Influence of thermal barrier coatings on multiaxial thermo-mechanical fatigue properties of single crystal superalloy

doi:10.13251/j.issn.0254-6051.2022.06.040

Abstract

Abstract: Y₂O₃(7%-8%, mass fraction)-ZrO₂ thermal barrier coatings were deposited on the surface of CMSX-4 single crystal alloy hollow test tube by electron beam physical vapor deposition process, then thermo-mechanical fatigue (TMF) and thermal gradient mechanical fatigue (TGMF) tests of the tube with/without coatings were investigated at 500-1000 ℃ under mechanical strain control. The results indicate that the thermal barrier coatings can improve the fatigue life of the single crystal alloy to a certain extent, and the fatigue life of the in-plane (IP) coated specimens is slightly higher than that of the out-plane (OP) coated specimens at the same strain amplitude. Furthermore, the fracture analysis results indicate that there is significant difference in the fatigue fracture between the IP-TMF coated specimens and the OP-TMF coated specimens. Obvious fatigue striation can be observed on the fracture surface of the OP-TMF coated specimens, and creep and oxidation have little effect on the fracture, while the fracture of the IP-TMF coated specimens is obviously related to the creep and oxidation of the material.

Key words: thermo-mechanical fatigue (TMF), thermal barrier coatings (TBCs), single crystal alloy, creep, oxidation

CLC Number:

TB31

Gao Dong, Qian Lingyi, Guo Yunshan, Huang Aihua. Influence of thermal barrier coatings on multiaxial thermo-mechanical fatigue properties of single crystal superalloy[J]. Heat Treatment of Metals, 2022, 47(6): 216-221.

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