Full Record for Micrograph 78
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- Micrograph no
- 78
- Brief description
- Forging steel, brittle, intergranular fracture
- Keywords
- alloy , brittle , carbon, fracture , intergranular , iron, metal, steel
- Categories
- Fracture, Metal or alloy
- System
- Fe-C-X
- Composition
- Forging steel
- Standard codes
- Reaction
- Processing
- Applications
- Sample preparation
- Technique
- Scanning electron microscopy (SEM)
- Length bar
- 800 μm
- Further information
- This steel has been given a welding type stress relief heat treatment which has resulted in the embrittlement of prior austenite grain boundaries due to the segregation of impurities to the boundaries (like P and Sn). The fracture path is now intergranular following the weakened grain boundaries. A similar fracture mechanism is observed with glassy phases and intergranular porosity in ceramics.
- 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