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Superplastic Deformation and Dynamic Recrystallization of a Novel Disc Superalloy GH4151

1
Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
2
Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100094, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(22), 3667; https://doi.org/10.3390/ma12223667
Received: 12 October 2019 / Revised: 29 October 2019 / Accepted: 5 November 2019 / Published: 7 November 2019
The superplastic deformation of a hot-extruded GH4151 billet was investigated by means of tensile tests with the strain rates of 10−4 s−1, 5 × 10−4 s−1 and 10−3 s−1 and at temperatures at 1060 °C, 1080 °C and 1100 °C. The superplastic deformation of the GH4151 alloy was reported here for the first time. The results reveal that the uniform fine-grained GH4151 alloy exhibited an excellent superplasticity and high strain rate sensitivity (exceeded 0.5) under all experimental conditions. It was found that the increase of strain rate resulted in an increased average activation energy for superplastic deformation. A maximum elongation of 760.4% was determined at a temperature of 1080 °C and strain rate of 10−3 s−1. The average activation energy under different conditions suggested that the superplastic deformation with 1 × 10−4 s−1 in this experiment is mainly deemed as the grain boundary sliding controlled by grain boundary diffusion. However, with a higher stain rate of 5 × 10−4 s−1 and 1 × 10−3 s−1, the superplastic deformation is considered to be grain boundary sliding controlled by lattice diffusion. Based on the systematically microstructural examination using optical microscope (OM), SEM, electron backscatter diffraction (EBSD) and TEM techniques, the failure and dynamic recrystallization (DRX) nucleation mechanisms were proposed. The dominant nucleation mechanism of dynamic recrystallization (DRX) is the bulging of original grain boundaries, which is the typical feature of discontinuous dynamic recrystallization (DDRX), and continuous dynamic recrystallization (CDRX) is merely an assistant mechanism of DRX. The main contributions of DRX on superplasticity elongation were derived from its grain refinement process. View Full-Text
Keywords: GH4151 alloy; superplastic deformation; activation energy; dynamic recrystallization GH4151 alloy; superplastic deformation; activation energy; dynamic recrystallization
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MDPI and ACS Style

Lv, S.; Jia, C.; He, X.; Wan, Z.; Li, X.; Qu, X. Superplastic Deformation and Dynamic Recrystallization of a Novel Disc Superalloy GH4151. Materials 2019, 12, 3667.

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