Distribution of nonmetallic inclusions in molten steel under hot-top pulsed magneto-oscillation treatment

Li, Huicheng; Liu, Zhen; Li, Renxing; Gong, Yu; Xu, Zhenming; Zhai, Qijie

doi:10.1007/s42243-018-0112-5

Cited by 7 publications

(5 citation statements)

References 44 publications

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“…[22][23][24][25] Recently, PMO has found commercial applications in inducing grain refinement and reducing macro-segregation in continuous casting steel billets. [26,27] Furthermore, variants like surface pulsed magnetooscillation (SPMO) [28,29] and hot-top pulsed magneto-oscillation (HPMO) [30][31][32][33][34][35][36] have been developed to enhance the solidified structures in large steel ingots. A comprehensive study by Zhao et al [29][30][31]34] compared SPMO and HPMO, considering factors like coil position, electromagnetic fields, and flow distribution's impact on grain size.…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that HPMO application led to finer grain size in solidified alloys. Li et al [32,33] observed that HPMO promotes the transition from columnar to equiaxed grains, homogenizes the distribution of carbon elements, and enhances the compactness of steel ingots. Additionally, Zhong et al [35,36] simulated the forced flow of molten metal alloys under modified HPMO to eliminate nonuniformity and macro-segregation at the upper part of the heavy ingot body.…”

Section: Introductionmentioning

confidence: 99%

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Evolution of Electromagnetic Fields and Forced Flow in a Metal Melt under the Impact of Hot‐Top Pulsed Magneto‐Oscillation

Zhou,

Chen,

Zhang

et al. 2024

steel research int.

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Hot‐top pulsed magneto‐oscillation (HPMO) is developed as a novel approach to achieve grain refinement and solute homogenization in heavy steel ingots. Through a combination of numerical simulations and melt flow measurements, this study investigates the evolution of electromagnetic fields and forced flow within alloy melts under the influence of HPMO, with a focus on varying electromagnetic parameters such as electric current intensity, frequency, and pulse length. The results of the simulations reveal the formation of double‐circulating flows in opposite directions within the melt. Experimental measurements of the flow field distribution closely align with the simulation outcomes. Furthermore, it is observed that the induced magnetic field inside the melt changes direction once, and the electromagnetic force changes direction three times within a single pulse length period under the influence of HPMO. Notably, the radial electromagnetic force, directed toward the interior of the melt, surpasses the normal electromagnetic force away from the melt. This phenomenon leads to a stable flow of the melt, contributing to grain refinement. The findings presented in this study offer valuable insights into the use of HPMO as a promising technique for improving the quality of heavy steel ingots.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evolution of Electromagnetic Fields and Forced Flow in a Metal Melt under the Impact of Hot‐Top Pulsed Magneto‐Oscillation

Zhou,

Chen,

Zhang

et al. 2024

steel research int.

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“…It is very significant to increase the cleanliness of liquid steel to meet the requirements of high-quality steel. 1,2) As the last refractory container of a metal-casting system, the tundish is the key to ensure continuous metal-casting. [3][4][5] To enable suitable flow conditions and avoid/reduce inclusions in the tundish, different systems, such as inhibitors, dams, weirs, and baffles are commonly used to control flow.…”

Section: Introductionmentioning

confidence: 99%

Effect of an AC Magnetic-field on the Dead-zone Range of Inclusions in the Circular Channel of an Induction-heating Tundish

Zhang

Iwai

2022

ISIJ Int.

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In this paper, the radial electromagnetic force in the horizontal circular channel of an induction-heating tundish is derived. A dimensionless trajectory model of the inclusion is developed and numerically solved to acquire the trajectory of the moving inclusion. When the inclusion is in the lower half of the horizontal circular channel, the direction of the vertical component of the radial electromagnetic pinch force which acts on the inclusion is opposite to the buoyancy. Provided their magnitudes are the same, there is a balanced-position for the inclusions in a circular channel. Therefore, a dead-zone exists near the balancedposition, where the removal time of the inclusion with an AC magnetic-field is longer than without it. Then, the effect of the AC magnetic-field parameters on the range of the dead-zone is identified, which makes it possible to improve the removal efficiency of inclusions. The range of the dead-zone decreases with increasing magnetic-field intensity. When the dimensionless magnetic-field intensity is 56.3, the shielding parameter of 10-15.9 are optimal to decrease the range of the dead-zone. KEY WORDS: inclusions; AC magnetic-field; dead-zone; horizontal circular channel; channel-type inductionheating tundish.

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“…Researchers who applied PMO to pure Al during its nucleation stage and the first half of its growing stage have consistently observed structural refinement and equiaxed-zone enlargement in the resulting ingot, leading them to deduce that the PMO treatment makes nuclei more likely to drop out of the solidifying top surface of the melt or from the mold walls themselves into the deeper liquid part of the melt. This process, known as nucleus drifting, enhances structural refinement [16][17][18]. PMO promotes heterogeneous nucleation near the solid-liquid interface, and the resulting forced convection causes the partly solidified grains to move away from the solid-liquid interface and become randomly distributed throughout the melt [19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Coil Configuration Design on Al Solidified Structure Refinement

Zhao

Han

et al. 2020

Metals

Self Cite

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This paper outlines our effort to optimize PMO (Pulsed Magneto-Oscillation) design in order to improve the efficiency of ingot manufacturing. SPMO-H (Simplified Surface Pulse Magneto-Oscillation) and CPMO-H (Simplified Compound Pulse Magneto-Oscillation) were presented on the basis of SPMO (Surface Pulse Magneto-Oscillation) and CPMO (Compound Pulse Magneto-Oscillation). Our numerical and experimental results showed that optimized PMO coil design offered us a device that enabled the operator to examine and operate the melt more convenient without losing the efficiency and decreasing refinement effect. Our work also showed the distance between the coil and the melt surface had little effect on the grain sizes refined. Therefore, in ingot production, the dropping of melt surface is not a problem for PMO application.

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Distribution of nonmetallic inclusions in molten steel under hot-top pulsed magneto-oscillation treatment

Cited by 7 publications

References 44 publications

Evolution of Electromagnetic Fields and Forced Flow in a Metal Melt under the Impact of Hot‐Top Pulsed Magneto‐Oscillation

Evolution of Electromagnetic Fields and Forced Flow in a Metal Melt under the Impact of Hot‐Top Pulsed Magneto‐Oscillation

Effect of an AC Magnetic-field on the Dead-zone Range of Inclusions in the Circular Channel of an Induction-heating Tundish

Effect of Coil Configuration Design on Al Solidified Structure Refinement

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