|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Cast Shop Technology
||Full Size Measurement and Simple Prediction on Macro Segregation of Aluminum Alloys Elements in Industrial DC Casting Slab
||Tatsuya Yamada, Nobuhito Ishikawa, Takashi Kubo, Koichi Takahashi
|On-Site Speaker (Planned)
In direct chill casting of aluminum alloys, macro segregation can occur at the center of the slab. It is very important to investigate the mechanism because it influences the mechanical and chemical properties of the wrought products. The authors have performed a two-dimensional measurement of the macro segregation by optical emission spectroscopy, and important characteristics of this phenomenon were observed. They are explained qualitatively and quantitatively by our proposed hypothesis, the partially swept solute model. The model assumes that the sump flow penetrating into the mushy zone will sweep out the enriched or diluted liquid solute until the critical solid fraction fs* is reached, when the dendrite arms begin to sufficiently entangle with each other, making it difficult for the sump flow to penetrate into the mushy zone. Then, the ordinary solidification process continues.
||Planned: Light Metals