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http://dx.doi.org/10.3740/MRSK.2014.24.11.610

Effect of and R Phase on the Pitting Corrosion in Super Duplex Stainless Steel  

Lee, Byung-Chan (Dep. of Advanced Material Application, Ulsan Campus of KOREA POLYTECHNIC)
Oh, Eun-Ji (Dept. of Metallurgical Engineering, Pukyong National University)
Kang, Chang-Yong (Dept. of Metallurgical Engineering, Pukyong National University)
Publication Information
Korean Journal of Materials Research / v.24, no.11, 2014 , pp. 610-616 More about this Journal
Abstract
In this study, we investigated the precipitation behavior of the R-phase precipitated at the initial stage of aging and its effect on the pitting corrosion of 25%Cr-7%Ni-4%Mo super duplex stainless steel. The R-phase in super duplex stainless steel was mainly precipitated at the interface of ferrite/austenite phases and inside of the ferrite phase during the initial stage of aging, and it was transformed into the ${\sigma}$-phase with an increase in aging time. The ferrite phase was decomposed into a new austenite phase and ${\sigma}$-phase. The R phase was an intermetallic compound, which represented a lower Ni and higher Mo than the matrix, and also had a higher Mo and Cr concentration than the ${\sigma}$ phase. With an increasing aging time, the pitting potential $E_p$ was increased slowly by the precipitation of the R-phase, and it was then steeply decreased by the precipitation of the ${\sigma}$-phase. The R-phase was decreased the pitting potential, but its effect was smaller than effect of ${\sigma}$-phase.
Keywords
super duplex stainless steel; pitting corrosion; R- phase; ${\sigma}$-phase; aging treatment;
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