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Simulation of macrosegregation and solidification microstructure evolution for Al-Si alloy by coupled cellular automaton-finite volume model
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
2012 (English)In: Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals, ISSN 1004-0609, Vol. 22, no 7, 1883-1896 p.Article in journal (Refereed) Published
Abstract [en]

A coupled cellular automaton-finite volume (CA-FV) model for macroscopic fluid flow, heat transfer, solute transport and microscopic nucleation and grain growth procedure was developed and applied in an Al-Si binary alloy solidification process. The model reflects the dendrite growth kinetics in the presence of fluid flow, the nucleation and growth in CA scale due to the increase of undercooling, and the feedback of solid fraction and temperature to FV nodes due to the nucleation and growth. The coupled CA-FV model can predict the recalescence and the intergranular segregation during alloy solidification process, which shows great advantages compared with the results by FV model and CA-FV model without fluid flow. The effects of fluid flow on the solute distribution and the solidification morphologies, as well as the influence of ingot size on the solidification structures, were discussed with the CA-FV model.

Place, publisher, year, edition, pages
2012. Vol. 22, no 7, 1883-1896 p.
Keyword [en]
Al-Si alloy, Cellular automaton-finite volume method, Grain growth, Macrosegregation, Solidification
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-105267Scopus ID: 2-s2.0-84867287870OAI: oai:DiVA.org:kth-105267DiVA: diva2:570504
Note

QC 20121119

Available from: 2012-11-19 Created: 2012-11-19 Last updated: 2012-11-19Bibliographically approved

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