4.6 Article

Evolution of Annealing Twins in a Hot Deformed Nickel-Based Superalloy

Journal

MATERIALS
Volume 15, Issue 1, Pages -

Publisher

MDPI
DOI: 10.3390/ma15010007

Keywords

annealing twins; superalloy; hot deformation; dynamic recrystallization; grain boundary

Funding

  1. National Natural Science Foundation of China [51775564, 51905048]
  2. Graduate innovation research projects of Hunan Province, China [CX2018B038]
  3. Science and Technology Talent Promotion Project of Hunan Province [2020TJ-Q05]
  4. Natural Science Foundation of Hunan Province, China [2021JJ30725]
  5. general project of Education Department of Hunan Province, China [19C0078]

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The hot deformation characteristics of GH4169 superalloy were investigated, and the effects of deformation parameters on flow curves and annealing twins were discussed. It was found that the deformation temperature greatly affected the shapes of flow curves, and the evolution of annealing twins was sensitive to deformation degree, temperature, and strain rate.
The hot deformation characteristics of a GH4169 superalloy are investigated at the temperature and strain rate ranges of 1193-1313 K and 0.01-1 s(-1), respectively, through Gleeble-3500 simulator. The hot deformed microstructures are analyzed by optical microscopy (OM), transmission electron microscopy (TEM), and electron backscattered diffraction (EBSD) technology. The effects of deformation parameters on the features of flow curves and annealing twins are discussed in detail. It is found that the shapes of flow curves are greatly affected by the deformation temperature. Broad peaks appear at low deformation temperatures or high strain rates. In addition, the evolution of annealing twins is significantly sensitive to the deformation degree, temperature, and strain rate. The fraction of annealing twins first decreases and then rises with the added deformation degree. This is because the initial annealing twin characters disappear at the relatively small strains, while the annealing twins rapidly generate with the growth of dynamic recrystallized grains during the subsequent hot deformation. The fraction of annealing twins is relatively high when the deformation temperature is high or the strain rate is low. In addition, the important role of annealing twins on dynamic recrystallization (DRX) behaviors are elucidated. The obvious bulging at initial twin boundaries, and the coherency of annealing twin boundaries with dynamic recrystallized grain boundaries, indicates that annealing twins can motivate the DRX nucleation during the hot deformation.

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