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The mortise simulated specimens of a gas turbine disc were designed to assess the impact of stress gradient at the notch root on fatigue life. The stress gradient within the critical distance l0 of the simulated specimens is basically consistent with that of the real turbine disc. Fatigue tests were carried out at 420 and 600 ℃ on both smooth specimens and mortise simulated specimens. The fatigue test results of smooth specimens show that the S–N curve at 600 ℃ is above the S–N curve at 420 ℃, indicating superior fatigue performance at 600 °C compared to 420 °C. Microstructural analysis reveals that dynamic recrystallization of FGH95 at 600 °C results in finer crystals, thereby enhancing fatigue performance. A modification to the theory of critical distance is proposed to predict the fatigue life of simulated specimens. The test results show that the predicted life of the simulated specimens falls within the 2-time scatter band.

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Research on Simulated Specimen of FGH95 Gas Turbine Disc and Fatigue Life Prediction Method

  • 会议论文

  • 发表日期：

    2025年

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  • Peng Luo,
  • Songlin Peng,
  • Ming Yu,
  • Xing Ai

摘要

The mortise simulated specimens of a gas turbine disc were designed to assess the impact of stress gradient at the notch root on fatigue life. The stress gradient within the critical distance l0 of the simulated specimens is basically consistent with that of the real turbine disc. Fatigue tests were carried out at 420 and 600 ℃ on both smooth specimens and mortise simulated specimens. The fatigue test results of smooth specimens show that the S–N curve at 600 ℃ is above the S–N curve at 420 ℃, indicating superior fatigue performance at 600 °C compared to 420 °C. Microstructural analysis reveals that dynamic recrystallization of FGH95 at 600 °C results in finer crystals, thereby enhancing fatigue performance. A modification to the theory of critical distance is proposed to predict the fatigue life of simulated specimens. The test results show that the predicted life of the simulated specimens falls within the 2-time scatter band.