Micrograph Library
Browse the libraryAdvanced searchSystemsCompositionsTechniquesKeywordsPhase diagramsHelpPreferencesAbout the micrograph libraryTerms of useContribute micrographs!FeedbackLinksCredits Print this page
Full Record for Micrograph 265
[233 KB]
View micrograph
.. in new window
View micrograph and record
.. in new window
You can also view and download the micrographs on Flickr
- Micrograph no
- 265
- 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 cannot be seen clearly in this micrograph, but they are discernible at higher magnification (see micrographs 266 and 267).
- 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