Journal
MATERIALS CHARACTERIZATION
Volume 139, Issue -, Pages 437-445Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2018.03.027
Keywords
Nickel-based superalloy; Hot forging; Electron backscatter diffraction; Grain structure; Recrystallization
Categories
Funding
- Advanced Forming Research Centre (AFRC) - UK's High Value Manufacturing CATAPULT
Ask authors/readers for more resources
Design and control of microstructure of engineering parts made from nickel based superalloys with superior mechanical properties for high temperature applications, require the parts to be subjected to certain thermo-mechanical processing during forging. This often includes sequential straining and annealing at elevated temperatures followed by subsequent aging heat treatments at lower temperatures. In this study, the effect of strain magnitude on the evolution of microstructure during hot forging of a recently developed AD730 nickel based superalloy has been investigated. Microstructural heterogeneity was observed in a forged material manifested in a form of large non-recrystallized grains within the recrystallized Matrix that is observed to be dependent on the level of deformation (i.e. strain magnitude). Analyses of microstructure indicated significant reduction in the fraction of low-angle grain boundaries and sub-structures with an increase in the applied strain, suggesting higher fraction of recrystallization with higher levels of strains. It was concluded that the lower strain levels were insufficient to provide enough driving force for complete recrystallization throughout the entire microstructure of the forged material.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available