Abstract
An investigation into the effect of temperature and strain gradients on recrystallization during solution heat treatment has been performed on Alloy 718 test pieces. High temperature compression experiments were carried out using a Gleeble, which generates strain and temperature gradients within the compression sample. The initial results have shown there is a band in the deformation transition zone where large abnormally coarse grains manifest after solution heat treatment. Detailed analysis by Electron Backscatter Diffraction (EBSD) was carried out to determine grain characteristics as well as δ phase distribution and morphology. Grains produced via this abnormal grain coarsening are characterised by a large percentage of twin boundaries. The grain growth also appears to be immune to the effects of boundary pinning by δ phase particles. The results suggest that stored energy gradients may be the key to this phenomenon.
Original language | English |
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Title of host publication | 8th International Symposium on Superalloy 718 and Derivatives 2014 |
Editors | Eric Ott, Anthony Banik, Joel Andersson, Ian Dempster, Tim Gabb, Jon Groh, Karl Heck, Randy Helmink, Xingbo Liu, Agnieszka Wusatowska-Sarnek |
Publisher | John Wiley & Sons |
Pages | 873-884 |
Number of pages | 12 |
ISBN (Electronic) | 9781634396424 |
DOIs | |
Publication status | Published - 2014 |
Externally published | Yes |
Event | International Symposium on Superalloy 718 and Derivatives 2014 - Pittsburgh, United States of America Duration: 28 Sept 2014 → 1 Oct 2014 Conference number: 8th |
Publication series
Name | 8th International Symposium on Superalloy 718 and Derivatives 2014 |
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Conference
Conference | International Symposium on Superalloy 718 and Derivatives 2014 |
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Country/Territory | United States of America |
City | Pittsburgh |
Period | 28/09/14 → 1/10/14 |
Keywords
- EBSD
- Microstructure Evaluation
- Recrystallization
- Thermomechanical processing