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<p>This study examines the effects of three distinct heat treatment processes on the high-cycle fatigue performance of HT700R iron-nickel-based superalloy at 650°C. Microstructural characterization and analysis of fatigue fracture surfaces were conducted using optical microscopy (OM), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD). The mechanisms governing high-cycle fatigue failure and the associated influencing factors were systematically analyzed. The results indicate that, under fatigue test conditions of 650℃ and 240&#xa0;MPa, the specimens with fine grains and large-sized γ'&#xa0;phases among the three groups exhibit the longest fatigue life. During cyclic loading, dynamic recrystallization was observed within the alloy, resulting in grain refinement. Examination of the fatigue fracture surfaces revealed that cracks originated near the surface of all samples. In the crack propagation region, numerous fatigue striations were present, indicating a mixed transgranular and intergranular fracture mode.</p>

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Study on high-cycle fatigue properties of HT700R iron-nickel-based superalloy at high temperatures

  • 期刊论文

  • 发表日期：

    2025年8月13日

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  • Pei Li,
  • Dawei Yi,
  • Jingbo Yan,
  • Yihang He,
  • Jing Huang,
  • Chenxi Tang,
  • Linhao Huang,
  • Zheng Yang

摘要

This study examines the effects of three distinct heat treatment processes on the high-cycle fatigue performance of HT700R iron-nickel-based superalloy at 650°C. Microstructural characterization and analysis of fatigue fracture surfaces were conducted using optical microscopy (OM), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD). The mechanisms governing high-cycle fatigue failure and the associated influencing factors were systematically analyzed. The results indicate that, under fatigue test conditions of 650℃ and 240 MPa, the specimens with fine grains and large-sized γ' phases among the three groups exhibit the longest fatigue life. During cyclic loading, dynamic recrystallization was observed within the alloy, resulting in grain refinement. Examination of the fatigue fracture surfaces revealed that cracks originated near the surface of all samples. In the crack propagation region, numerous fatigue striations were present, indicating a mixed transgranular and intergranular fracture mode.