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

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)142-148
    Number of pages7
    JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
    Volume74
    Issue number3
    DOIs
    Publication statusPublished - 2010 Mar 1

    Keywords

    • Branch cracking
    • Creep
    • Finite element analysis
    • Microstructural strengthening
    • Nickel based superalloy

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Mechanics of Materials
    • Metals and Alloys
    • Materials Chemistry

    Fingerprint Dive into the research topics of 'Branch cracking behavior under high temperature creep condition related to the microstructural strengthening mechanism of IN100'. Together they form a unique fingerprint.

  • Cite this