Coupling of Multiple Numerical Models to Simulate Electroslag Remelting Process for Alloy 718

Giesselmann, Nils; Rückert, Antje; Eickhoff, Moritz; Pfeifer, Herbert; Tewes, Jürgen; Klöwer, J.

doi:10.2355/isijinternational.55.1408

Cited by 18 publications

(21 citation statements)

References 13 publications

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“…Glesselmann et al studied the movement of droplets and solidification process using coupled multi zone models, which were solved with different time steps. 22) Based on the mentioned above, two cases are implemented with different types of electromagnetic field. Case 1 considers the effect of metal droplets on electromagnetic field.…”

Section: Effects Of Metal Droplets On Electromagnetic Field Fluid Flmentioning

confidence: 99%

Effects of Metal Droplets on Electromagnetic Field, Fluid Flow and Temperature Field in Electroslag Remelting Process

Liu

Chen

et al. 2017

ISIJ Int.

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Section: Effects Of Metal Droplets On Electromagnetic Field Fluid Flmentioning

confidence: 99%

Effects of Metal Droplets on Electromagnetic Field, Fluid Flow and Temperature Field in Electroslag Remelting Process

Liu

Chen

et al. 2017

ISIJ Int.

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“…Over the past decades, different numerical models have been proposed to describe flow, thermal, magnetic fields, as well as solidification of ingots during the electroslag remelting (ESR) process . Modeling attempts were made for the chemical and electrochemical reactions in the slag by means of thermodynamics and a kinetic modeling approach .…”

Section: Introductionmentioning

confidence: 99%

Toward Modeling of Electrochemical Reactions during Electroslag Remelting (ESR) Process

Karimi-Sibaki

Kharicha

et al. 2017

steel research int.

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Electrochemical reactions always occur at the electrode–slag and slag–metal melt interfaces during the electroslag remelting (ESR) process. However, those reactions together with the ion transport phenomenon in the molten slag region are still poorly understood. A numerical model considering both the ion transport and the electrochemical reactions is demanding. For this purpose, a numerical model is proposed. The ion transport is modeled by solving the Poisson–Nernst–Planck (PNP) equations, while the kinetics of the reaction at the slag–metal interface is modeled with the well‐known “Butler–Volmer” formula. Demonstratively, a one‐ dimensional case is calculated: a DC electric current is applied to a molten multi‐ion slag (CaF2–FeO) between the anode and the cathode. The modeling results show that the redox reaction occurs only for the ferrous ion (Fe2+), not for other ions at low current density (<2 kA m−2), which was verified experimentally. We also find that formation of ferric iron (Fe3+) or discharge of calcium at large current density (>5 kA m−2) may not take place, although some researchers have proposed such a hypothesis. Therefore, further research steps are suggested to verify this point so that the model is fully applicable for the industrial ESR process.

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“…The electroslag remelting (ESR) process, which originates from 1950, is a particular refining technology for producing high performance ingots . Large‐scale ingots of high quality become more and more popular with the rapid progress of society . However, the traditional ESR process with only one electrode could not meet the requirements, especially when the diameter of ingot is too large .…”

Section: Introductionmentioning

confidence: 99%

A Sequence‐Coupled Mathematical Model of Magneto‐Hydrodynamic Two‐Phase Flow and Heat Transfer in a Triplex‐Electrode Electroslag Remelting Furnace

Wang

Liu

2019

steel research int.

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The triplex‐electrode electroslag remelting (TE‐ESR) furnace has the three‐phase equilibrium power supply which has the advantages of balanced load and reasonable short network structure, leading to a higher power factor. A transient three‐dimensional (3D) sequence‐coupled mathematical model is developed to explore the magneto‐hydrodynamic two‐phase flow and heat transfer in the TE‐ESR furnace. Compared to the traditional ESR process, the electromagnetic field, fluid flow, temperature, and solidification in the TE‐ESR system is completely different. Electric current has a tendency to gather beneath the top part of slag layer, with small amount entering the metal bath and the solidified ingot. The maximum Joule heating does not distribute beneath the interface of electrode and slag, but between adjacent electrodes. The thermal distribution in the TE‐ESR process is much more uniform than in the traditional ESR process, which is beneficial to improving ingot quality, especially heavy ingots. It can be observed that there is a pair of recirculation zones beneath the bottom of each electrode, caused by the formation and dripping of metal droplets. When the melting rate is increased to 0.03 kg s−1, the depth of the metal bath profile increases from 0.16 to 0.165 m.

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Coupling of Multiple Numerical Models to Simulate Electroslag Remelting Process for Alloy 718

Cited by 18 publications

References 13 publications

Effects of Metal Droplets on Electromagnetic Field, Fluid Flow and Temperature Field in Electroslag Remelting Process

Effects of Metal Droplets on Electromagnetic Field, Fluid Flow and Temperature Field in Electroslag Remelting Process

Toward Modeling of Electrochemical Reactions during Electroslag Remelting (ESR) Process

A Sequence‐Coupled Mathematical Model of Magneto‐Hydrodynamic Two‐Phase Flow and Heat Transfer in a Triplex‐Electrode Electroslag Remelting Furnace

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