PSI - Issue 48

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Procedia Structural Integrity 48 (2023) 238–243

Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023) Experimental investigation of the fatigue crack growth behaviour in SLM additively manufactured 17-4 PH stainless steel specimens Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023) Experimental investigation of the fatigue crack growth behaviour in SLM additively manufactured 17-4 PH stainless steel specimens

America Califano a, *, Flavia Bollino b , Filippo Berto c , Raffaele Sepe a a Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, Fisciano SA 84084, Italy. b De partment of Engineering, Università della Campania “Luigi Vanvitelli”, Via Roma 29, Aversa 81031, Italy. c Sapienza University of Rome, Department of Chemical Engineering, Materials, Environment, Italy. America Califano a, *, Flavia Bollino b , Filippo Berto c , Raffaele Sepe a a Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, Fisciano SA 84084, Italy. b De partment of Engineering, Università della Campania “Luigi Vanvitelli”, Via Roma 29, Aversa 81031, Italy. c Sapienza University of Rome, Department of Chemical Engineering, Materials, Environment, Italy.

© 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 IRAS 2023 organizers Abstract Selective Laser Melting (SLM) and, in general, the additive manufacturing technologies potentially offer numerous advantages to designers and technologists, such as the reduction of the lead-time of new products and the possibility of producing any kind of complex shape. The performance of components made by means of additive manufacturing under cyclic loading is influenced by crack orientation, porosities, residual stresses, heat treatments, corrosion environments etc. In particular, the crack orientation can influence the fatigue crack propagation. For this reason, in this paper, the fatigue crack propagation behaviour of 17-4 PH stainless steel made by SLM under different crack orientations is presented. The tests were carried out using 6.65 mm thick compact C(T) specimens tested at R = 0.1 and with a frequency of 5 Hz. The main objective was to study the effect of the crack orientation on crack-length vs. number of cycles curves. © 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 IRAS 2023 organizers Keywords: Crack propagation; 17-4 PH; crack orientation 1. Introduction The additive manufacturing technologies potentially offer numerous advantages, first and foremost the possibility of producing any kind of complex shape (Gibson et al., (2021)). Selective Laser Melting (SLM) processes are the most popular processes for additive manufacturing of metals. SLM is based on the complete melt and solidification of Abstract Selective Laser Melting (SLM) and, in general, the additive manufacturing technologies potentially offer numerous advantages to designers and technologists, such as the reduction of the lead-time of new products and the possibility of producing any kind of complex shape. The performance of components made by means of additive manufacturing under cyclic loading is influenced by crack orientation, porosities, residual stresses, heat treatments, corrosion environments etc. In particular, the crack orientation can influence the fatigue crack propagation. For this reason, in this paper, the fatigue crack propagation behaviour of 17-4 PH stainless steel made by SLM under different crack orientations is presented. The tests were carried out using 6.65 mm thick compact C(T) specimens tested at R = 0.1 and with a frequency of 5 Hz. The main objective was to study the effect of the crack orientation on crack-length vs. number of cycles curves. © 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 IRAS 2023 organizers Keywords: Crack propagation; 17-4 PH; crack orientation 1. Introduction The additive manufacturing technologies potentially offer numerous advantages, first and foremost the possibility of producing any kind of complex shape (Gibson et al., (2021)). Selective Laser Melting (SLM) processes are the most popular processes for additive manufacturing of metals. SLM is based on the complete melt and solidification of

* Corresponding author. Tel.: +39-089-964070; fax: +39-089-964070. E-mail address : amcalifano@unisa.it * Corresponding author. Tel.: +39-089-964070; fax: +39-089-964070. E-mail address : amcalifano@unisa.it

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 IRAS 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 IRAS 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 IRAS 2023 organizers 10.1016/j.prostr.2023.07.154