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An Annealing Strategy for Inhibiting Recrystallization in Nickel-Based Single-Crystal Superalloys.

Xing Hu1, Fuze Xu2,3, Menglin Gao1

  • 1Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.

Materials (Basel, Switzerland)
|July 30, 2025
PubMed
Summary

Inhibiting recrystallization in single-crystal superalloys is key for turbine blades. A 1000 °C recovery anneal effectively prevents recrystallization by minimizing geometrically necessary dislocations (GNDs).

Keywords:
annealingmicrostructurerecrystallizationsingle-crystal superalloy

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Area of Science:

  • Materials Science
  • Metallurgy
  • Mechanical Engineering

Background:

  • Recrystallization inhibition is crucial for high-strain nickel-based single-crystal superalloys in advanced turbine blade applications.
  • Understanding the evolution of the primary gamma prime (γ') phase and dislocations during annealing is essential for controlling material properties.

Purpose of the Study:

  • To investigate the annealing behavior of the primary γ' phase and dislocations in a third-generation Re-containing single-crystal superalloy (WZ30) after compressive deformation.
  • To identify optimal annealing conditions for inhibiting recrystallization in these advanced superalloys.

Main Methods:

  • Subjecting WZ30 superalloy to 5% compressive deformation.
  • Performing isochronal annealing from 700 to 1200 °C for 1 minute.
  • Utilizing scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) for microstructural analysis.
  • Conducting prolonged recovery annealing at 1000 °C for 10 hours.

Main Results:

  • Observed a nonlinear variation in geometrically necessary dislocation (GND) density with annealing temperature.
  • Identified a minimum GND density at 1000 °C, retaining 62.7% of the primary γ' phase.
  • Demonstrated that prolonged recovery annealing at 1000 °C effectively inhibited recrystallization during subsequent solution heat treatment.

Conclusions:

  • A specific annealing strategy involving prolonged recovery at 1000 °C can effectively suppress recrystallization in single-crystal superalloys.
  • This approach offers a practical method to enhance the high-temperature performance and durability of turbine blades.