Proceedings of the 4th 2016 International Conference on Material Science and Engineering (ICMSE 2016)

Effect of thermal Gradient on the Thermomechanical Fatigue Behavior of Thermal Barrier Coating System

Authors
Feng Huang, Zhong-Jiao Zhou, Xu Hua, Guo-Feng Chen, Xiao-Zhou Zhou
Corresponding Author
Feng Huang
Available Online December 2016.
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/).

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Volume Title
Proceedings of the 4th 2016 International Conference on Material Science and Engineering (ICMSE 2016)
Series
Advances in Engineering Research
Publication Date
December 2016
ISBN
10.2991/icmse-16.2016.54
ISSN
2352-5401
DOI
10.2991/icmse-16.2016.54How to use a DOI?
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  -