Modelling Liquid Steel Motion Caused by Electromagnetic Stirring in Continuous Casting Steel Process

Rywotycki, M.; Malinowski, Z.; Giełżecki, Jan; Gołdasz, A.

doi:10.2478/amm-2014-0080

Cited by 15 publications

(6 citation statements)

References 6 publications

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“…The copper plate of the mold has a certain conductivity and certain magnetic shielding properties. When the electromagnetic force reaches the maximum value, the permeability magnetic flux density inside the round bloom decreases with the increase of the current frequency, and the magnetic flux density and electromagnetic force in the molten steel decrease [12,13]. Therefore, the current frequency of M-EMS is mainly from 1 to 10 Hz.…”

Section: The Effect Of Current Frequency On the Magnetic Fieldmentioning

confidence: 98%

The Simulation and Optimization of an Electromagnetic Field in a Vertical Continuous Casting Mold for a Large Bloom

Zhang

et al. 2020

Metals

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The electromagnetic model of a large-bloom continuous casting was established to simulate the magnetic field. The model 3600 digital, high-precision, three-dimensional Gaussian meter was used to measure the internal magnetic field of mold electromagnetic stirring (M-EMS). The distribution of simulated magnetic field was basically consistent with that of the measured magnetic field; the accuracy of electromagnetic stirring model was verified. With the increase of current frequency, the electromagnetic force first increases and then decreases; when the current frequency is 9 Hz, the electromagnetic force reaches its maximum value. A bipolar electromagnetic stirring model is proposed; the influence of current intensity and distance were investigated. With the increase of current intensity of lower mold electromagnetic stirring (M-EMSB), the internal magnetic intensity of upper mold electromagnetic stirring (M-EMSA) gradually increases, and the middle region is gradually filled by magnetic field. With the increase of the distance, the range of the low-intensity magnetic field expands. When the current intensity of the M-EMSB is 320 A, and the distance is 400 mm, an 8 mT uniform magnetic field in the range of 1.2 m is formed. Compared with the traditional continuous casting electromagnetic agitator, the center equiaxial crystal of bipolar electromagnetic agitator increases from 30.3% to 49.5%.

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Section: The Effect Of Current Frequency On the Magnetic Fieldmentioning

confidence: 98%

The Simulation and Optimization of an Electromagnetic Field in a Vertical Continuous Casting Mold for a Large Bloom

Zhang

et al. 2020

Metals

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“…The product of each droplet volume (V d ) and the liquid metal density (ρ) gives the mass of each droplet (m d = ρ.V d ). The density value was adopted as being 7040 kg/m 3 , by considering common steel in the liquid state [22]. Figure 6 presents the mean values of both the volume and mass of the droplets for each condition.…”

Section: Effect Of Wire Feed Pulsation On the Metal Transfermentioning

confidence: 99%

The potential of wire feed pulsation to influence factors that govern weld penetration in GMA welding

Jorge

Scotti

Reis

et al. 2020

Int J Adv Manuf Technol

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Derivative welding processes are in many cases capable of altering phenomena that determine fundamental aspects of weld bead formation. Some of these evolutions act over the wire feed dynamics. However, in this scenario, the effects of the wire feed pulsation on the weld bead formation governing factors have not been fully explored yet. Therefore, this work aimed at examining how a wire feed pulsation approach affects the droplet transfer in gas metal arc welding and how its interaction with the molten pool defines the weld bead penetration. Bead-on-plate weldments were produced by varying the wire feed pulsation frequency, yet keeping the same levels of arc energy and wire feed speed, with the power source operating in constant voltage and current modes. To assess the droplet transfer behavior, high-speed imaging was used. The geometry of the weld beads was compared in terms of fusion penetration. The results showed that an increase in the wire feed pulsation frequency intensifies the detachment frequency of the droplets, being possible to accomplish a stable metal transfer with them straightly projected toward the weld pool, which contributed to a centralized-increased penetration profile. Based on a descriptive model, it was demonstrated that the increase in droplet momentum or kinetic energy, due to the wire feed pulsation, was not enough to justify the penetration enhancement. It was concluded that the wire feed dynamics can also stimulate surface tension variations in the weld pool and therefore disrupt the behavior of its mass and heat convection, supporting fusion penetration.

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“…The strand cooling process is accompanied by multiple processes, which influence the final product quality [1,2]. Heat transfer during contact of the strand with the cooled withdrawal and support rolls, which are located in the secondary cooling zone, is difficult to describe [3].…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Rywotycki¹,

Malinowski²,

Sołek³

et al. 2019

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Determining the boundary conditions of heat transfer in steel manufacturing is a very important issue. The heat transfer effect during contact of two solid bodies occurs in the continuous casting steel process. The temperature fields of solids taking part in heat transfer are described by the Fourier equation. The boundary conditions of heat transfer must be determined to get an accurate solution to the heat conduction equation. The heat flux between the tool and the object processed depends mainly on temperature, pressure and time.It is very difficult and complicated to accomplish direct identification and determination of the boundary conditions in this process. The solution to this problem may be the construction of a process model, performing measurements at a test stand, and using numerical methods. The proposed model must be verified on the basis of parameters which can easily be measured in industrial processes. One of them is temperature, which may be used in inverse methods to determine the heat transfer coefficient.This work presents the methodology for determining the heat flux between two solid bodies staying in contact. It consists of two stages -the experiment and the numerical computation. The problem was solved by using the finite element method (FEM) and a numerical program developed at AGH University of Science and Technology in Krakow.The findings of the conducted research are relationships describing the value of the heat flux versus the contact time and surface temperature.

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Modelling Liquid Steel Motion Caused by Electromagnetic Stirring in Continuous Casting Steel Process

Cited by 15 publications

References 6 publications

The Simulation and Optimization of an Electromagnetic Field in a Vertical Continuous Casting Mold for a Large Bloom

The Simulation and Optimization of an Electromagnetic Field in a Vertical Continuous Casting Mold for a Large Bloom

The potential of wire feed pulsation to influence factors that govern weld penetration in GMA welding

Archives of Metallurgy and Materials

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