PSI - Issue 65

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2024) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2024) 000–000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 65 (2024) 302–309

The 17th International Conference on MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS 2023) Influence of scanning strategy and hatch distance on porosity and mechanical characteristics of 316L stainless steel produced by laser powder bed fusion Boris Voloskov a* , Tatiana Mishurova b , Stanislav Evlashin a , Denis Firsov a , Giovanni Bruno b,c , Ivan Sergeichev a a Skolkovo Institute of Science and Technology, Center for Materials Technologies, Bolshoy Boulevard 30, bld. 1, Moscow 121205, Russia b Bundesanstalt für Materialforschung und –prüfung (BAM; Federal Institute for Materials Research and Testing), Unter den Eichen 87, Berlin 12205, Germany c Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Straße 24/25, Potsdam 14476, Germany The 17th International Conference on MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS 2023) Influence of scanning strategy and hatch distance on porosity and mechanical characteristics of 316L stainless steel produced by laser powder bed fusion Boris Voloskov a* , Tatiana Mishurova b , Stanislav Evlashin a , Denis Firsov a , Giovanni Bruno b,c , Ivan Sergeichev a a Skolkovo Institute of Science and Technology, Center for Materials Technologies, Bolshoy Boulevard 30, bld. 1, Moscow 121205, Russia b Bundesanstalt für Materialforschung und –prüfung (BAM; Federal Institute for Materials Research and Testing), Unter den Eichen 87, Berlin 12205, Germany c Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Straße 24/25, Potsdam 14476, Germany The effect of scanning strategies and hatch distances on the porosity and mechanical properties of 316L stainless steel produced by laser powder bed fusion (PBF-LB) is studied. Two scanning strategies were analyzed along with three hatch distances (50 µm, 80 µm, and 110 µm). Using X-ray computed tomography (XCT), the study revealed different defect distributions: 90° alternating hatch scanning strategy resulted in a higher number of lack of fusion defects, while the chessboard strategy produced smaller, more uniformly distributed gas pores. The optimal hatch distance of 80 µm was found to minimize porosity and maximize tensile strength for both strategies. Mechanical testing supported these findings, showing that specimens printed with an 80 µm hatch distance exhibited better mechanical characteristics. This study highlights the critical role of scanning parameters in the quality and reliability of additively manufactured parts. © 2024 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 MRDMS 2023 organizers Keywords: laser powder bed fusion (PBF-LB); additive manufacturing (AM); porosity; mechanical properties The effect of scanning strategies and hatch distances on the porosity and mechanical properties of 316L stainless steel produced by laser powder bed fusion (PBF-LB) is studied. Two scanning strategies were analyzed along with three hatch distances (50 µm, 80 µm, and 110 µm). Using X-ray computed tomography (XCT), the study revealed different defect distributions: 90° alternating hatch scanning strategy resulted in a higher number of lack of fusion defects, while the chessboard strategy produced smaller, more uniformly distributed gas pores. The optimal hatch distance of 80 µm was found to minimize porosity and maximize tensile strength for both strategies. Mechanical testing supported these findings, showing that specimens printed with an 80 µm hatch distance exhibited better mechanical characteristics. This study highlights the critical role of scanning parameters in the quality and reliability of additively manufactured parts. © 2024 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 MRDMS 2023 organizers Keywords: laser powder bed fusion (PBF-LB); additive manufacturing (AM); porosity; mechanical properties © 2024 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 MRDMS 2023 organizers Abstract Abstract

* Corresponding author. Tel.; +7-965-148-0211 E-mail address: boris.voloskov@skoltech.ru * Corresponding author. Tel.; +7-965-148-0211 E-mail address: boris.voloskov@skoltech.ru

2452-3216 © 2024 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 MRDMS 2023 organizers 2452-3216 © 2024 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 MRDMS 2023 organizers

2452-3216 © 2024 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 MRDMS 2023 organizers 10.1016/j.prostr.2024.11.045