PSI - Issue 38

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2021) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 38 (2022) 149–158

FATIGUE DESIGN 2021, 9th Edition of the International Conference on Fatigue Design Effect of laser scan pattern in laser powder bed fusion process : The case of 316L stainless steel Hugo Roirand a,b,c , Benoit Malard a , Anis Hor b , Nicolas Saintier c

a CIRIMAT, Université de Toulouse, INPT, UPS – CNRS UMR 5085 b ISAE-SUPAERO; ICA,, Université de Toulouse – CNRS UMR 5312 c I2M, Arts et métiers ParisTech – CNRS UMR 5295

© 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2021 Organizers Abstract Recent developments in additive manufacturing technologies allows generating different type of microstructure by modifying the additive manufacturing parameters. Indeed, with the laser powder bed fusion process, the laser power, energy density or laser scan strategies are such of parameters which affect size, morphology and orientations of grains. This allows to build microstructures which were no accessible with conventional processes. Furthermore, the control of laser scan strategies allows to significantly reducing the size and density of defects inherent to the process (gas pores, lack of fusion). These advances make it possible to study the role of microstructure and defect on fatigue crack initiation behaviour for additive manufactured materials. This paper aims to take this opportunity for studying the 316L stainless steel built with the laser powder bed fusion process. © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2021 Organizers Keywords: Laser powder bed fusion (LPBF) ; 316L stainless steel ; microstructure generation ; fatigue crack initiation 1. Introduction Stainless steels (SS) are widely used in industry for their relatively good mechanical resistance and corrosion behaviour in relation to their low cost (Colombié, 1991). With the recent development of additive manufacturing (AM) technologies, these materials are experiencing a new interest. In some critical applications, nuclear industry for he Authors. Published by ELSEVIER B.V.

2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2021 Organizers

2452-3216 © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Fatigue Design 2021 Organizers 10.1016/j.prostr.2022.03.016