PSI - Issue 42

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ

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Procedia Structural Integrity 42 (2022) 992–999

© 2022 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 23 European Conference on Fracture – ECF23 Abstract Recent studies have reached some antagonist conclusions regarding the benefits of post-processing treatments on fatigue performance of AlSi10Mg aluminium alloy processed by laser powder bed fusion (LPBF). Thus, this paper aims to explore the triangular relationship between post-processing routes, microstructure, and cyclic properties. In order to reach this goal, uniaxial strain-controlled fatigue tests are conducted on smooth specimens in low-cycle and high-cycle fatigue regimes for five different material states, encompassing the as-built condition, T6 condition, stress relief at a standard temperature, stress relief at a non standard temperature, and stress relief at a non-standard temperature followed by hot isostatic pressure. It has been found that the microstructural transformations associated with the stress relief at both the standard and non-standard temperatures had a beneficial effect on fatigue strength of AlSi10Mg aluminium alloy processed by LPBF. Furthermore, the hot isostatic pressure treatment did not alter the fatigue performance. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 Keywords: AlSi10Mg aluminium alloy; laser-beam powder bed fusion; post-processing heat treatment; low-cycle fatigue 1. Introduction Aluminium alloys have proven to be technically superior materials for a wide range of engineering applications, due to their high strength, low density, good fracture toughness, and attractive cost (Heinz, 2000). These superior r B.V. 23 European Conference on Fracture - ECF23 Effect of post-processing heat treatment on cyclic plastic behaviour of AlSi10Mg aluminium alloy processed by LPBF R. Fernandes a , J. de Jesus a,b, *, R. Branco a , L.P. Borrego a,c , J.D. Costa a , J.A.M. Ferreira a a University of Coimbra, CEMMPRE, Department of Mechanical Engineering, Coimbra, 3030-788 Coimbra, Portugal b Department of Mechanical Engineering, Lisbon Polytechnic - ISEL, Rua Conselheiro Emídio Navarro 1, 1959-007 Lisboa, Portugal c Department of Mechanical Engineering, Coimbra Polytechnic - ISEC, Rua Pedro Nunes, Quinta da Nora, 3030-199 Coimbra, Portugal

* Corresponding author. Tel.: +351-239790700; fax: +351- 239403407. E-mail address: joel.jesus@uc.pt

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23

2452-3216 © 2022 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 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.125