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http://dx.doi.org/10.3365/KJMM.2011.49.3.197

Effect of χ Phase Formation on the Mechanical Properties of 25Cr-7Ni-4Mo-0.2N Super Duplex Stainless Steel  

Kang, Chang Yong (Dept. of Metallurgical Engineering, Pukyong National University)
Kim, Jae Hwan (Green Transportation System Institute, Engineering Research Centers, Pukyong National University)
Publication Information
Korean Journal of Metals and Materials / v.49, no.3, 2011 , pp. 197-202 More about this Journal
Abstract
This study was carried out to investigate the precipitation behavior of ${\chi}$ phase and effect of ${\chi}-phase$ which precipitated at the initial stage of aging on mechanical properties of 25%Cr-7%Ni-4%Mo-0.2%N super duplex stainless steel. ${\chi}-phase$ was precipitated mainly at the interface of ferrite / austenite phases and inside of the ferrite phase at the initial stage of aging, and it was transformed into ${\sigma}-phase$ with an increase of aging time. The ferrite phase was decomposed into new $austenite({\gamma}_2)phase$ and ${\sigma}-phase$ by aging treatment. The hardness and tensile strength of the initial stage of aging when ${\chi}-phase$ was precipitated did not changed considerably, while elongation rapidly decreased. Accordingly, it is considered that ${\chi}-phase$ didn't affect the hardness and strength significantly, but it affected the elongation.
Keywords
super duplex stainless steel; impact toughness; ${\chi}$ phase; ${\sigma}$ phase;
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