SEDL / STP / STP1428-EB / STP11439S

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

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,

Pages: 15    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.