Micrograph 275 and full record
- Micrograph no
- 275
- Brief description
- Fe, C 0.07, Mn 2.3 (wt%) steel, carburised at 950°C
- Keywords
- alloy , carbon, carburisation , iron, metal, steel
- Categories
- Metal or alloy
- System
- Fe-C-X
- Composition
- Fe, C 0.07, Mn 2.2 (wt%)
- Standard codes
- BS 220M07, formerly En 1A
- Reaction
- Processing
- carburised 950°C
- Applications
- Sample preparation
- Nital
- Technique
- Reflected light microscopy
- Length bar
- 400 μm
- Further information
- After initial casting of this steel it was subject to a process known as carburisation. The metal is heated to above the ferrite-austenite transition in a carbon atmosphere. This establishes a concentration gradient and hence carbon diffuses into the steel. Usually the steel is then hardened by quenching. This produces what is known as a case hardened steel - with a hard surface (case) surrounding a tough core. The carbon gradient can be seen in the changing shade of the sample from left to right, with high carbon concentration at the left (surface) and hence a martensitic phase, changing to the lighter shade consisting of mostly ferrite.
- 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
- Micrograph 271: Fe, C 0.07, Mn 2.3 (wt%) steel, carburised at 950°C (800 μm)
- Micrograph 272: Fe, C 0.07, Mn 2.3 (wt%) steel, carburised at 950°C (400 μm)
- Micrograph 273: Fe, C 0.07, Mn 2.3 (wt%) steel, carburised at 950°C (400 μm)
- Micrograph 274: Fe, C 0.07, Mn 2.3 (wt%) steel, carburised at 950°C (400 μm)
- Micrograph 276: Fe, C 0.07, Mn 2.3 (wt%) steel, carburised at 950°C (400 μm)
- Micrograph 277: Fe, C 0.07, Mn 2.3 (wt%) steel, carburised at 950°C (200 μm)
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