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Effect of Y2O3 Addition on Microstructural Characteristics and Microhardness of Laser-Cladded Ti-6Al-4V Alloy Coating

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Abstract

In this study, the effect of Y2O3 addition on the quality, microstructure, and microhardness of multi-track laser-cladded Ti-6Al-4V coating using coaxial powder feeding was investigated. These parameters were characterised via dye penetration, x-ray diffractometry, scanning electron microscopy, energy dispersive spectrometry, electron probe microanalysis, microhardness measurements, and ball-on-disc tribometer. It is observed that Y2O3 addition improved the coating quality by completely eliminating the formation of pores in multi-tracked Ti-6Al-4V coatings. The microstructure of the coating without and with Y2O3 primarily consists of acicular martensite (α′-Ti). Furthermore, the continuity of original β-Ti grain boundary is broken by the introduction of Y2O3. In addition, the Y2O3 is adsorbed and pinned at the original β-Ti grain boundaries resulting in the refinement of the β-Ti grains. It is believed that the refinement in the original β-Ti grains occurs via inhibition of the movement of the grain solid–liquid interface through dragging action. This phenomenon hinders grain growth by acting as a heterogeneous nucleus rather than increasing nucleation rate because it exhibits high lattice misfit degree. Compared with the coating without the Y2O3, the microhardness and wear stability of the Y2O3-supplemented coating was improved because of grain boundary strengthening, fine-grained strengthening, addition of high hardness Y2O3, and elimination of pores.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Number 51905536) and the Fundamental Research Funds for the Central Universities of China (Grant Numbers 3122019084 and 3122018D013).

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Authors and Affiliations

  1. Engineering Techniques Training Center, Civil Aviation University of China, Tianjin, 300300, China

    Tiangang Zhang

  2. College of Aeronautical Engineering, Civil Aviation University of China, 2898 Jinbei Road, Dongli District, Tianjin, 300300, China

    Haiqiang Xiao, Zhiqiang Zhang, Bo Yao & Fan Yang

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Zhang, T., Xiao, H., Zhang, Z. et al. Effect of Y2O3 Addition on Microstructural Characteristics and Microhardness of Laser-Cladded Ti-6Al-4V Alloy Coating. J. of Materi Eng and Perform 29, 8221–8235 (2020). https://doi.org/10.1007/s11665-020-05316-5

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