Current, Magnetic Field and Joule Heating in Electroslag Remelting Processes

Li, Baokuan; Fang, Wang; Tsukihashi, Fumitaka

doi:10.2355/isijinternational.52.1289

Cited by 56 publications

(30 citation statements)

References 6 publications

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“…7,8) ESR process is caused by means of an alternating current (AC) or a direct current (DC) which flows through the highresistivity slag pool from the electrode to the ingot, thus generating Joule heating in the electrode and slag. The Joule heating at the electrode periphery is significantly greater than that in the center, owing to the higher current density concentrated at the electrode periphery induced by the skin effect; 9,10) in addition, the maximum of Joule heating is at the electrode/slag interface region around the electrode tip, which provides the necessary energy to melt consumable electrode. During the ESR process, the consumable electrode tip immersed in slag with a high temperature will melt, and then thin liquid metal films come into being when the thermal energy supplied by Joule heating accumulated to a certain degree.…”

Section: Introductionmentioning

confidence: 99%

Effect of Operating Conditions on Inclusion of Die Steel during Electroslag Remelting

Wang

2018

ISIJ Int.

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The current paper focuses on the effect of different operating conditions on the content of inclusions and cleanliness of remelting ingots. For these investigations, eight ingots were remelted with two slag amount and with two current intensity under otherwise comparable remelting conditions. A twodimensional (2D) coupled mathematical model was employed to simulate the velocity field, solidification and inclusion motion for a system of electrode, slag and ingot in electroslag remelting (ESR) processes, to reveal the inclusion removal mechanism. The results showed that the content of large-sized inclusions in ESR ingot was decreased by approximately 66.18% when the slag amount was increased from 17.85 kg to 20.50 kg. Because of the increase of slag amount, the metal and slag flow faster and the maximal velocity increases by 10.3%, thus there is an increasing trend in trajectories of inclusions (i.e., inclusion motion) in slag pool resulted from the stronger natural convective flow, which is beneficial for the inclusion removal. When the average current was increased from 4 kA to 5 kA, the content of large-sized inclusions in ESR ingot was decreased by approximately 51.38%. Because of the increasing of current, the flow in the middle of the slag pool becomes stronger and the maximal downward velocity increases by 2.7%, thus there is an increasing trend in the renewal rate of the metal film surface due to the stronger washing by slag flow, which can promote the inclusion removal.

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Section: Introductionmentioning

confidence: 99%

Effect of Operating Conditions on Inclusion of Die Steel during Electroslag Remelting

Wang

2018

ISIJ Int.

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“…The electrodes is heated by the Joule heating and melted in the form of droplets. [4][5][6] They travel through the less dense slag layer to the bottom of water-cooled mould where they solidify directionally. The ingot quality is dependent on the coupled interaction of electromagnetic field, flow field and temperature field.…”

Section: Introductionmentioning

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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“…Li et al employed a 3D finite element model to understand the effects of the current frequency, electrode immersion depth and slag thickness on the current density and Joule heating distributions. 11) They found that the maximum Joule heating density reduces by 53.2% while the slag thickness increases from 0.15 m to 0.23 m. The velocity field and temperature distribution however were not demonstrated in their work. Wang et al established a transient 3D model to investigate the effect of the current on the metal pool profile.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on the Effect of Slag Thickness on Metal Pool Profile in Electroslag Remelting Process

Wang

2016

ISIJ International

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A transient three-dimensional (3D) model was developed to understand the role slag thickness plays in the formation of the metal pool in the electroslag remelting (ESR) process. In this model, the solution of the mass, momentum and energy conservation equations were simultaneously implemented by the finite volume method with full coupling of the Joule heating and Lorentz force by solving the Maxwell's equations. The movement of metal droplet was described by volume of fluid (VOF) approach. Additionally, the solidification was modeled using an enthalpy-based technique, where the mushy zone was treated as a porous medium. The experiment and simulation demonstrated a reasonable agreement. The results indicate that changing the slag thickness changes the slag temperature, but not monotonically. The slag temperature drops with the slag thickness up to 60 mm, beyond which the slag temperature rises. The melt rate decreases and then increases while the cooling intensity remains unchanged. As a consequence, the maximal metal pool depth reduces from 0.081 m to 0.067 m and slightly increases to 0.074 m.

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Current, Magnetic Field and Joule Heating in Electroslag Remelting Processes

Cited by 56 publications

References 6 publications

Effect of Operating Conditions on Inclusion of Die Steel during Electroslag Remelting

Effect of Operating Conditions on Inclusion of Die Steel during Electroslag Remelting

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

Numerical Investigation on the Effect of Slag Thickness on Metal Pool Profile in Electroslag Remelting Process

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