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DoITPoMS Micrograph Library Full Record for Micrograph 739
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Full Record for Micrograph 739

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Micrograph no
739
Brief description
TRIP steel annealed at 775°C for 5 mins and then hold at 400°C for 150s for austenite stabilization
Keywords
alloy Link to MATTER Glossary entry for alloy, bainite Link to MATTER Glossary entry for bainite, metal, retained austenite, TRIP steel
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
The steel was annealed at 775°C for 5mins and then isothermally held at 400°C for 150 s.
Applications
Sample preparation
The sample was etched using the two-stage step etching technique.
Technique
Reflected light microscopy
Length bar
6 μm
Further information
The steel microstructure reveals clearly the retained austenite as white, martensite as straw-coloured constituents, bainite can be identified with needle-shaped austenites (there is no carbide present due to the addition of Si). Many martensite-austenite constituents can be found in the microstructure which is revealed because of the tint etching. This is not possible with any other reported ethants/etching techniques for TRIP steels. The microstructure does not show presence of any carbides.
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-NonCommercial-ShareAlike 4.0 International
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