STP1428

    Acoustic Emission Analysis of Damage Accumulation During Thermal and Mechanical Loading of Coated Ni-Base Superalloys

    Published: Jan 2003


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    Abstract

    Acoustic emission (AE) allows for the in-situ monitoring of damage during the thermal and mechanical solicitation of a material and can be used to identify various damage mechanisms and interpret the way they interact, in particular, in multi-material systems. In the present work AE activity was monitored during the step-wise tensile testing and during the thermomechanical fatigue (TMF) of Ni-base superalloys (in single-crystalline and directionallysolidified form), coated with oxidation protection coatings. The classification analysis of the AE signals revealed that AE monitoring provides complementary and specific information about the surface-, subsurface-, and bulk damage processes. In combination with the mechanical response and the surface damage analysis by video imaging, it represents a powerful means for non-destructive damage assessment and it offers possibilities for the lifing of coated material systems.

    Keywords:

    Nickel-base superalloys, thermomechanical fatigue, acoustic emission, damage mechanisms, CMSX4, CM186


    Author Information:

    Vougiouklakis, Y
    Grantholder, Scientific Officer, Technical Officer, and Scientific Officer, DG-Joint Research Centre, Institute for Energy, ZG Petten,

    Hähner, P
    Grantholder, Scientific Officer, Technical Officer, and Scientific Officer, DG-Joint Research Centre, Institute for Energy, ZG Petten,

    de Haan, F
    Grantholder, Scientific Officer, Technical Officer, and Scientific Officer, DG-Joint Research Centre, Institute for Energy, ZG Petten,

    Stamos, V
    Grantholder, Scientific Officer, Technical Officer, and Scientific Officer, DG-Joint Research Centre, Institute for Energy, ZG Petten,

    Peteves, SD
    Grantholder, Scientific Officer, Technical Officer, and Scientific Officer, DG-Joint Research Centre, Institute for Energy, ZG Petten,


    Paper ID: STP11439S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP11439S


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