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Thermo-mechanical Fatigue Failure of Thermal Barrier Coated Superalloy Specimen

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Abstract

Failure behavior of thermal barrier coated (TBC) Ni-based superalloy specimens were studied from the aspect of the effect of bond coat material behavior on low cycle fatigue (LCF) and thermo-mechanical fatigue (TMF) at various temperatures and under various loading conditions. Initially, monotonic tensile tests were carried out on a MCrAlY alloy bond coat material in the temperature range of 298 K to 1273 K (25 °C to 1000 °C). Special attention was paid to understand the ductile to brittle transition temperature (DBTT). Next, LCF and TMF tests were carried out on the thermal barrier coated Ni-based alloy IN738 specimen. After these tests, the specimens were sectioned to understand their failure mechanisms on the basis of DBTT of the bond coat material. Experimental results demonstrated that the LCF and TMF lives of the TBC specimen were closely related to the DBTT of the bond coat material, and also the TMF lives were different from those of LCF tests. It has also been observed that the crack density in the bond coat in the TBC specimen was significantly dependent on the test conditions. More importantly, not only the number of cracks but also the crack penetration probability into substrate were shown to be sensitive to the DBTT.

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Acknowledgment

Authors are grateful for the financial support from Grant-in-Aid for scientific research (#25249003) by Japan Society for the Promotion of Science (JSPS).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka-machi, Nagaoka, Niigata, 9402188, Japan

    Rajivgandhi Subramanian (PhD Student), Yuzuru Mori (Sales Representative), Satoshi Yamagishi (Assistant Professor) & Masakazu Okazaki (Professor)

  2. Nippon Chuzo Co., Ltd., Tsurumi-ku, Yokohama, Kanagawa Prefecture, Japan

    Yuzuru Mori (Sales Representative)

Authors
  1. Rajivgandhi Subramanian
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  2. Yuzuru Mori
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  3. Satoshi Yamagishi
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  4. Masakazu Okazaki
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Correspondence to Rajivgandhi Subramanian.

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Manuscript submitted October 12, 2014.

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Subramanian, R., Mori, Y., Yamagishi, S. et al. Thermo-mechanical Fatigue Failure of Thermal Barrier Coated Superalloy Specimen. Metall Mater Trans A 46, 3999–4012 (2015). https://doi.org/10.1007/s11661-015-2996-z

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