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HomeMaterials Science ForumMaterials Science Forum Vol. 879Effect of Secondary Phases Precipitation on...

Effect of Secondary Phases Precipitation on Corrosion Resistance of Duplex Stainless Steels

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Abstract:

Duplex Stainless steels (DSS) are biphasic austeno-ferritic steels in which the best combination of mechanical and corrosion resistance properties is achieved for almost equal volume fraction of the phases. These steels are classified according to their pitting corrosion resistance, assessed by the PREN index (Pitting Resistance Equivalent Number) which, although qualitatively, is widely employed as comparison. The present work is aimed to study the pitting resistance of four DSS grades (SAF 2101, 2304, 2205 and 2507) in the as-received condition and after isothermal aging in the critical range 750°C-900°C, to highlight the effect of secondary phases precipitation on the corrosion behavior. The materials were potentiodynamically tested in artificial seawater (pH7) at room temperature and the corresponding Critical Pitting Temperatures (CPT) were determined according to ASTM G150. Secondary phase precipitation mainly affected the lean duplex grades whereas the high-alloyed DSS were more stable even if large precipitation occurred.

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Periodical:

Materials Science Forum (Volume 879)

Pages:

1495-1500

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.879.1495

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Online since:

November 2016

Authors:

Luca Pezzato*, Mattia Lago, Katya Brunelli, Marco Breda, Enrico Piva, Irene Calliari

Keywords:

Chi Phase, Critical Pitting Temperature, Duplex Stainless Steel, Nitrides, Pitting Corrosion, Sigma Phase

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© 2017 Trans Tech Publications Ltd. All Rights Reserved

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