Publication detail

Investigation of effect of electrode polarity on electrochemistry and magnetohydrodynamics using tertiary current distribution in electroslag remelting process

KARIMI-SIBAKI, E. KHARICHA, A. VAKHRUSHEV, D. WU, M. LUDWIG, A. BOHÁČEK, J.

English title

Investigation of effect of electrode polarity on electrochemistry and magnetohydrodynamics using tertiary current distribution in electroslag remelting process

Type

journal article in Web of Science

Language

en

Original abstract

Transport phenomena including the electromagnetic, concentration of ions, flow, and thermal fields in the electroslag remelting (ESR) process made of slag, electrode, air, mold, and melt pool are computed considering tertiary current distribution. Nernst-Planck equations are solved in the bulk of slag, and faradaic reactions are regarded at the metal-slag interface. Aiming at exploring electrochemical effects on the behavior of the ESR process, the calculated field structures are compared with those obtained using the classical ohmic approach, namely, primary current distribution whereby variations in concentrations of ions and faradaic reactions are ignored. Also, the influence of the earth magnetic field on magnetohydrodynamics in the melt pool and slag is considered. The impact of the polarity of electrode, whether positive, also known as direct current reverse polarity (DCRP), or negative, as known as direct current straight polarity (DCSP), on the transport of oxygen to the ingot of ESR is investigated. The obtained modeling results enabled us to explain the experimental observation of higher oxygen content in DCSP than that of DCRP operated ESR process.

English abstract

Transport phenomena including the electromagnetic, concentration of ions, flow, and thermal fields in the electroslag remelting (ESR) process made of slag, electrode, air, mold, and melt pool are computed considering tertiary current distribution. Nernst-Planck equations are solved in the bulk of slag, and faradaic reactions are regarded at the metal-slag interface. Aiming at exploring electrochemical effects on the behavior of the ESR process, the calculated field structures are compared with those obtained using the classical ohmic approach, namely, primary current distribution whereby variations in concentrations of ions and faradaic reactions are ignored. Also, the influence of the earth magnetic field on magnetohydrodynamics in the melt pool and slag is considered. The impact of the polarity of electrode, whether positive, also known as direct current reverse polarity (DCRP), or negative, as known as direct current straight polarity (DCSP), on the transport of oxygen to the ingot of ESR is investigated. The obtained modeling results enabled us to explain the experimental observation of higher oxygen content in DCSP than that of DCRP operated ESR process.

Keywords in English

Electroslag remelting; Electrochemistry; Calcium fluoride; Calcium oxide; Ion transport; Electro-migration

Released

06.12.2021

Publisher

Springer

Location

NEW YORK

ISSN

1006-706X

Volume

28

Number

12

Pages from–to

1551–1561

Pages count

11

BIBTEX


@article{BUT176904,
  author="Ebrahim {Karimi-Sibaki} and Abdellah {Kharicha} and Dmitrii {Vakhrushev} and Menghuai {Wu} and Andreas {Ludwig} and Jan {Boháček},
  title="Investigation of effect of electrode polarity on electrochemistry and magnetohydrodynamics using tertiary current distribution in electroslag remelting process",
  year="2021",
  volume="28",
  number="12",
  month="December",
  pages="1551--1561",
  publisher="Springer",
  address="NEW YORK",
  issn="1006-706X"
}