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Full Record for Micrograph 368
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- Micrograph no
- 368
- Brief description
- Blackheart cast iron
- Keywords
- alloy
, carbon, iron, metal, white cast iron - Categories
- Metal or alloy
- System
- Fe-C-X
- Composition
- Fe, C 2.4, Si 1.1, Mn 1.1 (wt%)
- Standard codes
- Reaction
- Processing
- as cast
- Applications
- Sample preparation
- Nital
- Technique
- Reflected light microscopy
- Length bar
- 400 μm
- Further information
- Blackheart cast iron is produced by heating white cast iron at 900-950 ºC for many days before cooling slowly. This results in a microstructure containing irregular though equiaxed nodules of graphite in a ferritic matrix. The term "blackheart" comes from the fact that the fracture surface has a grey or black appearance due to the presence of graphite at the surface. The purpose of the heat treatment is to increase the ductility of the cast iron.
- Contributor
- Dr R F Cochrane
- Organisation
- Department of Materials, University of Leeds
- Date
- 04/09/02
- Licence for re-use
Attribution-NonCommercial-ShareAlike 4.0 International- Related micrographs