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Modeling of the residual stresses in plasma-spraying functionally graded ZrO2/NiCoCrAlY coatings using finite element method
AbstractThe thermo-mechanical behaviors and the distribution of residual stresses in functionally graded ZrO2/NiCoCrAlY coatings due to thermal spraying were analyzed by thermo-mechanical finite element analysis (FEA). To different coatings, they each have a remarkable stress concentration at the edge of the interfaces. The effects of ZrO2 topcoat to substrate thickness ratio and cooling rate on the residual stresses distribution were obtained by ZrO2/NiCoCrAlY two-layer duplex coating systems. Moreover, the effects of 50%ZrO2+50%NiCoCrAlY interlayer and its thickness on the residual stresses in the functionally graded ZrO2/NiCoCrAlY coatings were also discussed. Modeling results showed that the level of residual stresses at the critical interface regions (i.e., coating/substrate interface, coating surface etc.) is obviously influenced by coating to substrate thickness ratio, the presence of interlayer and cooling rate. Furthermore, the residual stress-induced failure model of coatings is also discussed. These studies can be used to optimize the design and processing of some plasma-spraying coating.
Modeling of the residual stresses in plasma-spraying functionally graded ZrO2/NiCoCrAlY coatings using finite element method
AbstractThe thermo-mechanical behaviors and the distribution of residual stresses in functionally graded ZrO2/NiCoCrAlY coatings due to thermal spraying were analyzed by thermo-mechanical finite element analysis (FEA). To different coatings, they each have a remarkable stress concentration at the edge of the interfaces. The effects of ZrO2 topcoat to substrate thickness ratio and cooling rate on the residual stresses distribution were obtained by ZrO2/NiCoCrAlY two-layer duplex coating systems. Moreover, the effects of 50%ZrO2+50%NiCoCrAlY interlayer and its thickness on the residual stresses in the functionally graded ZrO2/NiCoCrAlY coatings were also discussed. Modeling results showed that the level of residual stresses at the critical interface regions (i.e., coating/substrate interface, coating surface etc.) is obviously influenced by coating to substrate thickness ratio, the presence of interlayer and cooling rate. Furthermore, the residual stress-induced failure model of coatings is also discussed. These studies can be used to optimize the design and processing of some plasma-spraying coating.
Modeling of the residual stresses in plasma-spraying functionally graded ZrO2/NiCoCrAlY coatings using finite element method
Zhang, X.C. (author) / Xu, B.S. (author) / Wang, H.D. (author) / Wu, Y.X. (author)
2004-10-26
8 pages
Article (Journal)
Electronic Resource
English
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