Study On The Electromagnetic Field Distribution Under Electric Pluse On Metal Melt

Since the phenomenon of electromigration was discovered in1861in metallicmaterials,the effects of electric current on solidification of the melt have been paid attention. Amongthem, the existing state and the distribution of electromagnetic field in the melt under the highdensity electric pulsed has aroused great interest for researchers.The numerical simulation methods on the electromagnetic field distribution inside themelt under electrical pulses were systematically analyzed in this paper by using the finiteelement method (FEM). SOLID231of ANSYS software was selected as electric fieldsimulation analysis unit, SOLID117was selected as magnetic field analysis unit. The freemeshing method FEM, with three level of mesh density, was confirmed by the comparisonbetween the hexahedral meshing method and free meshing method. The electromagnetic fielddistribution rules in the saline solution and mercury were studied by using the modelestablished and the simulated results were verified by quadrupole method. The simulationresults was well consistent with the measured results, verified the feasibility of numericalsimulation.By establishing the simulation model of electromagnetic field distribution in Al-5%Cumelt under electrical pulses, the electric field distribution in melt were simulated under threeconditions (such as, the pool size, electrode diameter and electrode array design). The resultsshowed that, when the electrode diameter was determined, the variation of the pool size canlead to skin effect and nonuniform electric potential distribution between two electrodes andmelt surfaces; when the electric the pool size is200mm, when the radius of electrode is14mm,the electric distribution was uniform; when the two groups of electrode were selected, whenthe electrode distance was10cm, the electric potential distributed widely but nonuniformly,and the electric potential concentrated zone was formed; when the electrode distance was5cm,the electric potential distribution region was small, the electric potential was uniform andwasn’t formed the large electric potential difference zones. When the groups of electrodeswas more, the electric potential difference was small, and the electric potential was uniform;when the groups of electrodes was less, the electric potential difference was large, and theelectric potential was nonuniform. The magnetic intensity would increase with the distanceincrease to the melt pool bottom; when the distance to the melt pool bottom was0.24m, themagnetic intensity became the maximum, and then the magnetic intensity would decreasewith increase of distance.