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HomeMaterials Science ForumMaterials Science Forum Vol. 925Revisiting Models for Spheroidal Graphite Growth

Revisiting Models for Spheroidal Graphite Growth

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Abstract:

Recent experiments resolved nucleation and growth of graphite during solidification of ductile cast iron in 4D using synchrotron X-ray tomography. A numerical model for microstructure formation during solidification is compared with the experiments. Despite very good overall agreement between observations of spheroidal graphite growth and model results, significant deviations exist towards the end of solidification. We use the experimental observations to analyse the relation between graphite growth rate and the state of the particle neighbourhood to pinpoint possible links between growth rate of individual graphite spheres and the overall solidification state. With this insight we revisit existing models for growth of spheroidal graphite and discuss possible modifications in order to correctly describe the critical final stage of solidification.

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Science and Processing of Cast Iron XI

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Periodical:

Materials Science Forum (Volume 925)

Pages:

118-124

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.925.118

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Online since:

June 2018

Authors:

Mathias Karsten Bjerre, Mohammed Azeem, Peter D. Lee, Jesper Henri Hattel, Niels Skat Tiedje*

Keywords:

Cast Iron, Ductile Iron, Graphite, Modelling, X-Ray Tomography

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* - Corresponding Author

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