Experimental and numerical investigations of arc plasma expansion in an industrial vacuum arc remelting (VAR) process

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F22%3APU146499" target="_blank" >RIV/00216305:26210/22:PU146499 - isvavai.cz</a>

Result on the web

<a href="https://www.nature.com/articles/s41598-022-24595-7" target="_blank" >https://www.nature.com/articles/s41598-022-24595-7</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41598-022-24595-7" target="_blank" >10.1038/s41598-022-24595-7</a>

Result language

angličtina

Original language name

Experimental and numerical investigations of arc plasma expansion in an industrial vacuum arc remelting (VAR) process

Original language description

In the present study, we investigate arc plasma expansion in an industrial vacuum arc remelting (VAR) process using experimental and numerical tools. Stainless steel is the alloy of interest for the electrode (cathode) and ingot (anode). During the operation of the VAR process, behaviors of cathode spots and plasma arc were captured using the high-speed camera (Phantom v2512). We found that spots prefer to onset and remain within the partially melted surface at the center of the electrode tip. Existing spots outside the melting zone accelerate toward the edge of the electrode to extinguish. We observed a fairly symmetrical and centric plasma column during the operation. For further investigation of the observed arc column in our experiment, we used the two-fuid magnetohydrodynamics (MHD) model of plasma proposed by Braginskii. Thus, we modeled the arc column as a mixture of two continuous interpenetrating compressible fuids involving ions and electrons. Through numerical simulations, we calculated plasma parameters such as number density of ions/electrons, electric current density, fow of ions/electrons, temperature of ions/electrons, and light intensity for the observed arc column in our experiment. The calculated light intensity of plasma was compared with images captured by the camera to verify the model. The distribution of electric current density along the surface of the anode, namely ingot, is a decisive parameter that impacts the quality of the fnal product (ingot) in VAR process. Herein, we confrm that the traditionally used Gaussian distribution of electric current density along the surface of the ingot is viable.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20303 - Thermodynamics

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Scientific Reports

ISSN

2045-2322

e-ISSN

—

Volume of the periodical

12

Issue of the periodical within the volume

1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

14

Pages from-to

1-14

UT code for WoS article

000889218700047

EID of the result in the Scopus database

2-s2.0-85142803616