Section 37
Chapter 36,306

Numerical simulation of the solidification processes of copper during vacuum continuous casting

Coimbra, Joao Carlos; Pinto, Iraja Damiani; Wurdig, Norma Luiza; Do Carmo, Dermeval Aparecido

Journal of Crystal Growth 343(1): 0-54


ISSN/ISBN: 0022-0248
DOI: 10.1016/j.jcrysgro.2011.12.074
Accession: 036305762

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A numerical simulation method is used to analyse the microstructure evolution of 8-mm-diameter copper rods during the vacuum continuous casting (VCC) process. The macro-microscopic coupling method is adopted to develop a temperature field model and a microstructure prediction model. The effects of casting parameters, including casting speed, pouring temperature, cooling rate, and casting dimension, on the location and shape of the solid-liquid (S/L) interface and solidified microstructure are considered. Simulation results show that the casting speed has a large effect on the position and shape of the S/L interface and grain morphology. With an increase of casting speed, the shape of the S/L interface changes from a planar shape into an elliptical shape or a narrow, pear shape and the grain morphology indicates a change from axial growth to axial-radial growth or completely radial growth. The simulation predictions agree well with the microstructure observations of cast specimens. Further analysis of the effects of other casting parameters on the position and shape of the S/L interface reveals that the casting dimension has more influence on the position and shape of the S/L interface and grain morphology than do pouring temperature and cooling rate. The simulation results can be summarized to obtain a discriminant of shape factor (?), which defines the shape of the S/L interface and grain morphology.Using FDM to solve the heat transfer equation correctly predicts the temperature field in VCC. Using CA model to simulate the microstructure in VCC reproduces the evolution of grain growth. The casting speed is one of the main factors that affect the solidification microstructure..

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