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

DoITPoMS Micrograph Library Full Record for Micrograph 736

Full Record for Micrograph 736

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Micrograph no
736
Brief description
Dual-phase steel water quenched from 775°C
Keywords
alloy Link to MATTER Glossary entry for alloy, dual-phase steel, metal
Categories
Metal or alloy
System
Fe-C-X   Link to phase diagram
Composition
Fe, C 0.15, Mn 1.5, Si 1.5 (wt%)
Standard codes
Reaction
Processing
Annealed at 775°C for 5 mins and then water quenched to temperature.
Applications
Sample preparation
Sample mounted in bakelite and observed along the sample rolling direction. Etched first with 4% Picral and then with 10% aqueous sodium metabisulfite solution.
Technique
Reflected light microscopy
Length bar
5 μm
Further information
Same steel when quenched from 775°C. Carbides cannot be seen anymore. The microstructure is essentially martensite and ferrite. Some retained austenite can be seen as white small particles which are brighter than the background ferrite. Retained austenite measured using XRD was 3%. The step-etching technique has resulted in straw-coloured martensite, white austenite and the off-white ferrite at the background.
Contributor
Dr Amar K De
Organisation
ASPPRC, Metallurgical and Materials Engineering Department, Colorado School of Mines
Date
22/04/03
Licence for re-use
Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales
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