Dissemination of IT for the Promotion of Materials Science (DoITPoMS)

DoITPoMS Micrograph Library Full Record for Micrograph 27

Full Record for Micrograph 27

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Micrograph no
27
Brief description
Fe, C 0.9 (wt%), martensite
Keywords
alloy Link to MATTER Glossary entry for alloy, carbon, iron, martensite Link to MATTER Glossary entry for martensite, metal, metastable Link to MATTER Glossary entry for metastable, steel Link to MATTER Glossary entry for steel
Categories
Metal or alloy
System
Fe-C-X   Link to phase diagram
Composition
Fe, C 0.9 (wt%)
Standard codes
Reaction
Processing
Water quenched from 800 °C
Applications
Sample preparation
Etched in 3% nital
Technique
Reflected light microscopy
Length bar
40 μm
Further information
Martensite is a metastable supersaturated solid solution of C in steel. The excess carbon atoms sufficiently strain the matrix to produce a b.c.t (body centred tetragonal) structure. In order to minimise interfacial strain between the parent austenite and the transforming martensite the martensites assume a lath or needle shape.
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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