高温クリープ疲労環境下におけるNi基超合金Alloy 625の粒界強度劣化機構の解明

  • 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
  • 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
  • Clarification of the Degradation Mechanism of the Strength of Grain Boundaries in Nickel-Based Alloy 625 Under Creep-Fatigue Loadings at Elevated Temperatures

抄録

<p>In order to reduce CO2 emissions and improve the efficiency of power generation, the steam temperature in A-USC (Advanced-Ultra Super Critical) is going to be elevated higher than 700oC. Therefore, Ni-base superalloy such as Alloy 625 has been chosen as a candidate material for components such as pressure vessels, pipes, and turbine blades in A-USC power plants due to its superior mechanical properties at the elevated temperature. However, it has been reported that the effective lifetime of Ni-base alloy decreased drastically and its strength degraded significantly by the frequent change of the output of power plants to assure the stable power supply with various renewable energies. Conventional linear damage rule could no longer explain the accelerated damage of Ni-base alloy under creep-fatigue loading. Therefore, in this study, a creep-fatigue test was applied to Alloy 625 at 750 oC and the change of its crystallinity was continuously monitored by using FE-SEM (Field Emission Scanning Electron Microscope) and EBSD (Electron Backscattered Diffraction) analysis.</p>

収録刊行物

  • 年次大会

    年次大会 2019 (0), J02336-, 2019

    一般社団法人 日本機械学会

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