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Micrograph 781 and full record
- Micrograph no
- 781
- Brief description
- Heat treated spheroidal graphite cast iron
- Keywords
- alloy
, annealing , carbon, cast iron , decarburisation , ductile , ferrite , graphite , grey cast iron , heat treatment , iron, magnesium, metal, pearlite , silicon - Categories
- Metal or alloy
- System
- Fe-C-X
- 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
- 50 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. Some carbon deposited during tempering is also visible.
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- Related micrographs
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