|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Cast Shop Technology
||Ultrasonic Assisted Reduction of Hot-tearing during High-speed DC Casting of 6000 Series Aluminum Alloys
||Sergey Komarov, Yasuo Ishiwata, Yoshihiro Takeda
|On-Site Speaker (Planned)
This work presents results of preliminary investigations concerning the effect of ultrasonic vibrations on the solidification structure and hot-tearing susceptibility of 6000 series aluminum alloys in high-speed direct chill casting process. A pilot DC caster was used to produce billets of 82~97 mm in diameter. Ultrasonic vibrations were introduced directly into the caster mold through a high-amplitude ceramic sonotrode, the tip of which was positioned at different distances from the melt crystallization front. Then, the cast billets were investigated for the microstructure and hot tearing susceptibility. The results revealed that the ultrasonic treatment leads to a significant reduction of hot tearing susceptibility although the ultrasonic effect is dependent on the vibration amplitude and sonotrode tip position. It is suggested that ultrasonically improved fluidity of the melt in the mushy zone and uniformity of solidification structure are the major contributor to the reduction in hot tearing susceptibility.
||Planned: Light Metals