Publication detail

Arc distribution as a key driver of inclusion redistribution in Vacuum Arc Remelting (VAR)

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

English title

Arc distribution as a key driver of inclusion redistribution in Vacuum Arc Remelting (VAR)

Type

WoS Article

Language

en

Original abstract

A transient numerical model is developed to investigate inclusion transport and entrapment during full ingot growth in the Vacuum Arc Remelting (VAR) of the nickel-based superalloy GH4720Li. The model resolves the coupled electromagnetic field, melt-pool flow, solidification, and Lagrangian inclusion motion, enabling a quantitative assessment of arc behavior and inclusion entry conditions. Parametric studies show that increasing side arcing, whereby a portion of the electric current passes through the crown and along the lateral wall of the electrode toward the mold, produces a shallower melt-pool profile, weakens outward inclusion transport, and shifts inclusion entrapment away from the ingot sidewall toward the ingot interior. A constricted arc distribution, which produces a deeper and narrower melt pool, modifies the flow structure and enhances inward-directed transport, thereby reducing peripheral accumulation and promoting a more radially distributed inclusion pattern. Drip-short events, defined as the formation of molten metal bridges between the electrode and the ingot, introduce inclusions at greater depths, leading to a more distributed entrapment pattern throughout the melt pool. Model predictions are validated against experimental observations, providing quantitative guidance for improving ingot cleanliness.

Keywords in English

Vacuum Arc Remelting (VAR); transient ingot growth; Arc distribution; side arcing; Magnetohydrodynamics (MHD); Inclusions

Released

2026-05-02

Publisher

Elsevier BV

Journal

Journal of Materials Research and Technology-JMR&T

Volume

42

Number

7563-7584

Pages from–to

7563–7584

Pages count

22

BIBTEX


@article{BUT201983,
  author="{} and Mehran {Abdi} and  {} and Ebrahim {Karimi-Sibaki} and  {} and Menghuai {Wu} and  {} and Jan {Boháček} and  {} and Abdellah {Kharicha}",
  title="Arc distribution as a key driver of inclusion redistribution in Vacuum Arc Remelting (VAR)",
  journal="Journal of Materials Research and Technology-JMR&T",
  year="2026",
  volume="42",
  number="7563-7584",
  pages="7563--7584",
  doi="10.1016/j.jmrt.2026.04.262",
  issn="2238-7854",
  url="https://www.sciencedirect.com/science/article/pii/S2238785426010495?via%3Dihub"
}