Abstract
Mechanical properties of duplex stainless steels (DSSs) are strongly dependent on their microstructure and micromechanical behavior of the constitutive phases. The present work has investigated the growth behavior of fatigue crack in two DSSs, SAF 2507 and SAF 2906, having a different hardness ratio between the constitutive austenite and ferrite. By microstructural examination in SEM under in situ loading and also after ex situ loading, the slip activities, the development of localized cyclic plasticity and the propagation of the fatigue crack in an austenite-dominant region in the respective steel were closely followed. The growth of cracks and formation of secondary cracks were correlated to slip heterogeneities within the same grain under cyclic loading and localization of cyclic plastic strains. More profound localization of cyclic plastic strains were observed in the crack tip region in SAF 2507 than in SAF 2906, likely attributed to a softer austenite in SAF 2507.
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Peng, R.L., Chai, GC., Johansson, S., Eriksson, R. (2014). SEM Study of Fatigue Crack Growth Behavior in Duplex Stainless Steels. In: TMS 2014: 143rd Annual Meeting & Exhibition. Springer, Cham. https://doi.org/10.1007/978-3-319-48237-8_76
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DOI: https://doi.org/10.1007/978-3-319-48237-8_76
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48593-5
Online ISBN: 978-3-319-48237-8
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