| In recent years,in order to improve the quality of the magnesium alloy produced by semi continuous casting,electromagnetic stirring has been paid much attention as an efficient and non-contact improvement technology.Therefore,it is very significant to study the distribution of magnetic field in the mold and the effect on solute segregation about electromagnetic parameters during the electromagnetic stirring.Relying on the magnesium alloy electromagnetic casting project of Baosteel Institute,this paper studies on the electromagnetic stirring technology of magnesium alloy through the combination of numerical simulation and measured the distribution of magnetic flux density and actual casting experiment.Main tasks of this paper are as follows: on the one hand,a twodimensional mathematical model was established in present.It was used to calculate the radial direction magnetic flux density in the mold of magnesium alloy semi-continuous casting under electromagnetic stirring.The number and distribution characteristics of magnetic flux density under different mold thickness,number of electric current and current frequency were studied.Based on the calculation results,the evaluation method and index of radial direction magnetic field(the homogeneity coefficient of radial direction magnetic field ?)were proposed.The calculation method and physical significance of the coefficient were introduced.On the other hand,this paper studies on the effect on solute segregation about electromagnetic parameters by the methods of ICP-AES and the spectrum analysis.The index of solute segregation ?was proposed as the evaluation index of it and the optimization method of electromagnetic stirring parameters was suggested.It is hoped that the research results of this paper can provide the contribution for the development of electromagnetic casting technology on magnesium alloys in the future. |
PDF Full Text Request