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Micrograph 740 and full record
- Micrograph no
- 740
- Brief description
- TRIP steel annealed at 775°C for 5 mins and then hold at 400°C for 40s 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 and then hold at the intermediate bainitic holding temperature of 400°C for only 40 s and then water quenched.
- Applications
- Sample preparation
- The sample was etched using the two-stage step etching technique.
- Technique
- Reflected light microscopy
- Length bar
- 20 μm
- Further information
- The microstructure shows martensite (straw-coloured), retained austenite (white) and some M-A constituents. Martensite volume fraction is higher than the steel which was hold for 150s at 400°C and cooled. Since the austenite is low in C-content for such a low holding time at 400°C, most of the austenite is transformed to martensite during cooling from 400°C to room temperature.
- 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- 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 739: TRIP steel annealed at 775°C for 5 mins and then hold at 400°C for 150s for austenite stabilization (6 μm)
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