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Correlation of microstructure with the hardness and wear resistance of (TiC,SiC)/Ti-6Al-4V surface composites fabricated by high-energy electron-beam irradiation

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Abstract

The correlation of microstructure with the hardness and wear resistance of (TiC,SiC)/Ti-6Al-4V surface composites fabricated by high-energy electron-beam irradiation was investigated in this study. The mixtures of TiC, SiC, or TiC + SiC powders and CaF2 flux were placed on a Ti-6Al-4V substrate, and then an electron beam was irradiated on these mixtures using an electron-beam accelerator. The surface composite layers of 1.2 to 2.1 mm in thickness were formed without defects and contained a large amount (up to 66 vol pct) of precipitates such as TiC and Ti5Si3 in the martensitic matrix. This microstructural modification, including the formation of hard precipitates and a hardened matrix in the surface composite layer, improved the hardness and wear resistance. Particularly in the surface composite fabricated with TiC + SiC powders, the wear resistance was greatly enhanced to a level 25 times higher than that of the Ti alloy substrate, because 66 vol pct of TiC and Ti5Si3 was precipitated homogeneously in the hardened martensitic matrix. These findings suggested that high-energy electron-beam irradiation was useful for the development of Ti-based surface composites with improved hardness and wear properties.

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Authors and Affiliations

  1. the Center for Advanced Aerospace Materials, Pohang University of Science and Technology, 790-784, Pohang, Korea

    Jun Cheol OH (Postdoctoral Research Associate), Eunsub Yun (Research Assistant) & Sunghak Lee (Professor)

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  1. Jun Cheol OH
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  2. Eunsub Yun
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  3. Sunghak Lee
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OH, J.C., Yun, E. & Lee, S. Correlation of microstructure with the hardness and wear resistance of (TiC,SiC)/Ti-6Al-4V surface composites fabricated by high-energy electron-beam irradiation. Metall Mater Trans A 35, 525–534 (2004). https://doi.org/10.1007/s11661-004-0363-6

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  • DOI: https://doi.org/10.1007/s11661-004-0363-6

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