PSI - Issue 54

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 54 (2024) 256–263

© 2023 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 ICSI 2023 organizers © 2023 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 ICSI 2023 organizers Keywords: Maraging steel, residual stresses, SLM 1. Introduction Residual stresses in additively manufactured parts are a major concern, primarily due to their impact on final product quality. External manifestations include deformations of printed components and cracks, which occur when residual stresses exceed the yield strength [60]. The geometry of the printed object also plays a role, with some shapes This contribution investigates the effects of process parameter changes on residual stresses in printed maraging steel X3NiCoMoTi18-9-5. A series of samples was produced using direct metal laser sintering (DMLS) on an EOS M290 machine. Printed components typically exhibit undesirable tensile residual stresses (RS), which can lead to deformations and cracks. To reduce RS, different parameter sets were tested. The following parameters were tested: change of the build strategy from stripes to chessboard, time homogenization, change of the complex VED parameter, thermal treatment modification, and building platform preheating change. Residual stress evaluation was performed using the drilling method in subsurface area and X-ray diffraction in the surface area. © 2023 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 ICSI 2023 organizers Keywords: Maraging steel, residual stresses, SLM 1. Introduction Residual stresses in additively manufactured parts are a major concern, primarily due to their impact on final product quality. External manifestations include deformations of printed components and cracks, which occur when residual stresses exceed the yield strength [60]. The geometry of the printed object also plays a role, with some shapes International Conference on Structural Integrity 2023 (ICSI 2023) Improving of mechanical properties of printed maraging steel Ivana Zetková a *, Petr Thurnwald a , Petr Bohdan a , Karel Trojan b , Jr., Jiří Čapek b , Nikolaj Ganev b , Miroslav Zetek a , Miloslav Kepka a , Miloslav Kepka a , Šárka Houdková c a Faculty of Mechanical Engineering, University of West Bohemia, Univerzitni 2732/8, 301 00 Pilsen, Czech Republic b Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague; Trojanova 13, 120 00 Prague, Czech Republic c Research and Testing Institute Plzeň s.r.o. Tylova 1581/46, 301 00 Pilsen, Czech Republic International Conference on Structural Integrity 2023 (ICSI 2023) Improving of mechanical properties of printed maraging steel Ivana Zetková a *, Petr Thurnwald a , Petr Bohdan a , Karel Trojan b , Jr., Jiří Čapek b , Nikolaj Ganev b , Miroslav Zetek a , Miloslav Kepka a , Miloslav Kepka a , Šárka Houdková c a Faculty of Mechanical Engineering, University of West Bohemia, Univerzitni 2732/8, 301 00 Pilsen, Czech Republic b Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague; Trojanova 13, 120 00 Prague, Czech Republic c Research and Testing Institute Plzeň s.r.o. Tylova 1581/46, 301 00 Pilsen, Czech Republic Abstract Abstract This contribution investigates the effects of process parameter changes on residual stresses in printed maraging steel X3NiCoMoTi18-9-5. A series of samples was produced using direct metal laser sintering (DMLS) on an EOS M290 machine. Printed components typically exhibit undesirable tensile residual stresses (RS), which can lead to deformations and cracks. To reduce RS, different parameter sets were tested. The following parameters were tested: change of the build strategy from stripes to chessboard, time homogenization, change of the complex VED parameter, thermal treatment modification, and building platform preheating change. Residual stress evaluation was performed using the drilling method in subsurface area and X-ray diffraction in the surface area.

* Ivana Zetkova. Tel.: +420 731 060 406; fax: +420 377 638 788 E-mail address: zetkova@fst.zcu.cz * Ivana Zetkova. Tel.: +420 731 060 406; fax: +420 377 638 788 E-mail address: zetkova@fst.zcu.cz

2452-3216 © 2023 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 ICSI 2023 organizers 2452-3216 © 2023 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 ICSI 2023 organizers

2452-3216 © 2023 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 ICSI 2023 organizers 10.1016/j.prostr.2024.01.081