A Numerical Study on the Influence of an Axial Magnetic Field (AMF) on Vacuum Arc Remelting (VAR) Process
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Date
2021-07-07
Authors
Karimi-Sibaki, Ebrahim
Kharicha, Abdellah
Abdi, Mehran
Vakhrushev, Alexander
Wu, Menghuai
Ludwig, Andreas
Boháček, Jan
ORCID
0000-0003-3319-4254Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
Springer
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Abstract
A comprehensive numerical model is proposed to study the influence of an axial magnetic field (AMF) on the solidification behavior of a Titanium-based (Ti–6Al–4V) vacuum arc remelting (VAR) ingot. Both static and time-varying AMF are examined. The proposed 2D axisymmetric swirl model includes calculating electromagnetic and thermal fields in the entire system composed of the electrode, vacuum plasma, ingot, and mold. A combination of vector potential formulation and induction equation is proposed to model the electromagnetic field accurately. Calculations of the flow in the melt pool and solidification of the ingot are also carried out. All governing equations are presented in cylindrical coordinate. The presence of a weak AMF, such as the earth magnetic field, can dramatically influence the flow pattern in the melt pool. The “Electro-vortex flow” is predicted ignoring AMF or in the presence of a time-varying AMF. However, the flow pattern is “Ekman pumping” in the presence of a static AMF. The amount of side-arcing has no influence on the pool depth in the presence of an AMF. Modeling results are validated against experiments.
Description
Citation
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE. 2021, vol. 52, issue 3, p. 1-9.
https://link.springer.com/article/10.1007%2Fs11663-021-02264-w
https://link.springer.com/article/10.1007%2Fs11663-021-02264-w
Document type
Peer-reviewed
Document version
Published version
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Language of document
en