Influence of deformation temperature on recrystallization in a Ni-based single crystal superalloy

• Deformation temperature has a great influence on RX sensitivity.
• Stacking faults can facilitate the RX nucleation.
• Samples deformed at around 980 °C have the highest propensity for recrystallization.
• Low misorientations are induced in deformed samples, even at elevated deformation temperatures.

The influence of deformation temperatures on recrystallization in a Ni-based single-crystal superalloy was investigated. Electron back-scattered diffraction (EBSD) was used to determine if recrystallization could occur. The deformation dislocation microstructure was examined by transmission electron microscopy (TEM). Critical annealing temperatures for recrystallization of compressed samples with around 5% plastic strains were determined. The results indicated that deformation temperature had an important influence on the recrystallization behavior. Samples deformed at around 980 °C have the highest propensity for recrystallization. The recrystallization nucleation mechanism in this alloy was discussed. Low misorientations are induced in deformed samples, even at elevated deformation temperatures. Annealing twinning through stacking faults plays a significant role in recrystallization at low plastic strains.

Figure optionsDownload as PowerPoint slide