An assessment and estimation of the damage progression behavior of IN738LC under various applied stress conditions based on EBSD analysis

Daisuke Kobayashi, Masamichi Miyabe, Yukio Kagiya, Ryuji Sugiura, A. Toshimitsu Yokobori

    研究成果: Article査読

    32 被引用数 (Scopus)

    抄録

    In order to characterize the damage progression behavior of IN738LC and the influence of applied stress, the average misorientation within grains was evaluated using the electron backscattered diffraction (EBSD) method, by measuring over a million data points located across almost the whole zone of the tested specimens. It has been shown under various test conditions such as differing temperatures and strain rates that the average misorientation increases linearly with the increase of creep strains. As a result, it is confirmed that it is possible to assess the remaining creep fracture life from its average misorientation value regardless of the testing temperature and strain rate. In addition, the deformation and fracture mechanisms of various types of mechanical damage, such as tensile, impact, and creep conditions, were discussed by evaluating the characteristics of misorientation distribution. As a result, it has been revealed that creep damage affects a large area of the material, but it is localized near grain boundaries, which is completely different from that of tensile or impact damage. In conclusion, detailed investigation into the cross section of fracture samples using the EBSD misorientation analysis allows for the qualitative estimation of the fracture mode under various applied stress conditions, the cause of the fracture.

    本文言語English
    ページ(範囲)3123-3135
    ページ数13
    ジャーナルMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
    44
    7
    DOI
    出版ステータスPublished - 2013 3月 18

    ASJC Scopus subject areas

    • 凝縮系物理学
    • 材料力学
    • 金属および合金

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