Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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High Temperature Precipitation Behavior of High-Nitrogen Duplex Stainless Steel

고질소 2상 스테인리스강의 고온 석출거동

  • 배종인 (부산대학교 재료공학과) ;
  • 김성태 (한국기계연구원 부설 재료연구소) ;
  • 이태호 (한국기계연구원 부설 재료연구소) ;
  • 하헌영 (한국기계연구원 부설 재료연구소) ;
  • 김성준 (한국기계연구원 부설 재료연구소) ;
  • 박용호 (부산대학교 재료공학과)
  • Received : 2010.09.24
  • Published : 2011.02.25
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Abstract

Precipitation behavior of high-nitrogen duplex Fe-24Cr-7Mn-4Ni-4Mo-0.43N stainless steel aged at $850^{\circ}C$ was investigated using scanning transmission electron microscopy. Based on the analyses of selected area diffraction patterns, four kinds of precipitates (intermetallic sigma (${\sigma}$) and chi (${\chi}$), $Cr_2N$ and secondary austenite) were identified. At the ferrite/austenite phase boundary, the ${\sigma}$ phase and secondary austenite were formed via ${\alpha}{\rightarrow}{\gamma}+{\sigma}$ eutectoid reaction. The precipitation of $Cr_2N$ occurred at the austenite grain boundary as well as the interior of the ferrite. The intermetallic ${\chi}$ phase also formed within the ferrite and showed a cube-cube orientation relationship with the ferrite. Further aging produced a lamellar structure composed of $Cr_2N$ and austenite along the ferrite/austenite boundary and enhanced the precipitation of the ${\chi}$ phase. The crystallographic features of the precipitates were also examined in terms of the orientation relationship with the austenite or ferrite matrix.

Keywords

Acknowledgement

Supported by : 지식경제부

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