Numerical Simulation Of Electromagnetic Control Of Heterogeneous Particles In Metal Melt

Heterogeneous particles in the molten metal are directly related to the quality and performance of the metal material.In the smelting process,inclusion particles cannot be completely removed in molten metal.Small-diameter heterogeneous particles are difficult to be removed.According to the dispersion strengthening theory,it will play an enhanced role in the performance of metallic materials when the heterogeneous particles have appropriate diameter and uniform distribute in molten metal.Therefore,how to control the heterogeneous particles and disperse them uniformly in molten steel is the key to improve the metallic material properties.A method is proposed that using electromagnetic field control heterogeneous particles movement and distribution in molten steel.We use the ANSYS and FLUENT softwares to research this project,and solve the coupling problem of the magnetic field and the flow field with the electromagnetic stirring.The distribution of particles under different types of magnetic field was studied by the variance of the number of particles at per unit area.The effect of different parameters on particle distribution were investigated,such as the coil current intensity,the magnetic frequency,the electromagnetic stirring time,the molten statics time,particle densities,particle diameters and particle injection positions.The simulation results show that the electromagnetic stirring can promote the particles to disperse uniformly in the molten steel,and the Downward Traveling Magnetic Field(DTMF)is more conducive to the uniform distribution of the particles.Appropriate electromagnetic stirring intensity has a positive effect on the uniform distribution of particles.When electromagnetic stirring intensity is too large,it will generate a negative impact on the uniform dispersion of particles in molten steel.When the coil current is less than 175 A,the particles become nonuniform as the current intensity increases in the coil.When the current intensity exceeds 175 A,the uniformity of the particle distribution deteriorates.The uniformity of the particle distribution deteriorates with increasing magnetic field frequency.The variance of the number of particles at per unit area increases linearly with the increase of alternating current frequency.The particle distribution in the molten steel gradually becomes better with appropriate extension of the electromagnetic stirring time.Then the distribution of particles in the molten steel will reach a relatively steady state.The uniformity of the particle distribution becomes better as the molten steel settles for an extended period of time.When the particle size is less than 1?m,the change of the particle size has little effect on the particle distribution in the molten steel.When the particle size is larger than 1?m,the particle distribution sharply became nonuniform as the particle size becomes larger,and segregation occurs in molten steel.The particle density has little effect on the particle distribution.When the molten steel is affected by DTMF,it will make the particles distribute more uniformly if the particles are injected from the top of crucible.