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Modeling of macrosegregation and solidification microstructure for Al-Si alloy under unidirectional solidification by a coupled cellular automaton-finite volume model
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2012 (English)In: MCWASP XIII: International Conference On Modeling Of Casting, Welding And Advanced Solidification Processes, Institute of Physics (IOP), 2012, no 1, 012093- p.Conference paper (Refereed)
Abstract [en]

A coupled Cellular Automaton-Finite Volume (CA-FV) model is developed for the prediction of macrosegregation and solidification microstructure of an Al-Si binary alloy under unidirectional solidification. The enthalpy, concentration and velocities are calculated at FV scale following macroscopic fluid flow, heat and solute transfer equations. The temperature and solid fraction are updated at CA scale from both the energy balance and the nucleation, grain growth under fluid flow and entrapment procedure with the help of microsegregation approximation. The variables at FV and CA sites exchange information through topological relations. The recalescence and the inter- and intra-granular segregation during solidification are predicted. The effects of thermal/solutal buoyancy and the grain structure on molten natural convection and the segregation pattern are also analyzed. Verification of the model has been done using the previous experimental solidification morphologies by other researchers.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2012. no 1, 012093- p.
, IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981 ; 33
Keyword [en]
Macroscopic fluid flow, Macrosegregations, Micro-segregation, Segregation patterns, Solidification microstructures, Solidification morphology, Topological relations, Unidirectional solidification, Aluminum, Cellular automata, Grain growth, Microstructure, Segregation (metallography), Silicon, Silicon alloys, Welding, Solidification
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-129780DOI: 10.1088/1757-899X/33/1/012093ISI: 000307779900093ScopusID: 2-s2.0-84877882574OAI: diva2:654000
13th International Conference on Modeling of Casting, Welding and Advanced Solidification Processes, MCWASP 2012; Schladming; Austria; 17 June 2012 through 22 June 2012

QC 20131007

Available from: 2013-10-07 Created: 2013-10-04 Last updated: 2013-10-07Bibliographically approved

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Nakajima, Keiji
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