Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Phase Changes of Pure Ti During High Temperature Gas Nitriding

순 Ti의 고온 가스질화에 따른 미세조직 변화

  • 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)
  • Published : 2009.03.30
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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

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