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http://dx.doi.org/10.3365/KJMM.2011.49.2.093

High Temperature Precipitation Behavior of High-Nitrogen Duplex Stainless Steel  

Bae, Jong-In (School of Materials Science & Engineering, Pusan National University)
Kim, Sung-Tae (Korea Institute of Materials Science)
Lee, Tae-Ho (Korea Institute of Materials Science)
Ha, Heon-Young (Korea Institute of Materials Science)
Kim, Sung-Joon (Korea Institute of Materials Science)
Park, Yong-Ho (School of Materials Science & Engineering, Pusan National University)
Publication Information
Korean Journal of Metals and Materials / v.49, no.2, 2011 , pp. 93-103 More about this Journal
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
alloys; aging; precipitation; transmission electron microscopy(TEM); high-nitrogen duplex stainless steel;
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