Solidification of low-silicon iron under the action of nanosecond electromagnetic pulses

Ri, E. H.; Ri, Hosen; Ermakov, M. A.; Knyazev, G. A.; Dzhou, Bao Lao; Ri, Vladislav

doi:10.3103/s0967091213080111

Cited by 7 publications

(3 citation statements)

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“…Ri et al [ 48 ] consider low silicon cast iron containing 3.7% C, 1.0% Si, 0.5% Mn, 0.1% P, and 0.1% S. Hot metal was irradiated at 1350 °C by electromagnetic pulses for 5, 10, 15, and 20 min. Generator of EMP had the next characteristics: positive pulses; pulse amplitude 6000 V with a 50 Ω load; pulse length 0.5 ns at half height; maximum permissible pulse repetition frequency 1 kHz; delay of the output pulse relative to the front of the triggering pulses 120 ns; and maximum current consumed by the generator over the whole supply voltage range no more than 1.7 A at a frequency of 61 kHz.…”

Section: Results Of the Practical Use Of Pulsed Processing Of Metal M...mentioning

confidence: 99%

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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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Section: Results Of the Practical Use Of Pulsed Processing Of Metal M...mentioning

confidence: 99%

“… Influence of the irradiation time (τirr, sec) by electromagnetic pulses on the metal properties [ 48 ]: ( a ) the temperature of crystallization, the beginning and end of the eutectic transformation; ( b ) the beginning and end of the eutectoid transformation; ( c ) hardness and density. …”

Section: Figurementioning

confidence: 99%

Theory and Practice of Using Pulsed Electromagnetic Processing of Metal Melts

2022

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“…Как показывают накопленные к настоящему времени данные лабораторных и промышленных экспериментов, эффективным способом целенаправленного воздействия на структуру и свойства литейных сплавов является обработка расплавов наносекундными электромагнитными импульсами (НЭМИ) [26][27][28]. Высокая мощность (от 1,5 до 7,0 МВт) и малая длительность импульсов (от 0,1 до 1,0 нс) приводят к возникновению импульсных электромагнитных полей с напряженностью до 10 11 -10 12 В/м [29], при этом большая часть энергии импульса поглощается расплавом металла.…”

Section: Modification Of Al-mg-si Casting Aluminum Alloys By Liquid P...unclassified

Modification of Al–Mg–Si casting aluminum alloys by liquid phase processing with nanosecond electromagnetic pulses

Деев¹,

Ri²,

Прусов³

et al. 2021

Izv.VUZ. Tsvet. Met.

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The AA 511 alloy of the Al–Mg–Si system was used as an example to demonstrate that aluminum melt irradiation with nanosecond electromagnetic pulses (NEPs) leads to a significant change in the nature of structure formation during crystallization. It was found that an increase in the frequency of melt irradiation with NEPs is accompanied by the refinement of the alloy structural components, while the greatest grain size reduction of the α-solid solution and intergranular inclusions of the eutectic Mg2Si phase is observed at a NEPs frequency f = 1000 Hz. An increase in the NEPs frequency leads to a significant increase in the concentration of magnesium in the α-solid solution and the fragmentation of Mg2Si phase intergranular inclusions, which is released in the form of compact isolated inclusions when the melt is irradiated at a frequency of 1000 Hz. It was shown that melt processing with NEPs leads to an increase in the Brinell hardness of as-cast specimens, as well as to a significant increase in the microhardness of α-solid solution grains (from 38.21 HV in the initial state to 61.85 HV after irradiation with a frequency of 1000 Hz). It was assumed that the effect of a pulsed electromagnetic field leads to a decrease in the critical values of the Gibbs free energy required to initiate nucleation processes, and to a decrease in the surface tension at the «growing crystal – molten metal» interface, which causes a modifying effect on the alloy structure due to a decrease in the critical size of crystal nuclei.

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Structure formation of cast Al-Mg-Si alloys during the melts irradiation with nanosecond electromagnetic pulses

Деев

Прусов

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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An assessment of the grain refining effect of nanosecond electromagnetic pulses on the structure of cast aluminum alloys of the Al-Mg-Si system is carried out. The relationship between the amplitude of nanosecond electromagnetic pulses (5, 10, 15 kV) and the structural and morphological parameters of the irradiated aluminum alloys is shown. It was found that the processing of the melts at an amplitude of 15 kV is accompanied by the greatest refinement of the structural components of the alloy, and also by a change in their morphology and a decrease in microporosity in the structure of cast ingot. Theoretical analysis of the influence of nanosecond electromagnetic pulses on the structure and properties of aluminum alloys from the standpoint of the theory of the microheterogeneous structure of metal melts is given.

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Solidification of low-silicon iron under the action of nanosecond electromagnetic pulses

Cited by 7 publications

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Theory and Practice of Using Pulsed Electromagnetic Processing of Metal Melts

Theory and Practice of Using Pulsed Electromagnetic Processing of Metal Melts

Modification of Al–Mg–Si casting aluminum alloys by liquid phase processing with nanosecond electromagnetic pulses

Structure formation of cast Al-Mg-Si alloys during the melts irradiation with nanosecond electromagnetic pulses

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