Abstract
A promising strategy for upscaling ultrasonic melt treatmentUltrasonic melt treatment (UST) during direct-chill (DC) casting is through a strategically placed flow management system in the launder. This aims at improving the melt residence time and acoustic pressure distribution, which ultimately optimizes the treatment efficiency. This work focuses on observing the effect of partitions and UST on the resultant grain refinement upon DC castingDC casting of an AA6XXX aluminum alloy with Zr additions. Billets 152 mm in diameter were cast in a pilot-scale DC castingDC casting facility: cases with and without partitions and with and without UST were compared. The effect of partitions on the UST efficiency was quantified through macro- and microstructure observations and supported with acoustic pressure measurementsAcoustic pressure measurement. The positive impact of partitions on the grain refinement upon UST is demonstrated.
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