Modelling of Eutectic Saturation Influence on Microstructure in Thin Wall Ductile Iron Casting Using Cellular Automata

Abstract

The mathematical model of the globular eutectic solidification in 2D was designed. Proposed model is based on the Cellular Automaton Finite Differences (CA-FD) calculation method. Model has been used for studies of the primary austenite and of globular eutectic grains growth during the ductile iron solidification in the thin wall casting. Model takes into account, among other things, non-uniform temperature distribution in the casting wall cross-section, kinetics of the austenite and graphite grains nucleation, and non-equilibrium nature of the interphase boundary migration. Calculation of eutectic saturation influence (Sc = 0.9 - 1.1) on microstructure (austenite and graphite fraction, density of austenite and graphite grains) and temperature curves in 2 mm wall ductile iron casting has been done.

Design of the Casting Technology using Foundry Simulation Codes – Development Condition

“…Unfortunately, most of the described models, included in, the so-called, multiphysics family, in terms of creating mechanisms and structure prediction, refer to the geometric modelling of local, i.e. very small, isolated areas, without reference to the whole casting [18]. E.g.…”

Cellular Automaton Simulation For Volume Changes Of Solidifying Nodular Cast Iron

“…The details of the numerical simulation of stochastic nucleation are described in [29]. Other details of the used CA-FD model of a two-phase eutectic solidification were introduced elsewhere [9][10][11]30].…”

“…This paper presents assessments of change in the specific volume of DI during crystallization using model of solidification based on cellular automata method [8][9][10][11].…”