Contactless generation of ultrasonic vibrations in molten metals

Arkin, M; Goncharova, I.F.; Mirotvorskii, V. S.

doi:10.1016/0041-624x(69)90546-0

Cited by 5 publications

(9 citation statements)

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“…Substituting the obtained value of the pulse power in Equation 1, we obtained Р pulse = 1.3 × 10 5 Pa (or 1.3 atm). This value is close in magnitude to the values of pressure used in [24,30].…”

Section: Converting Electromagnetic Pulses To Acoustic Pulsessupporting

confidence: 75%

“…Previous research [21][22][23][24] has shown that ultrasonic vibrations occur in metal melts when exposed to electromagnetic waves. In [24], possible schemes for the electrodynamic induction excitation of vibrations in liquid metals were classified, and the ultrasound intensity in the metal was estimated, which can be obtained with parameters close to real parameters. The contactless excitation scheme of elastic vibrations in a melt using a constant magnetic field and alternating current was considered in detail.…”

Section: Converting Electromagnetic Pulses To Acoustic Pulsesmentioning

confidence: 99%

“…In [24], it was noted that in order to create positive metallurgical effects, the electrodynamic pressure in the melt should be 1-4 atm or 1-4 × 10 5 Pa.…”

Section: Converting Electromagnetic Pulses To Acoustic Pulsesmentioning

confidence: 99%

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Analysis of the Results of Pulsed Processing of Melts

Krymsky

Shaburova

Litvinova

2020

Metals

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The paper presents the results of a relatively new method of external action on melts developed by the authors. The essence of the technology is the impact on melts before casting with electromagnetic pulses (EMP) of short duration (1 ns) and with high pulse power (2 kW). To create electromagnetic pulses, a generator with the following characteristics was used: pulse amplitude of 10 kV, the leading edge of the pulse was 0.1 ns, pulse duration of 1 ns, pulse repetition rate at 1 kHz, and a calculated pulse power of 2 MW. A distinctive feature of the generator used was its low power consumption of 50 Watts. The results of processing low-melting melts of the Al–50Pb, Bi–38Pb, and Bi–18Sn–32Pb systems presented in the work indicated that EMP treatment led to the occurrence of equilibrium crystallization of the metal, increasing its density. In addition to the experimental results, a theory is provided to explain the mechanism of the influence of pulse processing on the properties of metals of these and other systems previously studied by the authors.

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Section: Converting Electromagnetic Pulses To Acoustic Pulsessupporting

confidence: 75%

Section: Converting Electromagnetic Pulses To Acoustic Pulsesmentioning

confidence: 99%

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Analysis of the Results of Pulsed Processing of Melts

Krymsky

Shaburova

Litvinova

2020

Metals

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“…Ultrasonic waves may effectively modify the microstructure of the samples during melting and solidification. As reported by Arkin et al [34], in order to create obvious positive effects on nucleation when ultrasonic waves flow through a metal melt, the electrodynamic pressure in the melt should be in the range of 1 × 10 5 to 4 × 10 5 Pa. The EMP-induced pressure in the melt can be calculated by the formula:…”

Section: Microstructurementioning

confidence: 99%

Effect of Electromagnetic Pulses on the Microstructure and Abrasive Gas Wear Resistance of Al0.25CoCrFeNiV High Entropy Alloy

et al. 2022

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High entropy alloys (HEAs) are among the most promising materials, owing to their vast chemical composition window and unique properties. Segregation is a well-known phenomenon during the solidification of HEAs, which negatively affects their properties. The electromagnetic pulse (EMP) is a new technique for the processing of a metal melt that can hinder segregation during solidification. In this study, the effect of an EMP on the microstructure and surface properties of Al0.25CoCrFeNiV HEA is studied. An EMP, with an amplitude of 10 kV, a leading edge of 0.1 ns, a pulse duration of 1 ns, a frequency of 1 kHz, and pulse power of 4.5 MW, was employed for melt treatment. It was found that the microstructure of Al0.25CoCrFeNiV HEA changes significantly from dendritic, for an untreated sample, to lamellar “pearlite-like”, for an EMP treated sample. Moreover, EMPs triggered the formation of a needle-like σ-phase within the solid solution grains. Finally, these microstructural and compositional changes significantly increased the microhardness of Al0.25CoCrFeNiV HEA, from 343 ± 10 HV0.3 (without the EMP) to 553 ± 15 HV0.3 (after the EMP), and improved its resistance against gas-abrasive wear. Finally, an EMP is introduced as an effective route to modify the microstructure and phase formation of cast HEAs, which, in turn, opens up broad horizons for fabricating cast samples with tailorable microstructures and improved properties.

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“…Mechanical vibrations are excited not only in metal samples [ 80 ], but also in liquid melts. In [ 81 ], schemes of electrodynamic induction excitation of oscillations in liquid metals are presented and the intensity of ultrasonic oscillations arising in a metal with parameters close to experimental ones is estimated. The non-contact excitation of elastic vibrations in a melt using a constant magnetic field and alternating current is considered in detail.…”

Section: Mechanisms Of the Impact Of Pulse Treatment On Metal Meltsmentioning

confidence: 99%

Theory and Practice of Using Pulsed Electromagnetic Processing of Metal Melts

2022

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In industrial practice, various methods of external influences on metal melts are used. For example, vibration processing, exposure to ultrasound, and other physical fields. The main purpose of such influences is purposeful grinding of the metal structure, which contributes to the improvement of mechanical characteristics. The article presents an overview of research on pulse processing of ferrous and non-ferrous melts: processing with pulsed current, electromagnetic pulses and pulsed magnetic fields. The results of the analysis showed that, despite the different methods and devices used for these treatments, their effect on the structure and properties of the cast metal is generally the same. The main effect is observed in the refinement of the macro and microstructure and a simultaneous increase in the strength properties and plasticity. The intensity of the observed effects depends on the characteristics of the equipment used to create the pulses. The main characteristics are: pulse duration, pulse frequency, current amplitude, and power.

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Contactless generation of ultrasonic vibrations in molten metals

Cited by 5 publications

References 0 publications

Analysis of the Results of Pulsed Processing of Melts

Analysis of the Results of Pulsed Processing of Melts

Effect of Electromagnetic Pulses on the Microstructure and Abrasive Gas Wear Resistance of Al0.25CoCrFeNiV High Entropy Alloy

Theory and Practice of Using Pulsed Electromagnetic Processing of Metal Melts

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