Multi-scale finite element modelling of solidification structures by a splitting method taking into account the transport of equiaxed grains

Autor: Michel Bellet, Hervé Combeau, T T M Nguyen, Miha Založnik, Ch-A Gandin
Přispěvatelé: Centre de Mise en Forme des Matériaux (CEMEF), MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2015
Předmět:
Zdroj: IOP Conference Series
MCWASP XIV: International Conference on Modelling of Casting, Welding and Advanced Solidification Processes
MCWASP XIV: International Conference on Modelling of Casting, Welding and Advanced Solidification Processes, Jun 2015, Awaji island, Hyogo, Japan. pp.012007, ⟨10.1088/1757-899X/84/1/012007⟩
DOI: 10.1088/1757-899X/84/1/012007⟩
Popis: International audience; In solidification processes of large industrial castings and ingots, the transport of solid in the liquid has an important effect on the final grain structure and macrosegregation. Modeling is still challenging as complex interactions between heat and mass transfers at microscopic and macroscopic scales are highly coupled. This paper first presents a multi-scale numerical solidification model coupling nucleation, grain growth and solute diffusion at microscopic scales with heat and mass transfer, including transport of liquid and solid phases at macroscopic scales. The resolution consists of a splitting method, which considers the evolution and interaction of quantities during the process with a transport stage and a growth stage. This splitting reduces the nonlinear complexity of the set of considered equations and provides an efficient numerical implementation. It is inspired by the work of Založnik et al. [1,2], which used a finite volume method (FVM). The present work develops the solution based on the finite element method (FEM). Numerical results obtained with this model are presented and simulations without and with grain transport are compared to study the impact of solid-phase transport on the solidification process and on the formation of macrosegregation.
Databáze: OpenAIRE
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