Fe, C 0.15 (wt%) steel, carburised

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Description:	After initial casting of this steel it was subject to a process known as carburisation. The metal is heated to above the ferrite-austenite transition in a carbon atmosphere. This establishes a concentration gradient and hence carbon diffuses into the steel. Usually the steel is then hardened by quenching. This produces what is known as a case hardened steel - with a hard surface (case) surrounding a tough core. The carbon gradient can be seen in the changing shade of the sample from left to right, with high carbon concentration at the right (surface) and hence a martensitic phase, changing to the lighter shade consisting of mostly ferrite.
Keywords:	alloy • carbon • carburisation • iron • metal • steel
Categories:	Science approaches > Microstructure Materials > Metals & alloys > Carbon steels Processes > Thermal treatments > Quenching Testing, analysis & experimentation > Metallography Scale > Micro
Created by:	DoITPoMS, University of Cambridge Dr R F Cochrane, Department of Materials, University of Leeds
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). You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work). noncommercial – You may not use this work for commercial purposes. share alike – If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one. View the full legal code here.
Date created:	04 September 2002
Date added:	21 August 2009
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Resource ID:	1326
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