Effect of Temperature and Strain Rate on the Workability of Spray Formed FGH4095 Superalloy in Hot Deformation
Jump To References Section
DOI:
https://doi.org/10.18311/jmmf/2017/27007Keywords:
Strain Rate, Spray Forming, Nickel Based Superalloy, Hot Deformation.Abstract
The hot com pression testing of hot isostatically p ressed (HIPed) spray formed (SF) nickel-base superalloy was carried out in the temperature range o f 1050-1150°C at strain rates of O.OOl-lOs-land engineering strain of 10-70% using G leeble-1500 therm al simulator. Transmission electron m icroscope (TEM) and electron backscatter diffraction (EBSD) technique were used to study the effect of strain rate on the m icro structure evolution of the alloy during hot deformation. The true stress-true strain flow curve shows that the flow stress decreases w ith increasing deform ation tem perature and decreasing strain rate. M icrostructure observations reveal that the dynamic recrystallization (DRX) process was stimulated at high strain rates (ε> 1 s - 1) due to the high dislocation density and adiabatic temperature rise. High deform ation tem perature a nd strain rate is conducive to the occurrence of dynamic recrystallization. M eanwhile, particular attention was also paid to the evolution of twin boundaries during hot deformation. It was fou n d that there was a lower fraction of S3 boundaries at the intermediate strain rate of 1 s-1, while the fractions of S3 boundaries were much higher at both the lower strain rates (ε < 0.1 s ” l) and higher strain rates (ε > 4 s ” l ) . During the transformation process, the dislocations inside the subgrains and around the subgrain boundaries were annihilated by dislocation reaction and absorption.Downloads
Download data is not yet available.
Metrics
Metrics Loading ...
Downloads
Published
2017-05-01
How to Cite
Wu, H.-X., Xia, M., Yan, Q.- zhi, Tian, T., Hu, Q.- peng, & Ge, C.-C. (2017). Effect of Temperature and Strain Rate on the Workability of Spray Formed FGH4095 Superalloy in Hot Deformation. Journal of Mines, Metals and Fuels, 65(5), 283–290. https://doi.org/10.18311/jmmf/2017/27007
Issue
Section
Articles