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Initiation and Growth of Short Cracks during Cycling in an Aged Superduplex Stainless Steel
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Initiation and Growth of Short Cracks during Cycling in an Aged Superduplex Stainless Steel

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Abstract:

The kinetics of short crack growth during cycling has been studied in a superduplex stainless steel in aged condition. After few cycles, slip lines appear distributed in both phases but the preferred phase for microcrack nucleation is the ferrite. Contrary to the exponential behavior observed in the as-received material, the growth rate of microcracks in aged condition follows a rather linear law. Internal dislocation structures were studied in the near surface region; microbands that sometimes extend over several grains were found at approximately 45º of the tensile axis on ferrite grains. The origin of the microbands has been analyzed and correlated with the microcracks.

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Periodical:

Key Engineering Materials (Volume 465)

Pages:

411-414

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.465.411

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Online since:

January 2011

Authors:

M. Balbi, S. Hereñú, Ingrid Proriol Serre, Jean Bernard Vogt, A.F. Armas, I. Alvarez-Armas

Keywords:

Aged Material, Duplex Stainless Steel, Low Cycle Fatigue, Short Cracks Initiation, Short Cracks Propagation

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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References

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