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<p>In this paper, the creep–fatigue damage mechanism and life prediction of HT700R iron-nickel-based superalloy at 650&#xa0;°C were studied. Creep–fatigue tests were carried out under continuous cycling condition and tensile peak strain hold condition. The creep–fatigue life of the alloy under different hold times was predicted by using the linear cumulative damage model and high-temperature low-cycle fatigue (HLF) model. It is found that the creep–fatigue life of the material decreases significantly with the increase of strain amplitude and the extension of hold time. Under the same strain amplitude, a longer hold time results in shorter fatigue life but longer total loading duration. The linear cumulative damage model performs well under various hold time conditions, and the prediction results are within the ± 2&#xa0;N error band. However, the HLF model has a certain deviation under long hold time. Under the condition of this experiment, the creep–fatigue damage is mainly manifested as the linear accumulation of creep damage and fatigue damage.</p>

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Creep–Fatigue Damage Mechanism and Life Prediction of Iron-Nickel-Based HT700R Alloy

  • 期刊论文

  • 发表日期：

    2026年7月26日

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  • Miao Han,
  • Liang Sun,
  • Kaifa Fan,
  • Jingbo Yan,
  • Peng Liu,
  • Pei Li,
  • Pengfei Qu,
  • Linhao Huang,
  • Pei Li,
  • Chenxi Tang,
  • Yong Yuan

摘要

In this paper, the creep–fatigue damage mechanism and life prediction of HT700R iron-nickel-based superalloy at 650 °C were studied. Creep–fatigue tests were carried out under continuous cycling condition and tensile peak strain hold condition. The creep–fatigue life of the alloy under different hold times was predicted by using the linear cumulative damage model and high-temperature low-cycle fatigue (HLF) model. It is found that the creep–fatigue life of the material decreases significantly with the increase of strain amplitude and the extension of hold time. Under the same strain amplitude, a longer hold time results in shorter fatigue life but longer total loading duration. The linear cumulative damage model performs well under various hold time conditions, and the prediction results are within the ± 2 N error band. However, the HLF model has a certain deviation under long hold time. Under the condition of this experiment, the creep–fatigue damage is mainly manifested as the linear accumulation of creep damage and fatigue damage.