Microstructural Simulation of Solidification Process of Spheroidal-Graphite Cast Iron

[+] Author and Article Information
Patricia M. Dardati

Department of Industrial Engineering, Regional Faculty at Córdoba,  National Technological University, M. López and Cruz Roja Argentina, Córdoba, Argentinapdardati@industrial.frc.utn.edu.ar

Luis A. Godoy

Department of Structures, Faculty of Exact, Physical and Natural Sciences,  National University of Córdoba and CONICET, Av. Vélez Sarsfield 1601, Córdoba, Argentinalgodoy@com.uncor.edu

Diego J. Celentano

Department of Mechanical Engineering,  University of Santiago de Chile, 3363 O’Higgins Ave., Santiago, Chiledcelenta@lauca.usach.cl

J. Appl. Mech 73(6), 977-983 (Jan 26, 2006) (7 pages) doi:10.1115/1.2189876 History: Received June 14, 2005; Revised January 26, 2006

This paper presents a new micro-macro approach for the thermo-microstructural behavior of the solidification process of an eutectic ductile cast iron. The thermal balance is written at a macroscopic level and can take into account both the structural component being cast and its mold. Models of nucleation and growth represent the evolution of the microstructure, following a multinodular solidification theory with independent nucleation of graphite and austenite and a dendritic growth of austenite. The resulting formulation is solved using a finite element discretization of the macro domain, in which the evolution of the microstructure is taken into account at the Gauss integration points. The quantitative agreement between experimental and computational values in terms of cooling curves is acceptable.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

(a) Schematic representation of equiaxial dendrite grain, (b) spherical solute concentration, (c) schematic representation of equiaxial dendrite grain and spherical graphite nodules, and (d) spherical solute concentration. Spherical symmetry is assumed in this work.

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Figure 2

(a) Component fractions of an equiaxial dendritic grain in the solidification of one phase and (b) Component fractions of an equiaxial dendritic grain in the solidification of an eutectic SG iron

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Figure 3

(a) Carbon concentration considering the solute layer thickness and (b) carbon concentration without consideration of the solute layer

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Figure 4

Changes in the carbon concentration in a time step

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Figure 5

Geometry of the coupon and the mold

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Figure 6

Computational and experimental cooling curves at the casting edge and at the casting center

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Figure 7

Evolution of liquid (fl), austenite (fγ), and graphite (fgr) fractions at an intermediate location

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Figure 8

Growth of the radii RT, Rg, and Rn

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Figure 9

Graphite volume distribution computed near the casting edge



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