Microstructure mastering and fatigue behavior of duplex stainless steel obtained with laser powder bed fusion

Microstructure mastering and fatigue behavior of duplex stainless steel obtained with laser powder bed fusion


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Abstract. Microstructure and mechanical behavior of duplex stainless steels (DSS) are well known when elaborated with conventional processes. Nowadays, many studies aimed to characterize this material for additive manufacturing (AM) processes like laser powder bed fusion (LPBF) [1], [2]. The as-built LPBF microstructure of this alloy is totally ferritic [1]. Heat treatments are therefore necessary to recover the duplex microstructure. These heat treatments need to be optimized. The effects of annealing heat treatments on the microstructure and mechanical behavior of DSS are now known [2], but the consequences on its fatigue strength need to be explored. In this study, firstly, the duplex microstructure will be controlled by heat treatments to obtain austenitic phase with different grain morphology. Then, the influence of microstructure on tensile high cycle fatigue behavior will be investigated. As a result, a microstructure with coarser austenite grains has no effect on fatigue behavior compared to the fully ferritic As-built material whereas the finer microstructure allows an improvement. Even if there is austenite phase improving the material ductility, fatigue damage initiation is always due to pore defects.

LPBF, Microstructure, Fatigue Behavior, Duplex SAF 2507

Published online 4/24/2024, 10 pages
Copyright © 2024 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: PIRAS Maxime, HOR Anis, CHARKALUK Eric, Microstructure mastering and fatigue behavior of duplex stainless steel obtained with laser powder bed fusion, Materials Research Proceedings, Vol. 41, pp 290-299, 2024

DOI: https://doi.org/10.21741/9781644903131-33

The article was published as article 33 of the book Material Forming

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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