Gas Nitriding and Oxidation of Ti-6Al-4V Alloy

Dong Bok Lee; Waheed Ali Abro; Kun Sang Lee; Muhammad Ali Abro; Iryna Pohrelyuk; Oleh Yaskiv

doi:10.4028/www.scientific.net/DDF.382.155

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Gas Nitriding and Oxidation of Ti-6Al-4V Alloy
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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 382Gas Nitriding and Oxidation of Ti-6Al-4V Alloy

Gas Nitriding and Oxidation of Ti-6Al-4V Alloy

Abstract:

The Ti-6Al-4V alloy was nitrided at 950 °C for 8 h by heating under atmospheric nitrogen in order to improve its surface hardness and oxidation resistance. Nitrogen diffused into the Ti6Al4V alloy, and formed ~40 μm-thick coating consisting of TiN as the major phase and Ti₂N as the minor one. Nitriding increased the surface microhardness through the strengthening effect of interstitial nitrogen and the formation of nitrides. Oxidation at 700 °C for 10 h formed a superficial TiO₂ layer on the coating.