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A transient fully coupled mathematical model using the magnetohydrodynamic multiphase method and based on a dynamic mesh-based approach has been developed to simulate the temperature field and molten pool shape in relation to the slag depth in an electromagnetically controlled vibrating-electrode electroslag-remelting furnace. The results show that changing the fill ratio significantly influences...
Transition-metal oxides are highly sought as alternative anode materials for rechargeable lithium-ion batteries (LIBs) owing to their high theoretical capacity. However, the large volume variation of active materials during cycling leads to poor cycle life, which hinders commercial applications. In this work, we prepared cobalt oxide/copper oxide/reduced graphene oxide (CoO/CuO/rGO) ternary nanocomposites...
To begin a preliminary exploration on the effect of shape, the effect of a novel shaped 29 × 6 mm plate mold on the microstructure and mechanical properties of directionally solidified (DS) Ti-45Al-2Cr-2Nb was investigated. For comparison, Φ15 mm cylindrical molds with an equivalent cross-sectional area were used. Experimental results show that the typical microstructures of the DS region in all samples...
The influence of the electrode immersion depth on the electromagnetic, flow and temperature fields, as well as the solidification progress in an electroslag remelting furnace have been studied by a transient three-dimensional coupled mathematical model. Maxwell’s equations were solved by the electrical potential approach. The Lorentz force and Joule heating were added into the momentum and energy...
The lithium ion (Li-ion) battery industry has been growing exponentially since its initial inception in the late 20th century. As battery materials evolve, the applications for Li-ion batteries have become even more diverse. To date, the main source of Li-ion battery use varies from consumer portable electronics to electric/hybrid electric vehicles. However, even with the continued rise of Li-ion...
The influence of the slag thickness on macrosegregation and transition zone (TZ) width of electroslag remelting (ESR) dual alloy ingot was investigated. To produce a dual alloy ingot, an electrode, constituted by a CrMoV bar and a NiCrMoV alloy bar, was remelted by using the ESR process. The slag thickness ranged from 50 mm to 70 mm. The results indicate that the slag temperature and melt rate first...
In order to explore the impact of anode replacement on heat transfer and magneto-hydrodynamic flow in aluminum smelting cells, a transient three-dimensional coupled mathematical model has been developed. With a steady state magnetic field, an electrical potential approach was used to obtain electromagnetic fields. Joule heating and Lorentz force, which were the source terms in the energy and momentum...
A transient three-dimensional (3D) coupled mathematical model has been developed to understand the effect of a vibrating electrode on the electromagnetic, two-phase flow and temperature fields as well as the solidification in the electroslag remelting (ESR) process. With the magnetohydrodynamic model, the Joule heating and Lorentz force, which are the source terms in the energy and momentum equations,...
A transient three-dimensional (3D) coupled mathematical model of electroslag remelting (ESR) furnace has been developed to investigate the impact of power control function on the heat transfer and magnetohydrodynamic (MHD) two-phase flow. Maxwell’s equations are solved by electrical potential method. The volume of fluid (VOF) approach is implemented to describe the two phase flow. The Lorentz force...
A transient, two-dimensional axisymmetric model was developed to understand the effect of the electromagnetic stirring (EMS) on the grain morphology of the electroslag remelting ingot. The cellular automaton-finite element technique was employed to describe the nucleation and growth of the grain. The Joule heating and Lorentz force created by the current of the furnace, as well as the Lorentz force...
A coupled cellular automaton–finite-element mathematical model has been developed to investigate the multiscale phenomena of the electroslag remelting (ESR) H13 steel ingot. The heat transfer equation is solved to obtain the temperature distribution and liquid metal pool profile by a coarser finite-element (FE) mesh. Then, a regular network of square cells with a much finer scale is drawn for the...
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