Branch cracking behavior under high temperature creep condition related to the microstructural strengthening mechanism of IN100

A. Yoshiko Nagumo, Toshimitsu Yokobori, Ryuji Sugiura, Takashi Matsuzaki, Yusuke Ito

    研究成果: Article査読

    1 被引用数 (Scopus)

    抄録

    Recently, the development of the high-efficiency technology for gas turbine and jet engine is required to minimize carbon dioxide and nitrogen oxide emission. It is effective way to increase the operational temperature to develop the high-efficiency technology for high temperature instruments. To increase the operating temperature, advanced nickel based superalloys have been developed as a turbine blade material. Even though a nickel based superalloy is used for a structural component, creep damages and creep cracks may be caused due to the external tensile load under high temperature conditions. Therefore, a predictive law of creep crack growth life is necessary to maintain operational safety. This study is aimed to clarify the branch cracking behavior due to the microstructural strengthening mechanism of polycrystalline nickel based superalloy IN100 under the creep condition. The creep crack growth tests were conducted at a temperature of 900°C. The creep crack growth behavior and creep damage formulation were observed by in-situ observational system and SEM/EBSD. Additionally, two dimensional elastic-plastic creep finite element analyses were conducted for the model, which describes the experimental results. The creep crack growth behavior and the creep damage progression were found to be affected by the distribution behaviors of grains and grain boundaries around the notch tip. By comparison of experimental results with mechanical analysis using FEM analyses, mechanisms of the creep crack growth and the creep damage formulation were clarified.

    本文言語English
    ページ(範囲)142-148
    ページ数7
    ジャーナルNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
    74
    3
    DOI
    出版ステータスPublished - 2010 3月

    ASJC Scopus subject areas

    • 凝縮系物理学
    • 材料力学
    • 金属および合金
    • 材料化学

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