Micrograph 26 and full record
- Micrograph no
- 26
- Brief description
- Fe, C 0.85 (wt%), hypereutectoid alloy
- Keywords
- allotriomorph , alloy , carbon, cementite , hypereutectoid , iron, metal, steel
- Categories
- Metal or alloy
- System
- Fe-C-X
- Composition
- Fe, C 0.85 (wt%)
- Standard codes
- Reaction
- Processing
- Furnace cooled from 1000 °C
- Applications
- Sample preparation
- Etched in 2% nital
- Technique
- Reflected light microscopy
- Length bar
- 40 μm
- Further information
- This is a hypereutectoid alloy and illustrates the effect of slow cooling rate on the resultant microstructure. The first phase to form from the melt is proeutectoid cementite. With slow cooling, furnace cooled, allotriomorph cementite forms on the prior austenite grain boundaries, rejecting iron into the melt. At the eutectoid composition the remaining austenite transforms to pearlite.
- Contributor
- Prof T W Clyne
- Organisation
- Department of Materials Science and Metallurgy, University of Cambridge
- Date
- 25/10/01
- Licence for re-use
- Attribution-NonCommercial-ShareAlike 4.0 International
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