CELLULAR AUTOMATON MODELING OF SOLIDIFICATION MTCROSTRUCTURE OF Al-Si ALLOY
(0) A coupled CA-FD model (cellular automaton - finite difference) is developed to analyze the microstructure evolution and the columnar-equiaxed transition (CET transition) during the process of Al- Si binary alloy solidification. This model includes the heat transfer, the solute transport, the eutectic reaction, the nucleation and the growth procedure. The results show the influences of Si content, cooling intensity and nucleation parameters such as the nucleation density and the nucleation undercooling et al on the solidification morphology and CET transition. The grain size distribution is evaluated by the centerline evaluation method and the nucleation parameters related to the experimental conditions can be estimated by numerical method. The critical undercooling range for CET transition in the cases of different Si content and different cooling intensity are determined by predicted solidification morphology, which agree well with the literature.
CA-FD model Solidification microstructure CET transition
Hongwei ZHANG Keiji NAKAJIMA Qiang WANG Tie LIU Wei XING Jicheng HE
Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern Unive Division of Applied Process Metallurgy, Department of Materials Science and Engineering, Royal Insti
国际会议
大连
英文
233-240
2007-08-19（万方平台首次上网日期，不代表论文的发表时间）