp the TEM *** far,many solidification experiments on various types of alloys(e.g.,Sn-Pb,Al-Cu,Al-Si,Al-Ni etc.)have been carried *** experiments have shown that TEM convection occurs both in the liquid bulk but also in the deep mushy *** convection may strongly influence the meso-macrosegregation patterns,the solidification structures and the grain boundaries leading to the striking grain boundary structure of the mushy *** flow pattern and accordingly the segregations may be controlled by changing the orientation of the applied magnetic field,i.e.,axial or *** have shown that very high magnetic field strengths,up to 16 T,are needed to damp the TEM *** numerical and analytical investigations show that the TEM force density is very important in the liquid,but can be even more important in the ***,for high Hartmann number,the electric currents are confined in a small skin layer near the solid boundaries leading to a decay of the ***

关键词： high magnetic field thermo-electric magnetic convection mesosegregations dendrite fragmentation

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Impact of the Travelling Magnetic Field on the Metallic Impurities During the Crystallization of Photovoltaic Silicon

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Journal of Iron and Steel Research(International) 2012年第S1期19卷 243-247页

作者： Kader Zaidat Mircea Cablea Abdallah Nouri Ghatfan Hassan Bachir Saadi olga.budenkova Annie.Gagnoud Yves.Delannoy SIMAP EPM-CNRS 1340 rue de la piscineF-38402Saint Martin d'Heres CedexFrance Silicor Materials Inc. VaughanOntarioCanada

Silicon is the most extensively studied semiconductor mainly owing to its wide applicability in the photovoltaic solar cell *** the qualily of Si photovoltaic cells depends on the purity of the material and on the grain structure of the ingot from which the wafers are *** electrical performance of such materials,i.e. mainly their minority carrier lifetime,is closely related to metal impurities present in the feedstock or introduced during crystal *** impurities strongly interact with existing crystal defects to form complexes,accumulate at dislocations or grain boundaries in different forms,or even form silieide precipitates,which simultaneously contain several metal *** such a context,it is necessary to control the segregation of impurities especially metallic in the grown ingot in order to optimize the cell properties as a function of the raw material purity.A new Bridgman set-up is developed in order to study the crystallization of photovoltaic Si under independently controlled solidification parameters growth rate,thermal gradient,purity and ***,either natural or forced,plays a very important role during the *** intensity and flow pattern affect heat and mass transfer and,consequently,macrostructure and segregation in a solidified *** the convection can be controlled by a travelling magnetic field in order to homogenize or segregate the rejected impurities such as metallic *** effects of the magnetic field intensity and frequency on the segregation and crystalline structure will be presented.

关键词： Silicon magnetic field macrostructure crystallization

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