PSI - Issue 57

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ScienceDirect

Procedia Structural Integrity 57 (2024) 53–60 Structural Integrity Procedia 00 (2023) 000–000 Structural Integrity Procedia 00 (2023) 000–000

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© 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 the scientific committee of the Fatigue Design 2023 organizers Abstract Fast characterization of high and very high-cycle fatigue properties is necessary in order to enable the optimization of process parameter in additive manufacturing. In order to explore the possibilities in accelerated fatigue testing, two fast characterization methods were applied on Ti-6Al-4V samples produced using LPBF (Laser Powder Bed Fusion) process. In a previous work, ultrasonic fatigue machine enabling fatigue testing at 20 kHz was used to study the very-high cycle fatigue resistance of Ti-6Al 4V-LPBF. In this article, the fatigue limit of Ti-6Al-4V-LPBF is estimated using self-heating testing. To study the interactions between the material and the accelerated testing method, fatigue tests are carried out on di ff erent grades of Ti-6Al-4V-LPBF di ff ering by their microstructure or their porosity. Three grades have the same microstructure but di ff erent porosity levels and three grades have di ff erent microstructures with the same porosity. Moreover, the e ff ect of testing frequency and an initial plastic strain is also studied. © 2023 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 the scientific committee of the Fatigue Design 2023 organizers. Keywords: Additive Manufacturing; Self-heating testing; Microstructure; Porosity; Ti-6Al-4V Fatigue Design 2023 (FatDes 2023) Self-Heating Testing of Additively Manufactured Ti-6Al-4V With Di ff erent Microstructures and Porosity Levels. Gre´goire Brot a,b, ∗ , Vincent Bonnand a , Ve´ronique Favier b , Imade Koutiri b , Didier Pacou a , Corinne Dupuy b , Fabien Lefebvre c a DMAS, ONERA, Universite´ Paris Saclay, 29 Avenue de la Division Leclerc, Chaˆtillon, France b PIMM, Arts et Metiers Institute of Technology, CNRS, Cnam, HESAM University, 151 Boulevard de l’Hopital, Paris, France c CETIM, 52 Avenue Fe´lix Louat, Senlis, France Abstract Fast characterization of high and very high-cycle fatigue properties is necessary in order to enable the optimization of process parameter in additive manufacturing. In order to explore the possibilities in accelerated fatigue testing, two fast characterization methods were applied on Ti-6Al-4V samples produced using LPBF (Laser Powder Bed Fusion) process. In a previous work, ultrasonic fatigue machine enabling fatigue testing at 20 kHz was used to study the very-high cycle fatigue resistance of Ti-6Al 4V-LPBF. In this article, the fatigue limit of Ti-6Al-4V-LPBF is estimated using self-heating testing. To study the interactions between the material and the accelerated testing method, fatigue tests are carried out on di ff erent grades of Ti-6Al-4V-LPBF di ff ering by their microstructure or their porosity. Three grades have the same microstructure but di ff erent porosity levels and three grades have di ff erent microstructures with the same porosity. Moreover, the e ff ect of testing frequency and an initial plastic strain is also studied. © 2023 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 the scientific committee of the Fatigue Design 2023 organizers. Keywords: Additive Manufacturing; Self-heating testing; Microstructure; Porosity; Ti-6Al-4V Fatigue Design 2023 (FatDes 2023) Self-Heating Testing of Additively Manufactured Ti-6Al-4V With Di ff erent Microstructures and Porosity Levels. Gre´goire Brot a,b, ∗ , Vincent Bonnand a , Ve´ronique Favier b , Imade Koutiri b , Didier Pacou a , Corinne Dupuy b , Fabien Lefebvre c a DMAS, ONERA, Universite´ Paris Saclay, 29 Avenue de la Division Leclerc, Chaˆtillon, France b PIMM, Arts et Metiers Institute of Technology, CNRS, Cnam, HESAM University, 151 Boulevard de l’Hopital, Paris, France c CETIM, 52 Avenue Fe´lix Louat, Senlis, France

1. Introduction 1. Introduction

Ti-6Al-4V alloy printed using Laser Powder Bed Fusion (LPBF) process is a promising materials-process com bination with potential applications as structural parts. However, the durability assessment of structures produced with additive manufacturing processes still requires many investigations. Indeed, many LPBF process parameters can influence the process-induced porosity or microstructure and thus their high-cycle fatigue behavior (Kumar and Ra mamurty (2020)). In this context, a rapid determination of these properties is mandatory in order to optimize process parameters with respect to fatigue properties, especially in high and very-high cycle fatigue (VHCF) domains. In Brot Ti-6Al-4V alloy printed using Laser Powder Bed Fusion (LPBF) process is a promising materials-process com bination with potential applications as structural parts. However, the durability assessment of structures produced with additive manufacturing processes still requires many investigations. Indeed, many LPBF process parameters can influence the process-induced porosity or microstructure and thus their high-cycle fatigue behavior (Kumar and Ra mamurty (2020)). In this context, a rapid determination of these properties is mandatory in order to optimize process parameters with respect to fatigue properties, especially in high and very-high cycle fatigue (VHCF) domains. In Brot

∗ Corresponding author. E-mail address: gregoire.brot@ensam.eu ∗ Corresponding author. E-mail address: gregoire.brot@ensam.eu

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 the scientific committee of the Fatigue Design 2023 organizers 10.1016/j.prostr.2024.03.007 2210-7843 © 2023 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 the scientific committee of the Fatigue Design 2023 organizers. 2210-7843 © 2023 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 the scientific committee of the Fatigue Design 2023 organizers.