Investigation of arc dynamics during vacuum arc remelting of a Ti64 alloy using a photodiode based instrumentation

Delzant, Pierre-Olivier; Chapelle, Pierre; Jardy, Alain; Jourdan, Julien; Millet, Y.

doi:10.1016/j.jmatprotec.2018.10.031

Cited by 11 publications

(4 citation statements)

References 8 publications

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“…Magnetic flux measurements revealed that the arc centroid was most of the time off-centered and rotated around the electrode centerline with a time period of approximately 20-40 s during VAR of Inconel 718 [7] and 1-20 s during VAR of a Ti64 alloy [8]. More recently, using an optical technique inspired from that proposed by Aikin and Williamson [9], we reported similar results during VAR of a Ti64 alloy showing the existence of an asymmetrical arc distribution with a periodic ensemble arc motion leading to various arc patterns [1].…”

Section: Introductionsupporting

confidence: 54%

“…Indeed, the experimental study of the characteristics of pattern B revealed that the stable regions associated with the stirring plateaus move slowly during the melt [1], which should tend to lessen the impact of the pattern asymmetry on the ingot. Such effects on the vanadium concentration remain true for all alloy elements with a partition coefficient different from 1.…”

Section: Discussionmentioning

confidence: 99%

“…A detailed description of the experimental work can be found in [1]. Here, we only give a brief summary of the main results needed for the understanding of the modelling work presented in the rest of the paper.…”

Section: Experimental Evidence Of the Existence Of A Time Varying Asy...mentioning

confidence: 99%

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Impact of a Transient and Asymmetrical Distribution of the Electric Arc on the Solidification Conditions of the Ingot in the VAR Process

Delzant

Chapelle

Jardy

et al. 2022

Metals

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Vacuum Arc Remelting is an important method of processing reactive and refractory liquid metal alloys, including titanium and zirconium alloys. Recent measurements of the electric arc dynamics under the presence of a time-varying magnetic field during an industrial melt of a Ti64 alloy provided evidence of the existence of an ensemble arc motion. Such motion is responsible for transient and non-axisymmetric inputs of electric current and energy at the top surface of the remelted ingot. The present work is an attempt to evaluate, using a simplified numerical simulation approach, to what extent the solidification conditions of the VAR ingot and, consequently, the quality of the final product, may be affected by this phenomenon. The reported results indicate that, under the worst case conditions, the relative vanadium segregation in the solidified ingot can reach values as high as 12.5%.

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Section: Introductionsupporting

confidence: 54%

Section: Discussionmentioning

confidence: 99%

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Impact of a Transient and Asymmetrical Distribution of the Electric Arc on the Solidification Conditions of the Ingot in the VAR Process

Delzant

Chapelle

Jardy

et al. 2022

Metals

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“…Based on magnetic field measurement around the VAR furnace, they reported three patterns for the arc, including diffusive, constricted eccentric, and rotating arcs. Delzant et al 13 placed photodiodes inside a VAR furnace of Ti64 alloy to evaluate arc movement based on the analysis of the light emitted by the arc. They reported three patterns, including a constricted centric arc, a back-and-forth motion of the arc centroid between two stable off-centred areas, and a back-and-forth motion of the arc following an elliptic path.…”

Section: Introductionmentioning

confidence: 99%

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

Karimi-Sibaki

Peyha

Vakhrushev

et al. 2022

Sci Rep

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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-fluid magnetohydrodynamics (MHD) model of plasma proposed by Braginskii. Thus, we modeled the arc column as a mixture of two continuous interpenetrating compressible fluids involving ions and electrons. Through numerical simulations, we calculated plasma parameters such as number density of ions/electrons, electric current density, flow 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 final product (ingot) in VAR process. Herein, we confirm that the traditionally used Gaussian distribution of electric current density along the surface of the ingot is viable.

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Advances in Magnetic Measurements and Externally Applied Magnetic Fields for Vacuum Arc Remelting Process Monitoring and Control

Cibula,

Motley,

Pettinger

et al. 2024

The Minerals, Metals &Amp; Materials Series

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Investigation of arc dynamics during vacuum arc remelting of a Ti64 alloy using a photodiode based instrumentation

Cited by 11 publications

References 8 publications

Impact of a Transient and Asymmetrical Distribution of the Electric Arc on the Solidification Conditions of the Ingot in the VAR Process

Impact of a Transient and Asymmetrical Distribution of the Electric Arc on the Solidification Conditions of the Ingot in the VAR Process

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

Advances in Magnetic Measurements and Externally Applied Magnetic Fields for Vacuum Arc Remelting Process Monitoring and Control

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