Micrograph 736 and full record
- Micrograph no
- 736
- Brief description
- Dual-phase steel water quenched from 775°C
- Keywords
- alloy , dual-phase steel, metal
- Categories
- Metal or alloy
- System
- Fe-C-X
- 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-NonCommercial-ShareAlike 4.0 International
- Related micrographs
- Micrograph 735: Dual-phase steel water quenched from 750°C (6 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)
- Micrograph 740: TRIP steel annealed at 775°C for 5 mins and then hold at 400°C for 40s for austenite stabilization (20 μm)
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