| Abstract |
| In order to improve the low hardness and low wear resistance of Ti-6Al-4V alloy, plasma carburization treatment and CrN film coating was carried out. Effects of the plasma carburization and CrN coating were analyzed and compared with the non-treated alloy by microstructural observation, structural characterization and mechanical property test. The plasma carburization treated alloy formed a carburized layer of about 150 mm in depth from the surface, where a fine and hard particles of TiC and V₄C₃ were evenly homogeneously dispersed through the layer. CrN thin film thickness was about 7.5 mm and grew with (111) orientation. Hardness value of about Hv 402 in the matrix was improved as Hv 1,600, 1,390 by plasma carburization, CrN thin film, respectively. Roughness test is an important method to evaluate the surface treatment effect on the wear resistance. The optimum surface roughness of about 0.063 mm could be obtained by CrN film coated, while, about 0.321 mm and 0.211 ㎛ in the matrix and plasma carburization specimens, respectively. |
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| Key Words |
| Ti-6A1-4V alloy, Plasma-carburizing, CrN thin film, Hardness, Wear |
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