Journal
MATERIALS & DESIGN
Volume 80, Issue -, Pages 51-62Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2015.05.004
Keywords
Nickel-based superalloy; DRX; Dislocation density; Adiabatic temperature rise; Twinning
Categories
Funding
- National Natural Science Foundation of China [51205081]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1229]
Ask authors/readers for more resources
The hot deformation behavior of a nickel-based superalloy was investigated by means of isothermal compression tests in the strain rate range of 0.001-10 s (1) at 1110 degrees C. Transmission electron microscope (TEM) and electron backscatter diffraction (EBSD) technique were used to study the effect of strain rate on the microstructure evolution of the alloy during hot deformation. The results revealed that the dynamic recrystallization (DRX) process was stimulated at high strain rates ((epsilon)over dot >= 5 s(-1)) due to the high dislocation density and adiabatic temperature rise. Meanwhile, high nucleation of DRX and low grain growth led to the fine DRX grains. In the strain rate rage of 0.001-1 s (1), the volume fraction of DRX grains increased with the decreasing strain rate, and the grain growth gradually governed the DRX process. Moreover, the strain rate has an important effect on DDRX and CDRX during hot deformation. On the other hand, particular attention was also paid to the evolution of twin boundaries during hot deformation. It was found that there was a lower fraction of Sigma 3 boundaries at the intermediate strain rate of 1 s (1), while the fractions of Sigma 3 boundaries were much higher at both the lower strain rates ((epsilon)over dot <= 0.1 s(-1)) and higher strain rates ((epsilon)over dot >= s(-1)). (C) 2015 Elsevier Ltd. All rights reserved.
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