|About this Abstract
||Liquid Metal Processing & Casting Conference (LMPC 2019)
||Liquid Metal Processing & Casting
||A Study on the Microstructural Development of a Multicomponent Al-14Si Casting Alloy with Ultrasonic Melt Treatment
||Young-Hee Cho, Min-Su Jo, Su-Hyeon Kim, Jae-Gil Jung, Jung-Moo Lee
|On-Site Speaker (Planned)
Ultrasonic melt treatment (UST) was applied to a multicomponent Al-14Si piston alloy at 800 °C, followed by casting into a steel step mould at various cooling rates in a range of 4-32 K/sec. UST in the fully liquid state significantly reduced the sizes of primary intermetallics forming in the initial stage of solidification and the structural refinement by UST became more pronounced when increasing the cooling rate. It was found that the ultrasonic refinement involved the microstructural homogeneity, while affecting the overall features of intermetallics including the composition, size, morphology and distribution. The effect of fast cooling rate, however, was only limited to the size reduction in all the constituent phases. The internal structure of multiphase networks developed under each different processing condition is also characterized by means of the 2D and the 3D analysis methods and a key microstructural factor contributing to the interconnectivity is discussed.
||Definite: At-meeting proceedings