Numerical and experimental studies of surface-pulsed magneto-oscillation on solidification

Zhao, Jun; Cheng, Y. Frank; Han, Ke; Zhang, Xunzhe; Xu, Zhenming; Zhai, Qijie

doi:10.1016/j.jmatprotec.2015.09.027

Cited by 23 publications

(10 citation statements)

References 13 publications

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“…The results show that the velocity magnitude first increases to the maxima quickly then decreases slowly after multiple cycles and finally reaches a stable with showing the periodic oscillation. The obtained results are consistent with that reported by Zhao et al (2016) and Chen and Shen (2018). The reason of the rapid rise in velocity magnitude is that the high temperature melts located at the interior liquid pool and shunt plate have been transferred to the side surface of the melt due to the forced flow with applying the magnetic field.…”

Section: Resultssupporting

confidence: 91%

Numerical study of flow and heat transfer behaviors during direct-chill casting of large-size magnesium alloy billet under pulsed magnetic field

Duan

Yin

Liu

et al. 2020

HFF

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Purpose The purpose of this paper is to investigate the effect of pulsed magnetic field (PMF) with different duty cycles on the melt flow and heat transfer behaviors during direct-chill (DC) casting of large-size magnesium alloy billet and find the appropriate range of duty cycle. Design/methodology/approach A transient two-dimensional mathematical model coupled electromagnetic field, flow field and thermal field, is conducted to study the melt flow and temperature field under PMF and compared with that under the harmonic magnetic field. Findings The results reveal that melt vibration and fluctuation are generated due to the instantaneous impact of repeated thrust and pull effects of Lorentz force under PMF. The peak of Lorentz force decreases greatly with the increasing duty cycle, but the melt fluctuation region is expanded with higher duty cycle, which accelerates the interior melt velocity and reduces the temperature gradient at the liquid-solid interface. However, PMF with overly high duty cycle has adverse effect on the melt convection and limited influence on the interior melt. A duty cycle of 20% to 50% is a reasonable range. Practical implications This paper can provide guiding significance for the setting of duty cycle parameters on DC casting under PMF. Originality/value There are few reports on the effect of PMF parameters during DC casting with applying PMF, especially for duty cycle, a parameter unique to PMF. The findings will be helpful for applying the external field of PMF on DC casting.

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Section: Resultssupporting

confidence: 91%

Numerical study of flow and heat transfer behaviors during direct-chill casting of large-size magnesium alloy billet under pulsed magnetic field

Duan

Yin

Liu

et al. 2020

HFF

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“…They found that the distribution of the flow field is stable after 16 pulse cycles. Zhao et al [12] studied the distributions of the magnetic field, flow field, and temperature field in pure aluminum under surface-pulsed magneto-oscillation.…”

Section: Introductionmentioning

confidence: 99%

“…The above simulations only considered the melts themselves [7][8][9][10][11][12][13]. The material parameters such as resistivity used to calculate the magnetic field and electromagnetic force in the above calculation mode were those of the pure melt.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Influence of Pulsed Magnetic Field on the Superalloy Melt with the Solid–Liquid Interface in Directional Solidification

Zhang

Yang

2020

Acta Metall. Sin. (Engl. Lett.)

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The effect of the pulsed magnetic field on the grain refinement of superalloy K4169 has been studied in directional solidification. In the presence of the solid-liquid interface condition, the distributions of the electromagnetic force, flow field, temperature field, and Joule heat in front of the solid-liquid interface in directional solidification with the pulsed magnetic field are simulated. The calculation results show that the largest electromagnetic force in the melt appears near the solidliquid interface, and the electromagnetic force is distributed in a gradient. There are intensive electromagnetic vibrations in front of the solid-liquid interface. The forced melt convection is mainly concentrated in front of the solid-liquid interface, accompanied by a larger flow velocity. The simulation results indicate that the grain refinement is attributed to that the electromagnetic vibration and forced convection increase the nucleation rate and the probability of dendrite fragments survival, for making dendrite easily fragmented, homogenizing the melt temperature, and increasing the undercooling in front of the solid-liquid interface.

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“…Previous simulation results showed that Joule heat varied with time and space and the maximum of value of Joule heat appeared at T/2 [19]. Distribution analyses of Joule heat at T/2 in SPMO, HPMO and CPMO with the same pulsed current parameters showed that Joule heat was concentrated near the coil (Fig.…”

Section: Distribution Of Joule Heatmentioning

confidence: 78%

Improving the Solidified Structure by Optimization of Coil Configuration in Pulsed Magneto-Oscillation

Zhao

Han

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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Using both numerical and experimental methods, we studied the effect of coil configuration of pulsed magneto-oscillation (PMO) on distribution of electromagnetic field, flow field and solidification structure with the same pulse current parameters in Al ingots. We designed and constructed three types of coils: surface pulsed magneto-oscillation, hot-top pulsed magneto-oscillation (HPMO) and combined pulsed magneto-oscillation (CPMO). PMO treatment refined the solidification structure in all the ingots. The configuration of the PMO, however, introduced differences in magnetic field intensity, electromagnetic force, Joule heat, flow field, equiaxed grain zone, grain size and growth direction of columnar grains. The largest equiaxed grain zone was found in CPMO treated ingot, and the smallest grain size was found in both HPMO and CPMO treated ingots. Numerical simulation indicated that difference in electromagnetic field and flow field resulted in differences in solidification structure. HPMO is more advantageous over others for large ingot production.

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Numerical and experimental studies of surface-pulsed magneto-oscillation on solidification

Cited by 23 publications

References 13 publications

Numerical study of flow and heat transfer behaviors during direct-chill casting of large-size magnesium alloy billet under pulsed magnetic field

Numerical study of flow and heat transfer behaviors during direct-chill casting of large-size magnesium alloy billet under pulsed magnetic field

Simulation of the Influence of Pulsed Magnetic Field on the Superalloy Melt with the Solid–Liquid Interface in Directional Solidification

Improving the Solidified Structure by Optimization of Coil Configuration in Pulsed Magneto-Oscillation

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