Mathematical Model for Electroslag Remelting Process

Dong, Yanwu; Zheng-bang, LI

doi:10.1016/s1006-706x(08)60042-4

Cited by 23 publications

(16 citation statements)

References 4 publications

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“…Electroslag remelting (ESR) process was carried out using Al 2 O 3 -30% CaF 2 flux powder in order to obtain clean primary steel free from inclusions. The high solidification rate in ESR process could be also effective in minimizing the segregation degree of alloying elements [26]. Cast steel was homogenized at 1200°C for 4 h and hot rolled at 900-1000°C in several passes to reduce the thickness to about 15 mm.…”

Section: Methodsmentioning

confidence: 99%

Microstructural and mechanical properties of low-carbon ultra-fine bainitic steel produced by multi-step austempering process

Mousalou

Yazdani

Avishan

et al. 2018

Materials Science and Engineering: A

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Section: Methodsmentioning

confidence: 99%

Microstructural and mechanical properties of low-carbon ultra-fine bainitic steel produced by multi-step austempering process

Mousalou

Yazdani

Avishan

et al. 2018

Materials Science and Engineering: A

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“…These results are similar to previous simulation results. [5][6][7][8][9][35][36][37] C. Electrode Fusion Model…”

Section: A Validation Of the Mathematical Modelmentioning

confidence: 99%

“…The average droplet diameter should be obtained for calculating the process mentioned earlier. [5][6][7][8] However, we cannot attain the droplet information during ESR immediately. Kharicha et al [9][10][11] developed some models to study droplet behavior in the ESR process by using a multiphase flow method.…”

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confidence: 99%

Comprehensive Mathematical Model for Simulating Electroslag Remelting

Dong

Fan

Cao

et al. 2016

Metall Mater Trans B

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Droplet formation and departure from an electrode tip affect the temperature distribution in liquid slag and a molten steel pool, as well as the removal of nonmetallic inclusions in the electroslag remelting process. In this article, magneto-hydrodynamics modules coupled with a volume of fluid (VOF) model (as described in VOF model theory) for tracking phase distribution have been employed to develop the electrode fusion model and to investigate formation and departure of a droplet from the electrode tip. Subsequently, the remelting rate and molten steel pool have been achieved based on the electrode fusion model. Results indicate that a droplet can increase the flow rate of liquid slag, especially the region of droplet fall through the slag pool; yet it has little impact on the flow distribution. Asymmetric flow can take place in a slag pool due to the action of the droplet. The depth of the molten steel pool increases in the presence of droplets, but the width of the mushy zone decreases. In addition, the shape of the electrode tip is not constant but changes with its fusion. The remelting rate is calculated instead of being imposed in this work. The development of the model supports further understanding of the process and the ability to set the appropriate operating parameters, especially for expensive and easy segregation materials.

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“…The melting of the electrode is only related to the joule heat and electromagnetic force of the slag pool, and the temperature field in the slag pool is affected by the radiation and convection in the air, so the calculation field includes the air, electrode, and slag pool. In order to simplify the calculation, we put forward the following important assumptions [18]: (1) Due to the existence of self-inductance and mutual inductance, it is necessary to ignore the induced magnetic field in the system; (2) the fluid density does not change during the simulation, so the slag and molten steel can be considered as uncompressed Newtonian fluids; and (3) heat and mass transfer were studied in this paper, so the physical and chemical properties of the steel slag were only related to temperature.…”

Section: Mathematical Modelingmentioning

confidence: 99%

Droplet Formation and Dripping Behavior during the Electroslag Remelting Process with Two Series-Connected Electrodes

Tong

Zang

et al. 2020

Metals

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The formation and dripping behavior of droplets in the process of the electroslag remelting with two series-connected electrodes (TSCE-ESR) has an important influence on the optimization of power supply parameters and the purity of the electroslag ingot. In this article, through numerical simulation based on the VOF (volume of fluid) model, combined with the transparent experimental device for physical simulation, the mechanism of metal droplet formation and the effect of the filling rate on its droplet behavior were studied. The results showed that the proximity effect, instead of the skin effect, is a major factor influencing droplet formation in TSCE-ESR process. The proximity effect makes the region inside the two electrode tip melt first, and the molten steel converges at the electrode tips to form a droplet source. The process of droplet formation and dropping can be divided into three stages: formation of molten layer, droplet stretching and necking, and detachment. In the stage of droplet stretching and necking, the increase in the contact area between the droplet and the slag and the instantaneous increase of the current provide good thermodynamic and dynamic conditions for the removal of non-metallic inclusions. After the droplet drops into the slag pool, it promotes the flow of slag and improves the heat and mass transfer efficiency of the slag/metal interface. The relatively large filling rate can form smaller and dispersed droplets, which improves the refining effect. At the same time, the increase of the filling rate can improve the input power and the electrode remelting rate.

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Mathematical Model for Electroslag Remelting Process

Cited by 23 publications

References 4 publications

Microstructural and mechanical properties of low-carbon ultra-fine bainitic steel produced by multi-step austempering process

Microstructural and mechanical properties of low-carbon ultra-fine bainitic steel produced by multi-step austempering process

Comprehensive Mathematical Model for Simulating Electroslag Remelting

Droplet Formation and Dripping Behavior during the Electroslag Remelting Process with Two Series-Connected Electrodes

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