Ni基超合金の高温クリープ疲労負荷による初期粒界亀裂発生機構の定量評価

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  • 羅 軼凡
    東北大学大学院工学研究科ファインメカニクス専攻
  • 梁 言
    東北大学大学院工学研究科ファインメカニクス専攻
  • 鈴木 亘
    東北大学大学院工学研究科ファインメカニクス専攻
  • 鈴木 研
    東北大学大学院工学研究科附属先端材料強度科学研究センター
  • 三浦 英生
    東北大学大学院工学研究科附属先端材料強度科学研究センター

書誌事項

タイトル別名
  • Quantitative Evaluation of the initial intergranular Cracking of Ni-based Superalloys under Creep-fatigue loadings at Elevated Temperatures

抄録

<p>The effective lifetime of Ni-base alloy decreased drastically by the frequent change of the output of power plants to assure the stable power supply with various renewable energies. The conventional linear damage rule, however, can no longer explain the accelerated damage of Ni-base alloy under creep-fatigue loading. The main reason for the accelerated damage was the change of fracture mode from transgranular to intergranular. It was also found that the initial intergranular cracking under creep-fatigue loading always appeared at certain grain boundaries. Therefore, in this study, intermittent creep-fatigue test was applied to these two Ni-based alloys at 750oC and the change of their micro texture was continuously monitored by using FE-SEM (Field Emission-Scanning Electron Microscope) and EBSD (Electron Backscattered Diffraction) analysis. Eventually, two completely different degradation modes were found in the two Nick-based alloys, due to their different microstructure.</p>

収録刊行物

  • 年次大会

    年次大会 2020 (0), J03134-, 2020

    一般社団法人 日本機械学会

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