발간논문

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Vol.38, No.6, 829 ~ 836, 2000
Title
Pesearch Paper / Surface Treatment : Fabrication and Microstructural Analysis of Boride ( Ti - 6Al - 4V Surface - Alloyed Materials Using High - Energy Electron Beam Irradiation )
어광준Kwang Jun Euh,이종민Jong Min Lee,이성학Sang Hak Lee
Abstract
The present study is concerned with fabrication and microstructural analysis of boride/Ti-6Al-4V surface-alloyed materials using irradiation of high-energy electron beam. Mixtures of TiB₂ or MoB boride powders and CaF₂ flux were placed on a Ti-6AI-4V alloy substrate, and then electron beam was irradiated on these mixtures using an electron beam accelerator. In the specimens processed with a flux mixing ratio of 40 wt.%, the melted region of 1.1∼1.5 ㎜ in thickness was homogeneously formed without defects, and contained a large amount of TiB borides. This microstructural modification including the formation of TiB borides and β-Ti matrix in the surface-alloyed layers greatly improved hardness, about twice higher than hardness of the Ti alloy substrate. 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.
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