Publication detail

A Parametric Study of the Vacuum Arc Remelting (VAR) Process: Effects of Arc Radius, Side-Arcing, and Gas Cooling

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

Original Title

A Parametric Study of the Vacuum Arc Remelting (VAR) Process: Effects of Arc Radius, Side-Arcing, and Gas Cooling

Type

journal article in Web of Science

Language

English

Original Abstract

Main modeling challenges for vacuum arc remelting (VAR) are briefly highlighted concerning various involving phenomena during the process such as formation and movement of cathode spots on the surface of electrode, the vacuum plasma, side-arcing, the thermal radiation in the vacuum region, magnetohydrodynamics (MHD) in the molten pool, melting of the electrode, and solidification of the ingot. A numerical model is proposed to investigate the influence of several decisive parameters such as arc mode (diffusive or constricted), amount of side-arcing, and gas cooling of shrinkage gap at mold-ingot interface on the solidification behavior of a Titanium-based (Ti-6Al-4V) VAR ingot. The electromagnetic and thermal fields are solved in the entire system including the electrode, vacuum plasma, ingot, and mold. The flow field in the molten pool and the solidification pool profile are computed. The depth of molten pool decreases as the radius of arc increases. With the decreasing amount of side-arcing, the depth of the molten pool increases. Furthermore, gas cooling fairly improves the internal quality of ingot (shallow pool depth) without affecting hydrodynamics in the molten pool. Modeling results are validated against an experiment.

Keywords

numerical-simulation; electrode-gap; co pressure; thermophysical properties; temperature distribution; metal transfer; melt rate; behavior; solidification; alloy

Authors

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

Released

1. 2. 2020

Publisher

Springer Nature

Location

NEW YORK

ISBN

1073-5615

Periodical

METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE

Year of study

51

Number

1

State

United States of America

Pages from

222

Pages to

235

Pages count

14

URL

https://link.springer.com/article/10.1007/s11663-019-01719-5

Full text in the Digital Library

http://hdl.handle.net/11012/194825

BibTex

@article{BUT164737,
  author="Ebrahim {Karimi-Sibaki} and Abdellah {Kharicha} and Menghuai {Wu} and Andreas {Ludwig} and Jan {Boháček}",
  title="A Parametric Study of the Vacuum Arc Remelting (VAR) Process: Effects of Arc Radius, Side-Arcing, and Gas Cooling",
  journal="METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE",
  year="2020",
  volume="51",
  number="1",
  pages="222--235",
  doi="10.1007/s11663-019-01719-5",
  issn="1073-5615",
  url="https://link.springer.com/article/10.1007/s11663-019-01719-5"
}