Abstract
Interrupted cooling tests have been carried out in order to study the microstructural evolution of a high γ´ fraction nickel-based superalloy during continuous cooling from above γ´ solvus. It was found that the formation of irregular-shaped γ΄ during slow cooling is the result of coarsening and coalescing of γ΄ precipitates which involved dissolution of adjacent even finer precipitates and solute flux from them. The formation of serrated grain boundaries was found to be associated with the presence of large γ´ precipitates at the grain boundaries which may have pinned grain boundaries during their migration.
| Original language | English |
|---|---|
| Pages (from-to) | 28-34 |
| Number of pages | 7 |
| Journal | Materials Characterization |
| Volume | 76 |
| Early online date | 5 Dec 2012 |
| DOIs | |
| Publication status | Published - Feb 2013 |
Keywords
- Nickel-based superalloy
- gamma prime
- continuous cooling
- microstructural evolution
- serrated grain boundaries