Mechanism Study of Steady Magnetic Field Effect on Spherical WC Particle Distribution during Laser Melt Injection

doi:10.3901/JME.2021.01.240

Abstract

Abstract: The viscous effect of steady magnetic field on metal fluid is used to prepare WC/316L composite coating with gradient distribution of particles on 316L stainless steel substrate. In order to study the mechanism of steady magnetic field effect on spherical WC particle distribution，laser melt injection (LMI) molten pool model was built with consider of solid-liquid phase change, Lorentz force and fluid flow. The influence of steady magnetic field on fluid flow field, Lorentz force distribution and equivalent viscosity is analyzed. Moreover, single particle dynamic model is used to study the effect of the steady magnetic field on the particle movement in the molten pool. Experimental and simulation results are confirmed that the tendency of WC particles concentrated on the surface of composite coating increases with the increase of the magnetic flux density from 0 T to 1.2 T. The results show that steady magnetic field can effectively increase the equivalent viscosity of molten pool fluid, which can enhance the particle fluid follow ability. Meanwhile, the Marangoni convection is suppressed by the steady magnetic field and the movement velocity of particle is further reduced. Therefore, the particles are difficult to move to the inside of molten pool and most of them are concentrated on the surface of the molten pool.

Key words: laser melt injection, steady magnetic field, molten pool, composite coating, multi-physical field

CLC Number:

TG156

HU Yong, WANG Liang, LOU Fuxing, XIA Hongchao, ZHANG Qunli, YAO Jianhua. Mechanism Study of Steady Magnetic Field Effect on Spherical WC Particle Distribution during Laser Melt Injection[J]. Journal of Mechanical Engineering, 2021, 57(1): 240-248.

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