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DoITPoMS Micrograph Library Full Record for Micrograph 780
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Full Record for Micrograph 780

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Micrograph no
780
Brief description
Heat treated spheroidal graphite cast iron
Keywords
alloy Link to MATTER Glossary entry for alloy, annealing Link to MATTER Glossary entry for annealing, carbon, cast iron Link to MATTER Glossary entry for cast iron, decarburisation Link to MATTER Glossary entry for decarburisation, ductile Link to MATTER Glossary entry for ductile, ferrite Link to MATTER Glossary entry for ferrite, graphite Link to MATTER Glossary entry for graphite, grey cast iron Link to MATTER Glossary entry for grey cast iron, heat treatment Link to MATTER Glossary entry for heat treatment, iron, magnesium, metal, pearlite Link to MATTER Glossary entry for pearlite, silicon Link to MATTER Glossary entry for silicon
Categories
Metal or alloy
System
Fe-C-X   Link to phase diagram
Composition
Fe, C 3.2, Si 2.5, Mg 0.05 (wt%)
Standard codes
Reaction
Processing
Heat treated
Applications
Sample preparation
Etchant: Nital 2%
Technique
Reflected light microscopy
Length bar
100 μm
Further information
Spheroidal graphite cast iron usually has a pearlitic matrix. However, annealing causes the carbon in the pearlite to precipitate on to the existing graphite or to form further small graphite particles, leaving behind a ferritic matrix. This gives the iron even greater ductility. The micrograph shows graphite nodules in a ferritic matrix.

Source: http://www.msm.cam.ac.uk/phase-trans/2001/adi/cast.iron.html.
Contributor
Dr M A Yescas-Gonzalez
Organisation
Department of Materials Science and Metallurgy, University of Cambridge
Date
18/07/03
Licence for re-use
DoITPoMS standard terms of use
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