Image icon  Cast iron with magnesium induced spheroidised graphite

 
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Description: Cast iron is a brittle material and it is advantageous to process it in such a way to improve its ductility. The brittleness is partially due to the graphite flakes which act as nucleation sites for cracks. Therefore it is an advantage to have the graphite present as spheres. This can be achieved by a heat treatment regime or by the addition of a small amount of Mg which poisons the graphite growth directions.
Keywords: alloy • carbon • cast iron • iron • metal • spheroidal
Categories: Science approaches > Microstructure
Materials > Metals & alloys > Cast irons
Materials > Metals & alloys > Magnesium & alloys
Processes > Shaping > Casting
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: 1455