TY - JOUR
T1 - Evolution of Surface Morphology of Thermo-Mechanically Cycled NiCoCrAlY Bond Coats
AU - Shi, J.
AU - Karlsson, Anette M
AU - Baufeld, B.
AU - Bartsch, M.
N1 - Shi, J., Karlsson, A. M., Baufeld, B., 2006, "Evolution of Surface Morphology of Thermo-Mechanically Cycled NiCoCrAlY Bond Coats," Materials Science & Engineering A, 434(1-2) pp. 39-52.
PY - 2006/10/25
Y1 - 2006/10/25
N2 - We investigate morphological surface instabilities on bond coat surfaces of thermal barrier coatings, induced due to thermo-mechanical loading. Experimental results of hollow circular cylindrical specimens, consisting of a directionally solidified superalloy (IN 100 DS) coated with a NiCoCrAlY bond coat, show that the morphological instabilities are strongly dependent on the load conditions. In particular, the morphological instabilities develop during thermal cycling with a thermal gradient over the cylinder wall, whereas the surface remains smooth for thermal cyclic conditions without a gradient. Furthermore, if a cyclic, axial tensile force is applied (synchronized with the thermal cycling), the morphological instabilities become aligned with the axial direction. We discuss a model, quantified by finite element simulations, capturing this behavior and elucidating the thermo-mechanical response.
AB - We investigate morphological surface instabilities on bond coat surfaces of thermal barrier coatings, induced due to thermo-mechanical loading. Experimental results of hollow circular cylindrical specimens, consisting of a directionally solidified superalloy (IN 100 DS) coated with a NiCoCrAlY bond coat, show that the morphological instabilities are strongly dependent on the load conditions. In particular, the morphological instabilities develop during thermal cycling with a thermal gradient over the cylinder wall, whereas the surface remains smooth for thermal cyclic conditions without a gradient. Furthermore, if a cyclic, axial tensile force is applied (synchronized with the thermal cycling), the morphological instabilities become aligned with the axial direction. We discuss a model, quantified by finite element simulations, capturing this behavior and elucidating the thermo-mechanical response.
KW - Elastic– plastic material; Finite elements; Thermo-mechanical testing; Thermal barrier coatings; Thermal cycling; Oxidation
UR - https://engagedscholarship.csuohio.edu/enme_facpub/132
U2 - 10.1016/j.msea.2006.07.048
DO - 10.1016/j.msea.2006.07.048
M3 - Article
VL - 434
JO - Materials Science & Engineering A
JF - Materials Science & Engineering A
ER -