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Durability of plasma-sprayed Cr3C2-NiCr coatings under rolling contact conditions

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Abstract

The aim of this paper was to address the rolling contact fatigue (RCF) failure mechanisms of plasmasprayed Cr3C2-NiCr coatings under different tribological conditions of contact stress. Weibull distribution plots of fatigue lives of the coated specimens at different contact stresses were obtained. The failure modes of coatings were identified on the basis of wore surface observations of the failed coatings. Results showed that the RCF failure modes can be classified into four main categories, i.e., surface abrasion, spalling, cohesive delamination, and interfacial delamination. The probabilities of the surface abrasion and spalling type failures were relatively high at low contact stress. When the coatings were subjected to abrasion and spalling type failures, the failure of the coating was depended on the microstrcture of the coating. The stress concentration near the micro-defects in the coating may be the may reason for the formation of spall. The coatings were prone to fail in delamination under higher contact stresses. However, the delamination of coating may be related to distribution of shear stress amplitude within coating. The location of maximum shear stress amplitude can be used as a key parameter to predict the initiation of subsurface cracks within coating in rolling contact.

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Authors and Affiliations

  1. Key Laboratory of Safety Science of Pressurized System, Ministry of Education, East China University of Science and Technology, Shanghai, 200237, China

    Xiancheng Zhang, Fuzhen Xuan & Shantung Tu

  2. Shanghai Key Lab of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai, 200030, China

    Xiancheng Zhang, Binshi Xu & Yixiong Wu

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  1. Xiancheng Zhang
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  2. Fuzhen Xuan
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  3. Shantung Tu
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  4. Binshi Xu
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  5. Yixiong Wu
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Correspondence to Xiancheng Zhang.

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Zhang, X., Xuan, F., Tu, S. et al. Durability of plasma-sprayed Cr3C2-NiCr coatings under rolling contact conditions. Front. Mech. Eng. 6, 118–135 (2011). https://doi.org/10.1007/s11465-011-0127-0

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  • DOI: https://doi.org/10.1007/s11465-011-0127-0

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