Improvement of hardness and wear resistance of (TiC,TiB)/Ti-6Al-4V surface-alloyed materials fabricated by high-energy electron-beam irradiation |
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Authors: | Chang Sup Lee Jun Cheol Oh Sunghak Lee |
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Affiliation: | (1) Present address: the Center for Advanced Aerospace Materials, Pohang University of Science and Technology, 790-784 Pohang, Korea;(2) the Materials Science and Engineering Department, Pohang University of Science and Technology, Korea |
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Abstract: | The objective of this study is to investigate microstructure, hardness, and wear properties of three kinds of (TiC,TiB)/Ti-6Al-4V
surface-alloyed materials fabricated by high-energy electron-beam irradiation. The mixtures of Ti+C, TiC+TiB2, and Ti+B4C powders and CaF2 flux were deposited on a Ti-6A1-4V substrate, and then high-energy electron beam was irradiated on these mixtures. The surface-alloyed
layers of 0.9 to 1.6 mm in thickness were homogeneously formed, and contained a large amount (30 to 44 vol. pct) of hard precipitates
such as TiC and TiB in the martensitic matrix. This microstructural modification improved the hardness and wear resistance
of the surface-alloyed layer 2 times and 6 to 9 times, respectively, greater than that of the substrate. Particularly, the
surface-alloyed material fabricated with Ti+B4C powders had a larger volume fraction of TiB and TiC homogeneously distributed in the martensitic matrix, and thus showed
the best hardness and wear resistance. These findings suggested that the surface-alloying using high-energy electron-beam
irradiation was economical and useful for the development of titanium-base surface-alloyed materials with improved hardness
and wear properties. |
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