CELLULAR AUTOMATA MODELLING OF GRAIN COARSENING DURING REIHEATING AND VALIDATION WITH THE EXPERIMENTAL RESULTS
来源期刊：Acta Metallurgica Sinica2005年第2期
论文作者：S.P.Banks E.J.Palmiere W.H.Yu J.T.Han
Key words：computer simulation; grain growth; microstructure; reheating;
Abstract: A novel 2D cellular automata (CA) model has been developed for description of normal grain coarsening and abnormal grain coarsening process. The program reflects the grain coarsening quite well even through the average grain size becomes very large. Follow results have been obtained: (a) The model reflect the normal grain growth kinetics gradually increase with probability and grain growth speed can be controlled. Based on this result, temperature can be coupled in the model. (b) Abnormal grain growth is modelled successfully. (c) Methodology has been put forward to find the relationship between the experiment results and modelling results. The experimental work on the grain coarsening has been carried out. Graphical output matched the realistic microstructure in every detail. Because many physical parameters can be taken into account in the CA programme, this CA model could not only qualitatively demonstrate the grain growth process, but also quantitatively predict and analyse the grain coarsening process.
S.P.Banks1，E.J.Palmiere2，W.H.Yu3，J.T.Han3
(1.Department of Automatic Control and Systems Engineering, University of Sheffield, Sheffield S1 3JD, UK;
2.Department of Engineering Materials, University of Sheffield, Sheffield S1 3JD, UK;
3.School of Materials Science and Engineering, University of Science and Technology Beijing,Beijing 100083, China)
Abstract:A novel 2D cellular automata (CA) model has been developed for description of normal grain coarsening and abnormal grain coarsening process. The program reflects the grain coarsening quite well even through the average grain size becomes very large. Follow results have been obtained: (a) The model reflect the normal grain growth kinetics gradually increase with probability and grain growth speed can be controlled. Based on this result, temperature can be coupled in the model. (b) Abnormal grain growth is modelled successfully. (c) Methodology has been put forward to find the relationship between the experiment results and modelling results. The experimental work on the grain coarsening has been carried out. Graphical output matched the realistic microstructure in every detail. Because many physical parameters can be taken into account in the CA programme, this CA model could not only qualitatively demonstrate the grain growth process, but also quantitatively predict and analyse the grain coarsening process.
Key words:computer simulation; grain growth; microstructure; reheating;
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