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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
, bainite
, metal, retained austenite, TRIP steel
- Categories
- Metal or alloy
- System
- Fe-C-X
- 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-Non-Commercial-Share Alike 2.0 UK: England & Wales
- Related micrographs
- Micrograph 735: Dual-phase steel water quenched from 750°C (6 μm)
- Micrograph 736: Dual-phase steel water quenched from 775°C (5 μm)
- Micrograph 737: Dual-phase steel water quenched from 800°C (6 μm)
- Micrograph 740: TRIP steel annealed at 775°C for 5 mins and then hold at 400°C for 40s for austenite stabilization (20 μm)