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1. Elaboration
1.1 Spheroidal graphite formation
Graphite spheroids appear in liquid metal, not solid. As solidification progresses, the spheroid is surrounded by an austenite sheath through which carbon must diffuse to crystallize on the graphite spheroid. This phenomenon can be seen in the thermal analysis of spheroidal graphite cast iron. The "temperature vs. time" curve shows no eutectic plateau, reflecting the lack of equilibrium between the liquid and solid phases, and hence the loss of contact between liquid and graphite.
Spheroids are formed from "heterogeneous" seeds, foreign particles whose crystalline system enables graphite crystallization (which occurs in the hexagonal system).
Magnesium is not the only element that promotes the formation...
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Elaboration
Mechanical characteristics
Bibliography
Websites
Fontes Moulées Information Center :
Syndicat des Fondeurs de France :
Association Technique de Fonderie :
...Standards and norms
- Microstructure of cast irons – Part 1: graphite classification by visual analysis. - NF EN ISO 945-1 - (mai 2009)
- Foundry – Classification and designation of raw fonts: symbolic and numerical designation. - NF EN 10-001 -
- Foundry – Cast iron designation system – Symbolic and numerical designation. - NF EN 1560 - (avril 2011)
- Foundry – Spheroidal graphite cast iron. - NF EN 1563 - (février 2012) ...
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