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Effects of Tungsten on the Precipitation Kinetics of Secondary Phases and the Associated Susceptibility to Pitting Corrosion in Duplex Stainless Steels  

Park, Chan-Jin (School of Material Science and Engineering, Chonnam National University)
Kwon, Hyuk-Sang (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology(KAIST))
Publication Information
Corrosion Science and Technology / v.5, no.6, 2006 , pp. 189-195 More about this Journal
Abstract
Effects of tungsten (W) on the precipitation kinetics of secondary phases and the associated resistance to pitting corrosion of 25%Cr duplex stainless steels were investigated through microstructural and electrochemical noise analyses. With the partial substitution of W for Mo in duplex stainless steel, the potential and current noises of the alloy were significantly decreased in chloride solution due to retardation of the ${\sigma}$ phase precipitation. The preferential precipitation of the $\chi$ phase in the W-containing alloy during the early period of aging contributed to retarding the precipitation of the $\sigma$ phase by depleting W and Mo along grain boundaries. In addition, the retardation of the nucleation and growth of the $\sigma$ phase in the W-containing alloy appears to be attributed to the inherently low diffusivity of W compared with that of Mo.
Keywords
duplex stainless steels; tungsten; secondary phase; electrochemical noise; pitting corrosion;
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