DoITPoMS

Full Record for Micrograph 21

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Micrograph no
21
Brief description
Fe, C 1.0 (wt%), hypereutectoid alloy
Keywords
alloy Link to MATTER Glossary entry for alloy, carbon, cementite Link to MATTER Glossary entry for cementite, hypereutectoid Link to MATTER Glossary entry for hypereutectoid, iron, metal, steel Link to MATTER Glossary entry for steel, Widmanstätten Link to MATTER Glossary entry for Widmanstätten
Categories
Metal or alloy
System
Fe-C-X   Link to phase diagram
Composition
Fe, C 1.0 (wt%)
Standard codes
Reaction
Processing
Normalised
Applications
Sample preparation
Etched in 3% nital
Technique
Reflected light microscopy
Length bar
400 μm
Further information
This is a hypereutectoid alloy and illustrates the effect of a fast cooling rate on the resultant microstructure. The first phase to form from the austenite is proeutectoid cementite. With faster cooling there is less time for carbon to diffuse and the microstructure is more refined and may form the initial cementite as Widmanstätten side plates.
Contributor
Prof T W Clyne
Organisation
Department of Materials Science and Metallurgy, University of Cambridge
Date
25/10/01
Licence for re-use
Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales
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