TY - JFULL AU - Dong Bok Lee and Min Jung Kim PY - 2017/3/ TI - Effect of Gas-Diffusion Oxynitriding on Microstructure and Hardness of Ti-6Al-4V Alloys T2 - International Journal of Materials and Metallurgical Engineering SP - 140 EP - 144 VL - 11 SN - 1307-6892 UR - https://publications.waset.org/pdf/10006350 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 122, 2017 N2 - The commercially available titanium alloy, Ti-6Al-4V, was oxynitrided in the deoxygenated nitrogen gas at high temperatures followed by cooling in oxygen-containing nitrogen in order to analyze the influence of oxynitriding parameters on the phase modification, hardness, and the microstructural evolution of the oxynitrided coating. The surface microhardness of the oxynitrided alloy increased due to the strengthening effect of the formed titanium oxynitrides, TiNxOy. The maximum microhardness was obtained, when TiNxOy had near equiatomic composition of nitrogen and oxygen. It could be attained under the optimum oxygen partial pressure and temperature-time condition. ER -