A Possible Mechanism for the Formation of Exploded Graphite in Nodular Cast Irons
Résumé
In hypereutectic nodular cast irons, primary precipitation of graphite may lead to graphite
flotation in thick section castings. Graphite degeneracy such as so-called exploded graphite is then
often associated with this flotation phenomenon and it appears as precipitates where the nodular
form is replaced by star-like or flower-like shape. It has been reported that exploded graphite
develops after the primary spheroidal nodules have reached some tens of microns in diameter. In
this contribution, a model for this transition is presented.
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