Creep-fatigue crack growth behaviour based on EBSD observations for notched specimen made of directionally solidified Ni-base superalloy

D. Kobayashi, M. Miyabe, M. Achiwa, R. Sugiura, A. T. Yokobori

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)

    Abstract

    In order to characterise the creep-fatigue crack growth behaviour of a directionally solidified Nibase superalloy, an investigation into damage behaviour based on the electron backscattered diffraction (EBSD) method using notched specimens has been carried out. The average misorientation in the vicinity of notches increases linearly up to the initiation of cracks with the increasing creep strains under creep or creep-fatigue conditions, whereas under fatigue conditions fatigue cracks grew without an increase in misorientation. The stress holding time clearly influenced the growth behaviour of creep-fatigue cracks and the appearance of misorientation development. However, it was shown that the relationship between the average misorientation and the relative notch opening displacement was independent of test conditions such as temperatures, stresses and stress wave forms. It is concluded that the misorientation analysis of damaged samples based on the EBSD method allows the prediction of the initiation of creep-fatigue cracks and their growth behaviours.

    Original languageEnglish
    Pages (from-to)326-333
    Number of pages8
    JournalMaterials at High Temperatures
    Volume31
    Issue number4
    DOIs
    Publication statusPublished - 2014 Nov 1

    Keywords

    • Crack growth
    • Creep-fatigue
    • Damage evaluation
    • Directionally solidified Ni-base superalloy
    • EBSD
    • Misorientation

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

    Fingerprint Dive into the research topics of 'Creep-fatigue crack growth behaviour based on EBSD observations for notched specimen made of directionally solidified Ni-base superalloy'. Together they form a unique fingerprint.

    Cite this