Image icon  Low alloy medium carbon steel, containing Ni, Cr, Mo, annealed

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Description: Medium carbon steel with a microstructure consisting mostly of ferrite with the darker pearlite regions around the ferrite grains. Upon cooling the steel the ferrite forms initially, either on austenite grain boundaries or inclusions. This causes carbon to be partitioned into the austenite. Eventually the remaining austenite will be at the eutectoid condition and the transformation to pearlite will then take place. The ferrite is idiomorphic since carbide formers are present, providing nucleation sites.
Keywords: alloy • carbon • iron • metal • steel
Categories: Science approaches > Microstructure
Materials > Metals & alloys > Carbon steels
Materials > Metals & alloys > Alloy 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
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Date created: 04 September 2002
Date added: 21 August 2009
Resource ID: 1378