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Full Record for Micrograph 340

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Micrograph no
340
Brief description
Low alloy medium carbon steel, containing Ni, Cr, Mo, annealed
Keywords
alloy Link to MATTER Glossary entry for alloy, carbon, iron, metal, steel Link to MATTER Glossary entry for steel
Categories
Metal or alloy
System
Fe-C-X   Link to phase diagram
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-Non-Commercial-Share Alike 2.0 UK: England & Wales
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