Image icon  Fe, C 0.8 (wt%) steel, eutectoid transformation, spheroidised

 
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Description: 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 (γ to α + 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, compared with the normal plate-like appearance in freshly-formed pearlite, are clearly visible in this micrograph.
Keywords: alloy • carbon • iron • metal • normalising • spheroidised • steel
Categories: Science approaches > Microstructure
Materials > Metals & alloys > Carbon steels
Processes > Thermal treatments > Annealing
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: Dr R F Cochrane, Department of Materials, University of Leeds
DoITPoMS, University of Cambridge
Published by: DoITPoMS, University of Cambridge
License: This resource is released under the Creative Commons Attribution Non-Commercial Share Alike license (2.0 UK: England & Wales).
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Date created: 04 September 2002
Date added: 21 August 2009
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Resource ID: 1304