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HomeKey Engineering MaterialsKey Engineering Materials Vol. 982Influence of Hydrogen on the Failure Mechanism of...

Influence of Hydrogen on the Failure Mechanism of Standard Duplex Stainless Steel X2CrNiMoN22-5-3 Exposed to Corrosion Fatigue

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Abstract:

IIn a geothermal environment, cathodic protection is employed to improve resistance against corrosion fatigue. However, during the cathodic reactions under applied potential, hydrogen is generated and assimilated, leading to a reduced lifetime expectancy of high-alloyed steels. The corrosion fatigue mechanism of a standard duplex stainless steel X2CrNiMoN22-5-3 (1.4462) specimen loaded with hydrogen was studied in a corrosion chamber specifically designed for the purpose, surrounded by the electrolyte of the Northern German Basin at 369 K. The microstructural reactions resulting in hydrogen incorporation significantly decrease the number of cycles to failure of the specimen. This reduction is attributed to hydrogen enhancing crack propagation and causing early failure, primarily due to the deterioration of the mechanical properties of the ferritic phase rather than corrosion reactions or corrosive degradation.

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Periodical:

Key Engineering Materials (Volume 982)

Pages:

27-32

DOI:

https://doi.org/10.4028/p-QJf7Bl

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Online since:

July 2024

Authors:

Marcus Wolf, Anja Pfennig*

Keywords:

Corrosion, Corrosion Fatigue, Duplex Steel, Hydrogen

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© 2024 Trans Tech Publications Ltd. All Rights Reserved

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