![]() |
|
Use this resource: |
![]() |
Link to this page: | http://core.materials.ac.uk/search/detail.php?id=1326 |
---|
View at: | ![]() ![]() ![]() |
---|---|
Resource type: | Image |
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: |
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). View the full legal code here. |
Date created: | 04 September 2002 |
Date added: | 21 August 2009 |
Package: | |
Resource ID: | 1326 |