Effect of thermal Gradient on the Thermomechanical Fatigue Behavior of Thermal Barrier Coating System
- DOI
- 10.2991/icmse-16.2016.54How to use a DOI?
- Keywords
- Ni-base superalloy, Thermal barrier coating, Thermomechanical fatigue, Thermal gradient, Stress
- Abstract
As the key material of gas turbines used in elevated temperature, the mechanism of delamination and failure of thermal barrier coatings (TBCs) under service conditions has been the hot spot of research for a long time.The influence of thermal gradient on thermomechanical fatigue (TMF) behavior of TBCs structures was investigated in this paper. It was demonstrated that under the same strain range, the hollow samples with great thermal gradient experienced much lower maximum tensile stress than solid samples, thus leading to longer TMF lifetime than the solid samples. In solid samples, cracks were initiated in the thermally grown oxidation (TGO), and propagated along the TGO/ ceramic top coat, or propagated into the ceramic top coat, forming the delamination cracks. However, in hollow samples, radial stresses existed in the substrate and bond coat due to the thermal gradient during cooling. In addition, the thermal gradient accelerated Al diffusion from bond coat. These two factors weakened the bond coat and made the cracks propagate into the bond coat.
- Copyright
- © 2016, the Authors. Published by Atlantis Press.
- Open Access
- This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
Cite this article
TY - CONF AU - Feng Huang AU - Zhong-Jiao Zhou AU - Xu Hua AU - Guo-Feng Chen AU - Xiao-Zhou Zhou PY - 2016/12 DA - 2016/12 TI - Effect of thermal Gradient on the Thermomechanical Fatigue Behavior of Thermal Barrier Coating System BT - Proceedings of the 4th 2016 International Conference on Material Science and Engineering (ICMSE 2016) PB - Atlantis Press SP - 328 EP - 333 SN - 2352-5401 UR - https://doi.org/10.2991/icmse-16.2016.54 DO - 10.2991/icmse-16.2016.54 ID - Huang2016/12 ER -