Image icon  Austenitic stainless steel

 
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Description: This is a transmission electron micrograph taken at 200 kV, from a thin foil sample of "302AA" austenitic stainless steel. The sample was cold-deformed by rolling and then annealed at 704 °C for one hour. The image shows recrystallised grains which which show uniform contrast because they are relatively free of dislocations, surrounded by a deformed matrix which has a high dislocation density. The recrystallised grain contains annealing twins (parallel bands with different contrast. The steps at the top left-hand corner are simply steps in annealing twin boundaries.

Source: http://www.msm.cam.ac.uk/phase-trans/abstracts/annealing.twin.html.
Keywords: alloy • annealing twins • austenite • carbon • dislocation • grain • iron • metal • recrystallisation • stainless steel • steel
Categories: Science approaches > Structure, bonding & defects > Dislocations
Science approaches > Structure, bonding & defects > Twins
Science approaches > Microstructure
Science approaches > Strengthening mechanisms > Recovery, recrystallisation & grain growth
Materials > Metals & alloys > Stainless steels
Processes > Thermal treatments > Annealing
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: Prof H K D H Bhadeshia, Department of Materials Science and Metallurgy, University of Cambridge
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: 18 July 2003
Date added: 21 August 2009
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Resource ID: 1802