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The Fatigue Properties of Duplex Stainless Steels: Role of Microstructure

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Abstract:

The paper analyzes the role of microstructure on the low cycle fatigue behaviour of duplex stainless steels. The alloys are investigated in their as received condition and after ageing at 475°C. The fatigue resistance and the cyclic accommodation of these DSS are strongly controlled by the volume fraction of α and γ "phases which is related to the chemical composition in particular nitrogen. It is shown that DSS with a high fraction of austenite present a good combination of fatigue resistance and cyclic softening especially in the aged condition. The mutual interaction between ferrite and austenite referred to load transfer is beneficial for increasing the fatigue resistance. Alloying with nitrogen appears to be a promising way to master an optimised microstructure leading to high mechanical resistant DSS.

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Periodical:

Key Engineering Materials (Volumes 378-379)

Pages:

101-114

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.378-379.101

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Online since:

March 2008

Authors:

Jean Bernard Vogt

Keywords:

Dislocation Structure, Nitrogen Content, Phase Proportion, Short Crack

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© 2008 Trans Tech Publications Ltd. All Rights Reserved

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