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Effect of Secondary Phase Precipitation on the Corrosion Behavior of Duplex Stainless Steels

Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
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Materials 2014, 7(7), 5268-5304; https://doi.org/10.3390/ma7075268
Received: 17 April 2014 / Revised: 2 July 2014 / Accepted: 11 July 2014 / Published: 22 July 2014
(This article belongs to the Special Issue Corrosion of Materials)
Duplex stainless steels (DSSs) with austenitic and ferritic phases have been increasingly used for many industrial applications due to their good mechanical properties and corrosion resistance in acidic, caustic and marine environments. However, DSSs are susceptible to intergranular, pitting and stress corrosion in corrosive environments due to the formation of secondary phases. Such phases are induced in DSSs during the fabrication, improper heat treatment, welding process and prolonged exposure to high temperatures during their service lives. These include the precipitation of sigma and chi phases at 700–900 °C and spinodal decomposition of ferritic grains into Cr-rich and Cr-poor phases at 350–550 °C, respectively. This article gives the state-of the-art review on the microstructural evolution of secondary phase formation and their effects on the corrosion behavior of DSSs. View Full-Text
Keywords: duplex stainless steel; sigma phase; spinodal decomposition; nitride; intergranular corrosion; critical pitting temperature; stress corrosion; welding duplex stainless steel; sigma phase; spinodal decomposition; nitride; intergranular corrosion; critical pitting temperature; stress corrosion; welding
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Chan, K.W.; Tjong, S.C. Effect of Secondary Phase Precipitation on the Corrosion Behavior of Duplex Stainless Steels. Materials 2014, 7, 5268-5304.

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