| Title |
Surface Treatment : Microstructure and Wear Properties of (TiC, TiB)/Ti-6Al-4V Surface-Alloyed Materials Fabricated by High-Energy Electron Beam Irradiation |
| Authors |
이창섭(Chang Sup Lee); 오준철(Jun Cheol Oh); 이성학(Sung Hak Lee) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Surface alloying; Electron beam irradiation; Ti-6A1-4V; TiC; TiB; Flux; Wear resistance; Hardness |
| Abstract |
The present study is concerned with the microstructural analysis and the evaluation of hardness and wear properties of (TiC,TiB)/Ti-6Al-4V surface-alloyed materials fabricated by high-energy electron beam irradiation. The mixtures of Ti+C, TiC+TiB_2, and Ti+B_4C powders and CaF_2 flux were deposited on a Ti-6Al-4V substrate, and then electron beam was irradiated on these mixtures using an electron beam accelerator. The surface-alloyed layers of 0.9∼1.6mm in thickness were formed without defects, and contained a large amount (30∼44vol.%) of precipitates such as TiC and TiB in the martensitic matrix. This microstructural modification including the formation of hard precipitates and hardened matrix in the surface-alloyed layers resulted in the improvement hardness and wear resistance. Particularly in the surface-alloyed material fabricated with Ti+B_4C powders, the wear resistance was greatly enhanced by nine times higher than that of the Ti alloy substrate because a 44 vol.% of TiB and TiC was precipitated homogeneously in the martensitic matrix. These findings suggested that the surface-alloying using high-energy electron beam irradiation was useful for the development of titanium-base surface-alloyed materials with increased surface hardness and improved wear properties. |