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Open AccessArticle

Thermal Fatigue Failure Behavior of Surface/Interface of Plasma Cladding Layer

by Yang Li 1, Na Tan 1,*, Guo Jin 2, Xiufang Cui 2 and Qiu Li 1
1
National-Local Joint Engineering Laboratory of Intelligent Manufacturing Oriented Automobile Die & Mould, Tianjin University of Technology and Education, Tianjin 300222, China
2
Institute of Surface/Interface Science and Technology, Key Laboratory of Superlight Material and Surface Technology of Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(10), 646; https://doi.org/10.3390/coatings9100646
Received: 16 September 2019 / Revised: 27 September 2019 / Accepted: 3 October 2019 / Published: 6 October 2019
Co-based coating was prepared by plasma cladding on FV520B substrates. Microstructure of the coatings was observed by scanning electron microscope. Finite element simulation as a predictive method to research the stress distributed after thermal cycling. Thermal fatigue resistance of the coating-substrate was evaluated at temperature of 600 °C, 700 °C, 800 °C, and 900 °C. Results indicate that the surface/interface structure has excellent thermal fatigue resistance at 600 °C, and the thermal fatigue crack initiated near the interface and extended along the grain boundary. The difference of expansion coefficient of the coating and substrate is small near 600 °C, and the difference increased when the temperature climbed above 600 °C. The diffuse elements could be found near the interface after the thermal cycle, and the dislocations and precipitated phase were observed.
Keywords: plasma cladding; interface; thermal fatigue; expansion coefficient; element diffusion plasma cladding; interface; thermal fatigue; expansion coefficient; element diffusion
MDPI and ACS Style

Li, Y.; Tan, N.; Jin, G.; Cui, X.; Li, Q. Thermal Fatigue Failure Behavior of Surface/Interface of Plasma Cladding Layer. Coatings 2019, 9, 646.

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