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Phase Changes of Pure Ti During High Temperature Gas Nitriding  

Lee, H.J. (Forging team, Kisco Corp.)
Kong, J.H. (Department of Materials Science and Engineering, Dong-A University)
Bae, J.B. (MIRAE THERMOTEC)
Seo, J.H. (MIRAE THERMOTEC)
Kim, Y.H. (Department of Materials Science and Engineering, Dong-A University)
Sung, J.H. (Department of Materials Science and Engineering, Dong-A University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.22, no.2, 2009 , pp. 88-94 More about this Journal
Abstract
The effect of high temperature gas nitrding (HTGN) on the surface microstructure in pure Ti was investigated. Two phases of TiN and $Ti_2N$ appeared at the outmost surface, and the wide ${\alpha}$-Ti layer was formed at the next layer. On the other hand, the interior region, where the nitrogen was not permeated, exhibited ${\alpha}$'phase. The outmost surface of TiN and $Ti_2N$ showed the maximum hardness of 1000Hv, while the interior ${\alpha}$'phase was ${\sim}350$ Hv. The permeation depth of nitrogen increased with increasing the gas nitriding temperature and time. The nitrogen concentration of the surface layer seems to be over 12.7% at $1100^{\circ}C$.
Keywords
Pure Ti; High temperature gas nitrding(HTGN); TiN and $Ti_2N$;
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