Effect of Temperature and Strain Rate on the Workability of Spray Formed FGH4095 Superalloy in Hot Deformation

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Authors

  • University of Science and Technology Beijing, Beijing 100 083 ,CN
  • University of Science and Technology Beijing, Beijing 100 083 ,CN
  • University of Science and Technology Beijing, Beijing 100 083 ,CN
  • University of Science and Technology Beijing, Beijing 100 083 ,CN
  • University of Science and Technology Beijing, Beijing 100 083 ,CN
  • University of Science and Technology Beijing, Beijing 100 083 ,CN

DOI:

https://doi.org/10.18311/jmmf/2017/27007

Keywords:

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.

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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

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