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


Download this paper for $25 PDF (444K)          View License Agreement
        Click here to download the complete source publication for $109 PDF (8.2M)


Source: STP1428-EB


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

Paper ID: STP11439S
Committee/Subcommittee: E08.05
DOI: 10.1520/STP11439S
CrossRef ASTM International is a member of CrossRef.