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Micrograph 340 and full record
- Micrograph no
- 340
- Brief description
- Low alloy medium carbon steel, containing Ni, Cr, Mo, annealed
- Keywords
- alloy
, carbon, iron, metal, steel - Categories
- Metal or alloy
- System
- Fe-C-X
- Composition
- Fe, C 0.31, Ni 3.0, Cr 0.9, Mn 0.6 (wt%)
- Standard codes
- BS 653M31, formerly En 23
- Reaction
- Processing
- Annealed
- Applications
- Sample preparation
- Nital
- Technique
- Reflected light microscopy
- Length bar
- 400 μm
- Further information
- Medium carbon steel with a microstructure consisting mostly of ferrite with the darker pearlite regions around the ferrite grains. Upon cooling the steel the ferrite forms initially, either on austenite grain boundaries or inclusions. This causes carbon to be partitioned into the austenite. Eventually the remaining austenite will be at the eutectoid condition and the transformation to pearlite will then take place. The ferrite is idiomorphic since carbide formers are present, providing nucleation sites.
- Contributor
- Dr R F Cochrane
- Organisation
- Department of Materials, University of Leeds
- Date
- 04/09/02
- Licence for re-use
Attribution-NonCommercial-ShareAlike 4.0 International- Related micrographs
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