Improvement of the hardness and wear resistance of (TiC, TiN)/Ti-6Al-4V surface-alloyed materials fabricated by high-energy electron-beam irradiation |
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| Authors: | Jun Cheol Oh Sunghak Lee Mikhail G Golkovski |
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| Affiliation: | (1) the Center for Advanced Aerospace Materials, Pohang University of Science and Technology, 790-78 Pohang, Korea;(2) the Materials Science and Engineering Department, Pohang University of Science and Technology, USA;(3) the Applications of Industrial Accelerators, The Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia |
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| Abstract: | This study is concerned with the microstructural analysis and improvement of the hardness and wear resistance of Ti-6Al-4V
surface-alloyed materials fabricated by a high-energy electron beam. The mixtures of TiC, TiN, or TiC + TiN powders and CaF2 flux were deposited on a Ti-6Al-4V substrate, and then the electron beam was irradiated on these mixtures. In the specimens
processed with a flux addition, the surface-alloyed layers of 1 mm in thickness were homogeneously formed without defects
and contained a large amount (over 30 vol pct) of precipitates such as TiC, TiN, (Ti
x
Al1−x
)N, and Ti(C
x
N1−x
) in the martensitic or N-rich acicular α-Ti matrix. This microstructural modification, including the formation of hard precipitates and hardened matrices in the surface-alloyed
layers, improved the hardness and wear resistance. Particularly in the surface-alloyed material fabricated by the deposition
of TiN powders, the wear resistance was greatly enhanced to a level 10 times higher than that of the Ti alloy substrate. These
findings suggested that surface alloying using high-energy electron-beam irradiation was economical and useful for the development
of titanium-based surface-alloyed materials with improved hardness and wear resistance. |
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| Keywords: | |
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