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<p>In order to explore the rejuvenation processes and restoration mechanisms of a directionally solidified superalloy applied in industrial gas turbine blades, three rejuvenation treatment regimes, combined with hot isostatic pressing (HIP), were conducted to rejuvenate the damaged microstructure and extend creep life under low temperature/high stress and high temperature/low stress. After only applying a solution rejuvenation treatment, recrystallization occurred and failed to restore creep life at low temperature/high stress (750&#xa0;°C/610&#xa0;MPa). The introduction of HIP fulfilled multiple roles: (i) effective pore closure to delay failure; (ii) significant suppression of recrystallization through annihilation and rearrangement of dislocations; (iii) improvement of the adequacy and reliability for high temperature homogenization based on the suppression of recrystallization. An optimized rejuvenation treatment combining HIP with elevated solution temperatures was developed, achieving superior recovery efficiencies of 87.1 and 104.7 pct in creep life under 750&#xa0;°C/610&#xa0;MPa and 900&#xa0;°C/190&#xa0;MPa conditions, respectively. These results reveal a strong temperature-stress dependence in rejuvenation efficacy, with superior restoration observed under high-temperature/low-stress conditions, offering practical guidance for service-life extension of blades.</p>

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Recovery of Creep Performance at Different Temperature and Stress Levels of a Directionally Solidified Ni-Based Superalloy by Hot Isostatic Pressing and Rejuvenation Heat Treatments

  • 期刊论文

  • 发表日期：

    2025年6月24日

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  • Zishu Sun,
  • Xiangwei Jiang,
  • Jiasheng Dong,
  • Xin Zhan,
  • Li Wang,
  • Di Wang,
  • Zhengguo Xu,
  • Kaiwen Li,
  • Mingsheng Wang,
  • Langhong Lou

摘要

In order to explore the rejuvenation processes and restoration mechanisms of a directionally solidified superalloy applied in industrial gas turbine blades, three rejuvenation treatment regimes, combined with hot isostatic pressing (HIP), were conducted to rejuvenate the damaged microstructure and extend creep life under low temperature/high stress and high temperature/low stress. After only applying a solution rejuvenation treatment, recrystallization occurred and failed to restore creep life at low temperature/high stress (750 °C/610 MPa). The introduction of HIP fulfilled multiple roles: (i) effective pore closure to delay failure; (ii) significant suppression of recrystallization through annihilation and rearrangement of dislocations; (iii) improvement of the adequacy and reliability for high temperature homogenization based on the suppression of recrystallization. An optimized rejuvenation treatment combining HIP with elevated solution temperatures was developed, achieving superior recovery efficiencies of 87.1 and 104.7 pct in creep life under 750 °C/610 MPa and 900 °C/190 MPa conditions, respectively. These results reveal a strong temperature-stress dependence in rejuvenation efficacy, with superior restoration observed under high-temperature/low-stress conditions, offering practical guidance for service-life extension of blades.