Nucleation and solidification of thin walled ductile iron - Experiments and numerical simulation

[摘要] Investigation of solidification of thin walled ductile cast iron has been performed based on experiments and numerical simulation. The experiments were based on temperature measurement and microstructure examination. Both hyper- and near-eutectic alloys have been investigated with plate thicknesses of 2.8, 4.3 and 8 mm. Temperature measurement revealed that eutectic solidification in the thinner plates (<= 4.3 mm) was divided into two stages. The first stage was relatively short with little or no recalescence. The second stage was the main stage with a larger recalescence. In 8 mm plates the eutectic solidification had only one main stage. Color etching revealed the presence of austenite dendrites. Results of the experiments have been compared with a I-D numerical solidification model that takes into account the precipitation of off-eutectic austenite during the eutectic stage. Simulations reveal that the first stage of eutectic solidification in the thin plates can be explained by growth of off-eutectic austenite. (c) 2005 Published by Elsevier B.V.

[发布日期] 2005-12-15

[效力级别]  Proceedings Paper

[关键词] ductile iron;solidification;thin walled casting;numerical simulation