The use of electromagnetic casting for AI alloys and other metals

Evans, J. W.

doi:10.1007/bf03221174

Cited by 26 publications

(17 citation statements)

References 3 publications

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“…Because of the size of the billet in our experiment is 100 mm, and the diameter of the nozzle is about 20 mm, the melt motion toward the center of the sump results from the inflowing metal stream and thermal natural convection. 14) This turbulent convection breaks and carries away the dendrite arm, and also brings heat pulses which accelerate the melting off of dendrites to the interface. So both EMC and DCC specimens have fine structures in this region.…”

Section: Effect Of Coil Current On the Macrostructure Of Emc Al Billetmentioning

confidence: 99%

Improvement of Casting Speed and Billet Quality of Direct Chill Cast Aluminum Wrought Alloy with Combination of Slit Mold and Electromagnetic Coil

et al. 2007

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A mold with slits and external cooling water channels was designed for the direct chill casting processing. By imposing a high frequency magnetic field, the surface quality and microstructure of the direct chill cast billets are improved. The casting speed could be improved by the simultaneous use of mold and electromagnetic coil. In the case of one kind of Al-Cu-Mg alloy with a wide freezing range, the critical casting speed to break-out can be improved 60%. The microstructure of the billet cast with electromagnetic field is more fine and uniform than that of the conventionally cast billet, and the subsurface segregation usually observed in the conventional billets is eliminated.

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Section: Effect Of Coil Current On the Macrostructure Of Emc Al Billetmentioning

confidence: 99%

Improvement of Casting Speed and Billet Quality of Direct Chill Cast Aluminum Wrought Alloy with Combination of Slit Mold and Electromagnetic Coil

et al. 2007

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“…The validation of these models was often done by comparing the computed and measured ingot distortions, e.g. the butt-curl [8] and the rolling face pull-in for rolling sheet ingots produced by DC [9] or electromagnetic casting [11].…”

Section: Introductionmentioning

confidence: 99%

Neutron Diffraction Measurement of As‐Cast Residual Stresses in AA7050 Rolling Plate Ingots: Influence of a Wiper

et al. 2014

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During casting, thermally induced deformations give birth to ingot distortions and residual stresses. For some high strength alloys, ingot cracking can happen during casting per se or during cooling down. Ingot distortions such as rolling face pull-in, but curl and but swell are rather easy to quantify as opposed to internal stresses. As aluminium is rather transparent to neutrons, residual stress measurements using neutron diffraction appeared to be a good way to validate the thermomechanical models aimed at simulating the stress build-up during casting. This technique has been applied to DC cast AA7050 rolling plate ingots with special attention to the stress generation in the transient start-up phase, i.e. in the foot of the ingot. Additional results using the hole drilling method complement the measurements. The measured stress distributions are compared with the results of a numerical model of DC casting for ingots cast with and without a wiper. I IntroductionIn the fabrication of aluminum rolling plates, the first step is the semi-continuous casting of a rectangular ingot. The most commonly used process is known as direct chill (DC) casting [1]. This process gives rise to large thermally induced strains that lead to several types of casting defects (distortions, cold cracks, porosity, solidification cracking, etc.). During casting, thermally induced stresses are partially relieved by permanent deformation. When these residual stresses overcome the deformation limit of the alloy, cracks are generated either during solidification (hot tears) or during cooling (cold cracks). The formation of these cracks results in rejection of the cast part. Furthermore, thermally induced stresses can cause downstream processing issues during the sawing stage prior to rolling. For large ingot formats and high strength alloys, sawing becomes a delicate task owing to the risk of saw pinching or crack initiation ahead of the saw. The use of wipers during casting largely reduces the level of as-cast stresses.The computation of stresses during DC casting of aluminum alloys has been the scope of several studies since the late 90's [2-10] and is a well established technique nowadays. Many numerical models have allowed researchers to compute the ingot distortions and the associated residual stresses. The validation of these models was often done by comparing the computed and measured ingot distortions, e.g. the butt-curl [8] and the rolling face pull-in for rolling sheet ingots produced by DC [9] or electromagnetic casting [11].Validation against the computed room-temperature residual stresses is limited simply owing to the difficulty of measuring the internal strains and the high variability in the measurements. While some measurements are available for quenching [12] or welding [13], they remain rare, uncertain and usually are limited to one or two components of the stress tensor, and to the skin of round billets for as-cast materials [14][15]. In contrast to destructive methods for measuring residual stresses (hole-drilli...

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“…From the above short literature review, it is clearly demonstrated that the main advantage of the EMCC technique is that the surface of the strands is smooth enough to be rolled without the scalping process [15][16][17]. The experimental results showed that the depth of the oscillation mark is decreased from 0.6 × 10 −3 to 1.5 × 10 −4 m [18,19].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation to Facilitate an Improvement in the Design of an Electromagnetic Continuous Casting Mould

et al. 2016

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An electromagnetic continuous casting mould designed is proposed with a non-uniform slit distribution structure. This design has aimed to reduce the number of slits so that the mould's strength is enhanced, whilst maintaining a similar metallurgy effect. In this paper, the metallurgy effect for the designed mould is investigated through the magnetic field distribution along the casting direction, the uniformity feature in the vicinity of the meniscus region, the temperature variation of the molten alloy pool and the mould wall. The results show that the designed mould achieved a similar effect as compared to the original mould; however, the configuration is simplified. This research highlights the topic of mould structure optimization, which would enable the Electromagnetic continuous casting (EMCC) technique to be utilized with greater ease by industry.

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The use of electromagnetic casting for AI alloys and other metals

Cited by 26 publications

References 3 publications

Improvement of Casting Speed and Billet Quality of Direct Chill Cast Aluminum Wrought Alloy with Combination of Slit Mold and Electromagnetic Coil

Improvement of Casting Speed and Billet Quality of Direct Chill Cast Aluminum Wrought Alloy with Combination of Slit Mold and Electromagnetic Coil

Neutron Diffraction Measurement of As‐Cast Residual Stresses in AA7050 Rolling Plate Ingots: Influence of a Wiper

An Experimental Investigation to Facilitate an Improvement in the Design of an Electromagnetic Continuous Casting Mould

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