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Crystal-Structure-Based Modeling Study of Temperature-Dependent Fracture Toughness for Brittle Coating Deposited on Ductile Substrate

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Abstract

The temperature-dependent fracture toughness of a brittle coating/ductile substrate system, WC-10Co4Cr deposited on 1018 low carbon steel, is evaluated at microscopic level using an indentation-based model in terms of the Arrhenius-type equation and rate-controlling theory. The formulation of the model utilizes the parameters of crystal structures of each phase in the coating material. The slip systems of hard hexagonal \( \updelta \)-WC phase and soft FCC \( \upalpha \)-Co phase are analyzed. The fracture toughness of the two-phase coating is obtained by integrating the fracture toughness of single \( \updelta \)-WC phase coating and that of single \( \upalpha \)-Co phase coating using either the basic mixture method or the unconstrained mixture method. The results suggest that the fracture toughness of WC-10Co4Cr coating/1018 low carbon steel substrate system may remain constant until the temperature reaches a critical value, about 200 K, and ranges from 2.16 to 10.82 \( {\text{MPa}}\;{\text{m}}^{1/2} \), with temperature increasing from room temperature (298 K) to 1000 K.

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Acknowledgment

The authors are grateful for the financial support from Natural Science and Engineering Research Council of Canada (NSERC), the in-kind support from National Research Council Canada (NRC) and both financial and in-kind support from Kennametal Satellite Inc.

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel By Drive, Ottawa, ON, K1S 5B6, Canada

    Yichen Gu & Rong Liu

  2. Institute for Aerospace Research, National Research Council of Canada, 1200 Montreal Road, Ottawa, ON, K1A 0R6, Canada

    Kuiying Chen

  3. Kennametal Stellite Inc., 471 Dundas St E, Belleville, ON, K8N 5C4, Canada

    Matthew X. Yao & Rachel Collier

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  1. Yichen Gu
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Correspondence to Rong Liu.

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Gu, Y., Chen, K., Liu, R. et al. Crystal-Structure-Based Modeling Study of Temperature-Dependent Fracture Toughness for Brittle Coating Deposited on Ductile Substrate. J Therm Spray Tech 25, 1344–1356 (2016). https://doi.org/10.1007/s11666-016-0452-2

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