Français
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...
The Ultimate Scientific and Technical Reference
This article is included in
Metal forming and foundry
This offer includes:
Knowledge Base
Updated and enriched with articles validated by our scientific committees
Services
A set of exclusive tools to complement the resources
Practical Path
Operational and didactic, to guarantee the acquisition of transversal skills
Doc & Quiz
Interactive articles with quizzes, for constructive reading
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) ...
Suppliers
FERROPEM, FERROATLANTICA group, 517, avenue de la Boisse 73000 CHAMBERY.
FOSECO SAS Le Newton C, 7 Mail Barthélémy Thimonnier Lognes, 77437 Marne La Vallée, Cedex 02
Documentation
Éditions Techniques de Fonderie (ETIF), 44 avenue de la Division Leclerc, 92318 Sèvres Cedex.
Center des Matériaux UMR CNRS 7633, Mines ParisTech, BP 87, 91003 Evry Cedex.
Laboratoire Procédés et Ingénierie en Mécanique et Matériaux, UMR CNRS 8006, Arts et Métiers ParisTech, 151 bd de...
The Ultimate Scientific and Technical Reference
