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Effect of Y2O3 on cracking susceptibility of laser-clad Ti-based composites coatings

  • Metallic Materials
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Abstract

Ti-based composite coatings reinforced by in situ synthesized TiB and TiC were deposited on Ti6Al4V substrates by laser cladding. The effects of Y2O3 on the microstructure and cracking susceptibility of the coatings were investigated in details. It is shown that a small amount of Y2O3 addition can significantly refine the microstructure of the coatings by hastening spheroidization of the primary phase structure. The maximum refinement in microstructure was obtained with the optimum (2 wt%) addition of Y2O3. Moreover, it can increase the volume fraction of TiC and reduce the residual stress of the coatings due to the decrease in lattice distortion of the α(Ti) matrix. All of these factors lead to the reduction in cracking susceptibility of the coatings containing Y2O3 on the premise that the hardness of the coatings is improved. The fracture toughness of the coatings without and with Y2O3 (2 wt%) is 8.32 and 17.36 MPa·m1/2, respectively. Scanning electron microscope examination reveals a transition of the fractured surfaces from cleavage fracture to quasi-cleavage fracture resulting from the Y2O3 addition.

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Authors and Affiliations

  1. School of Materials Engineering, Shanghai University of Engineering Science, Shanghai, 201620, China

    Jun Li  (李军), Guangjie Li & Xing Luo

Authors
  1. Jun Li  (李军)
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  2. Guangjie Li
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  3. Xing Luo
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Correspondence to Jun Li  (李军).

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Funded by the the National Natural Science Foundation of China (No.51002093) and “Shu Guang” Project of Shanghai Municipal Education Commission and Shanghai Education Development Foundation (No.12SG44)

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Li, J., Li, G. & Luo, X. Effect of Y2O3 on cracking susceptibility of laser-clad Ti-based composites coatings. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 29, 1011–1018 (2014). https://doi.org/10.1007/s11595-014-1035-z

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  • DOI: https://doi.org/10.1007/s11595-014-1035-z

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