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Full Record for Micrograph 387
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- Micrograph no
- 387
- Brief description
- Silal
- Keywords
- alloy
, carbon, grey cast iron , iron, metal, silal - Categories
- Metal or alloy
- System
- Fe-C-X
- Composition
- Fe, C 2.10, Si 5.60, Mn 0.50 (wt%) (Silal)
- Standard codes
- Reaction
- Processing
- Sand cast
- Applications
- Sample preparation
- Nital
- Technique
- Reflected light microscopy
- Length bar
- 400 μm
- Further information
- This sample shows the typical structure of silal, irons with high Si content (5.5-7.9 wt%). It is a grey cast iron alloyed with 4-6wt% Si to provide good oxidation resistance. The high Si content forms a dense, adherent iron silicate surface film, which is resistant to oxygen penetration. The flake graphite iron Silal was one of the first heat resisting cast irons developed. Spheroidal graphite Si irons have higher strength and improved ductility. The structure shows cored dendrites of ferrite with interdendritic flake graphite. A few white areas of Si carbide are also present.
- Contributor
- Dr R F Cochrane
- Organisation
- Department of Materials, University of Leeds
- Date
- 04/09/02
- Licence for re-use
Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales- Related micrographs