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Saturday, April 9, 2011

GRAPHITE STRUCTURES IN CAST IRONS: GRAPHITE FORMS

GRAPHITE FORMS

Diagrammatic representations of the standard graphite forms in cast irons.
(Click image to enlarge)




 Table1: Graphite forms
Form
Description of the form
Main spatial
characteristics
Occurrence
I
Lamellar (flake) graphite
Interconnected particles
within eutectic cells;
lamellar (flake) graphite
with sharp ends
·  Principal form in grey cast iron
·  Austenitic cast iron with
lamellar/flake graphite
·  Can occur in the rim zone of other cast-iron materials
II
Crab graphite
Aggregate of graphite
flakes
·  Can occur in rapidly cooled
hypereutectic grey cast irons
·  Can also occur in segregation areas of thick-walled spheroidal-graphite
cast-iron castings
III
Compacted (vermicular)
Graphite
Usually interconnected particles within eutectic
cells; worm-like
appearance with
rounded ends
·  Principal form in compacted-graphite
cast irons
·  Can occur in spheroidal graphite
cast irons
IV
Temper carbon

Irregular spheroidal graphite*
Isolated particles
Principal form in malleable cast irons

Can occur on spheroidal-graphite
cast iron
V
Slightly irregular spheroidal
Graphite
Isolated particles
·  Principal form in thick-walled castings made of spheroidal graphite cast irons
·  Occurs to a specified extent in compacted-graphite cast irons
·  Can occur in malleable cast irons
VI
Spheroidal graphite*
Isolated particles
·  Principal form in castings made of
spheroidal-graphite cast irons
·  Occurs to a specified extent in
compacted-graphite cast irons
Note: *Spheroidal graphite is sometimes referred to as nodular graphite

1 comment:

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