Simulation Of Migration Behavior Of Nonmetallic Inclusions In Molten Metal Under Electromagnetic Field

With the development of modern science and technology,people have higher and higher requirements for the quality of steel,and the production of high-quality steel is inseparable from the removal of inclusions.In order to give full play to the metallurgical properties of tundish,now we will use electromagnetic induction heating technology to test the effect of purifying molten steel,in order to obtain the accumulation of nonmetallic inclusions in molten metal under the action of electromagnetic field.In this paper,physical and numerical simulation is used to study the induction heating tundish technology.The distribution of magnetic induction intensity in tundish channel is analyzed,and the influence of different factors on the experiment is discussed.The main conclusions are as follows.(1)When other conditions remain unchanged,the smaller the coil radius,the greater the magnetic induction intensity.If conditions permit,the induction coil with smaller inner diameter should be selected as far as possible.This is conducive to the adsorption of inclusions on the glass tube wall,which makes the phenomenon more obvious in the experimental process.(2)The smaller the coil radius,the more uniform the distribution of magnetic field,and the smaller change of the magnetic induction intensity curve inside the coil,which can make the inclusions uniformly adsorb on the channel wall,rather than limited to a certain section of the coil.(3)The adsorption rate of iron powder is 63.7% in normal temperature water at 12 A,while 80.4% in boiling water at 12 A.It can be seen that high temperature boiling water is obviously beneficial to the adsorption efficiency of iron powder without the influence of convection and thermophoresis.(4)When the mass of iron powder is 20 g,the adsorption capacity of coil is more obvious under low current condition.When the minimum current applied in the coil is12 A,the adsorption efficiency is only 56.25%.Moreover,the adsorption capacity of the coil to iron powder under different current conditions decreases greatly.Therefore,the adsorption capacity of the glass tube for iron powder has an upper limit.(5)When the current intensity is 18 A,the particle size of iron powder added into the glass tube is 5 ?m ? 500 ?m,and the adsorption rate of iron powder on the channel wall increases gradually,and the adsorption rate increases from 45.2% to 88.6%.It can be concluded that the larger the particle size of nonmetallic inclusions in liquid metal is,the easier it is to be absorbed by the channel in electromagnetic field.