Abstract
Thermal barrier coatings (TBCs) were deposited on DD6 specimens with [001] orientation, and the TBCs coated DD6 specimens were exposed at 1150 °C for one hour. Then, both the TBCs coated and bared specimens were subjected to high-cycle fatigue (HCF) testing at 900 °C in ambient atmosphere. The results revealed that the HCF life decreased with increasing stress amplitude and the fatigue strength of the TBCs coated substrate was higher than that of the bared alloy. There are two main reasons for this phenomenon, one is because the coating can bear part of the load and make the specimens stronger and the other is the existence of residual compressive stresses. SEM and TEM were used to observe the microstructure near the fracture. For the TBCs coated alloy, many pores and cracks appeared at the bond coat after HCF test, and the fatigue cracks may be resulted from some of them. In the process of testing, the crack expanded to the substrate and propagated along {111} octahedral slip planes.
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Dong, J., Li, J., Mu, R., Tian, H. (2019). Fatigue Behavior of Thermal Barrier Coated DD6 Single Crystal Superalloy at 900 °C. In: Han, Y. (eds) Physics and Engineering of Metallic Materials. CMC 2018. Springer Proceedings in Physics, vol 217. Springer, Singapore. https://doi.org/10.1007/978-981-13-5944-6_34
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DOI: https://doi.org/10.1007/978-981-13-5944-6_34
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