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Full Record for Micrograph 266
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- Micrograph no
- 266
- Brief description
- Fe, C 0.8 (wt%) steel, eutectoid transformation, spheroidised
- Keywords
- alloy
, carbon, iron, metal, normalising , spheroidised, steel - Categories
- Metal or alloy
- System
- Fe-C-X
- Composition
- Fe, C 0.8 (wt%)
- Standard codes
- Reaction
- Processing
- Spheroidised
- Applications
- Sample preparation
- Nital
- Technique
- Reflected light microscopy
- Length bar
- 400 μm
- Further information
- This steel is of the eutectoid composition. Once the temperature is lowered below the eutectoid temperature, the austenite phase tends to undergo a eutectoid transformation (g to a + Fe3C). The resultant microstructure, known as pearlite, comprises alternate lamellae of cementite and ferrite. Subsequent to casting, the alloy was normalised (annealed) just below the eutectoid temperature, in order to induce the carbides to take a spherical appearance, which results in the steel becoming softer and more ductile. This is known as spheroidisation. The changes to the morphology of the cementite are visible in this micrograph, but are clearer at higher magnification (see micrograph 267).
- 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