The effect of pulse magneto-oscillation treatment on the structure of aluminum solidified under controlled convection

Edry, Itzhak; Frage, N.; Hayun, Shmuel

doi:10.1016/j.matlet.2016.06.106

Cited by 28 publications

(10 citation statements)

References 17 publications

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“…The effects of electric and magnetic fields on ferromagnetic and non-ferromagnetic materials during the solidification and subsequent heat treatment have been confirmed [12]. For example, it has achieved good results in refining grains [13,14], reducing the shrinkage porosity defects in ingots and improving ingot quality [15,16], enhancing the cleanliness of microstructure [17], and promoting the distribution of precipitates [18,19]. Moreover, electromagnetic stirring is a non-contact forced stirring method, which avoids the contamination of the molten metal, and offers a new approach for the elimination of macrosegregation in TRC technology.…”

Section: Introductionmentioning

confidence: 92%

Mechanism of Electromagnetic Field in the Sub-RapidSolidification of High-Strength Al-Cu-Li Alloy Produced by Twin-Roll Casting

Wei

et al. 2021

Metals

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In this work, a Al-Cu-Li alloy plate with outstanding mechanical properties was successfully prepared with electromagnetic twin-roll casting (TRC) technology. The microstructure of Al-Cu-Li alloy manufactured by conventional mold casting, TRC, and electromagnetic TRC was studied in detail. The action mechanism of electromagnetic oscillation field (EOF) in the TRC process was studied by systematic experimental characterization and numerical simulation. The results show that the EOF will enlarge the circumfluence area in the cast-rolling zone, accelerate the mass transfer and heat transfer in the molten pool, and make the solute field and flow field in the liquid cavity tend to be evenly distributed. Further, the introduction of the EOF will produce the electromagnetic body force F with the maximum strength of 14 N/m3. The F acting on the solidification front will eliminate the accumulation and deposition of Cu2+, Li+, Mg2+, Zn2+, Mn2+ at the dendrite tip and inhibit the growth of dendrites. At the same time, the F can refine the microstructure of the TRC plate, promote the formation of equiaxed crystals, improve the supersaturated solid solubility of solute elements in the a(Al) matrix, and avoid the appearance of obvious solute segregation area or the formation of excessive solute enrichment area. Therefore, the macro-segregation in TRC plate was significantly reduced, the solidification structure was dramatically refined, and the comprehensive properties of the alloy were remarkably improved.

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Section: Introductionmentioning

confidence: 92%

Mechanism of Electromagnetic Field in the Sub-RapidSolidification of High-Strength Al-Cu-Li Alloy Produced by Twin-Roll Casting

Wei

et al. 2021

Metals

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“…The main parameters of PMO, including the peak current, the frequency, and the configuration of the PMO coil, can all be easily adjusted and controlled. Refinement effect was better with higher peak current and lower frequency [19,[21][22][23][24][25][26]. PMO treatment shows great promise in the production of heavy steel ingots on an industrial scale [27].…”

Section: Introductionmentioning

confidence: 97%

Effect of Coil Configuration Design on Al Solidified Structure Refinement

Zhao

Han

et al. 2020

Metals

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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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“…Itzhak et al studied the effect of application of PMO at different stages of solidification and under different cooling rate on both the solidification structure and the recalescence temperature [15][16][17]. Sun et al [18] deduced that the convection in steel melt induced by PMO forced the grains to move from the solid-liquid interface, which resulted in the formation of uniformly distributed dendrites throughout the whole ingot.…”

Section: Introductionmentioning

confidence: 99%

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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The effect of pulse magneto-oscillation treatment on the structure of aluminum solidified under controlled convection

Cited by 28 publications

References 17 publications

Mechanism of Electromagnetic Field in the Sub-RapidSolidification of High-Strength Al-Cu-Li Alloy Produced by Twin-Roll Casting

Mechanism of Electromagnetic Field in the Sub-RapidSolidification of High-Strength Al-Cu-Li Alloy Produced by Twin-Roll Casting

Effect of Coil Configuration Design on Al Solidified Structure Refinement

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

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