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Correlation of microstructure with wear and fracture properties of two-layered VC/Ti-6Al-4V surface composites fabricated by high-energy electron-beam irradiation

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Abstract

Correlation of microstructure with the hardness, wear resistance, and fracture toughness of two-layered VC/Ti-6Al-4V surface composites fabricated by high-energy electron-beam irradiation was investigated in this study. A mixture of VC powders and CaF2 flux was deposited on a Ti-6Al-4V substrate, and then an electron beam was irradiated on these powder mixtures to fabricate an one-layered surface composite. A two-layered surface composite was fabricated by irradiating an electron-beam again onto the powder mixture deposited on the one-layered surface composite. The composite layers of 1.2 to 1.5 mm in thickness were homogeneously formed without defects and contained a large amount (25 to 40 vol pct) of carbides in the martensitic or β-Ti matrix. This microstructural modification, including the formation of hard carbides and hardened matrix, improved the hardness and wear resistance. Particularly in the two-layered surface composite containing more carbides, the wear resistance was greatly enhanced to a level 7 times higher than that of the Ti-6Al-4V substrate. In-situ observation of the fracture process showed that microcracks were initiated at carbides and propagated along these microcracked carbides and that shear bands were formed in the matrix between these microcracks. In the two-layered surface composite, numerous microcracks were initiated at many carbides and then rapidly propagated along them, thereby lowering the fracture toughness.

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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 (Research Assistant), Chang Sup Lee (Research Assistant) & Sunghak Lee (Professor)

  2. the Materials Science and Engineering Department, Pohang University of Science and Technology, Korea

    Sunghak Lee (Professor)

Authors
  1. Jun Cheol Oh
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  2. Chang Sup Lee
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  3. Sunghak Lee
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Oh, J.C., Lee, C.S. & Lee, S. Correlation of microstructure with wear and fracture properties of two-layered VC/Ti-6Al-4V surface composites fabricated by high-energy electron-beam irradiation. Metall Mater Trans A 33, 3173–3185 (2002). https://doi.org/10.1007/s11661-002-0303-2

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  • DOI: https://doi.org/10.1007/s11661-002-0303-2

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