高温クリープ負荷環境における窒素添加ステンレス鋼SUS316の粒界割れ機構の解明

DOI Web Site
  • 顧 崇哲
    東北大学大学院工学研究科ファインメカニクス専攻
  • 高橋 祐佳子
    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
  • Damage Mechanism of the Acceleration of Intergranular Cracking of Stainless Steel SUS316LN under Creep Loading at Elevated Temperature

抄録

<p>In this study, an intermittent creep test was applied to the continuous observation of the change of the micro texture of SUS316LN and the initiation of intergranular cracking. It was found that the accumulation of dislocations along specific grain boundaries which were perpendicular to the direction of the applied uniaxial stress and the difference of the magnitude of plastic deformation between two nearby grains were the dominant factors of intergranular cracking. The large difference in the Schmid Factor between the nearby grains was attributed to the accumulation, and thus, the place where intergranular cracking started to occur. In addition, comparison experiments between SUS316L and SUS316LN were carried out to verify the improvement effect of material strength due to nitrogen doping. The relationship between nitrogen doping and Stacking Fault Energy (SFE) was briefly discussed.</p>

収録刊行物

  • 年次大会

    年次大会 2020 (0), J03146-, 2020

    一般社団法人 日本機械学会

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