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<p>Through investigating the low-cycle fatigue behavior and damage mechanism of the GH4169 superalloy at elevated temperature, a continuous cyclic softening response can be observed. Failure analysis indicated that the crack initiation sites on sample surfaces had a considerable difference due to the different types of inclusions. Moreover, the crack propagation is jointly influenced by slip bands and inclusions. Based on the growth evolution of microcracks, a damage concept process for causing the fatigue failure of the GH4169 superalloy was proposed.</p>

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Microcrack Evolution of Ni-Based Superalloy GH4169 under Low-Cycle Fatigue Loading Condition at 650 °C

  • 期刊论文

  • 发表日期：

    2026年1月22日

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  • Lei Wang,
  • Xiang Zhao,
  • Yanming Liu,
  • Taolei Wang,
  • Fangjuan Qi

摘要

Through investigating the low-cycle fatigue behavior and damage mechanism of the GH4169 superalloy at elevated temperature, a continuous cyclic softening response can be observed. Failure analysis indicated that the crack initiation sites on sample surfaces had a considerable difference due to the different types of inclusions. Moreover, the crack propagation is jointly influenced by slip bands and inclusions. Based on the growth evolution of microcracks, a damage concept process for causing the fatigue failure of the GH4169 superalloy was proposed.