Designing very high-cycle fatigue specimens of additively manufactured Ti-6Al-4V with different porosities and microstructures
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Résumé
High cycle fatigue properties of material obtained with additive manufacturing (AM) processes such as LPBF (Laser Powder Bed Fusion) remain misunderstood. These properties are complex due to the porous and anisotropic features of AM parts. Moreover, a high number of process parameters can influence the obtained fatigue behavior. In this context, a rapid determination of the high and very high cycle fatigue properties is necessary in order to optimize process parameters with regard to fatigue response. This first work aims to produce test pieces with different porosity rates and microstructures. The processing and post-processing parameters leading to different porosity rates, porosity size distribution and microstructure are determined and presented. In a future work, the fatigue response will be then compare using two accelerated fatigue determination methods: ultrasonic fatigue testing and fatigue limit evaluation through lock-in thermography.
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Article dans une revue avec comité de lectureBROT, Grégoire; KOUTIRI, Imade; BONNAND, Vincent; DUPUY, Corinne; RANC, Nicolas; AIMEDIEU, Patrick; LEFEBVRE, Fabien; HAUTEVILLE, Robin; FAVIER, Véronique (2023)This work aims to analyze the sensitivity of the very high-cycle fatigue behavior of LPBF-Ti-6Al-4V to microstructure and porosity variations. To do so ultrasonic fatigue testing is performed on five grades of LPBF-Ti-6Al-4V. ...
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Article dans une revue avec comité de lectureTRAORE, Socona; KOUTIRI, Imade; SCHNEIDER, Matthieu; RODRIGUES, Julien; DUPUY, Corinne; LEFEBVRE, P.; COSTE, Frédéric; PEYRE, Patrice (Elsevier BV, 2022-11)The effect of gaseous atmosphere during Laser Powder Bed Fusion (L-PBF) was analysed on an Inconel 625 alloy. The bead dimensions, the surface finish, the porosity rate and the resulting microstructure were analysed for ...
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Texture control of 316L parts by modulation of the melt pool morphology in selective laser melting Article dans une revue avec comité de lectureANDREAU, Olivier; PEYRE, Patrice; PENOT, Jean-Daniel; DE TERRIS, Thibaut; DUPUY, Corinne; BAUDIN, Thierry; KOUTIRI, Imade; PESSARD, Etienne; SAINTIER, Nicolas (Elsevier, 2019)In this study, 316L parts were fabricated with the selective laser melting additive layer manufacturing process using unidirectional laser scan to control their texture. The melt pool shape, microstructure and texture of ...
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Article dans une revue avec comité de lectureANDREAU, Olivier; PESSARD, Etienne; KOUTIRI, Imade; PENOT, Jean-Daniel; DUPUY, Corinne; SAINTIER, Nicolas; PEYRE, Patrice (Elsevier, 2019)Metal powder bed fusion techniques can be used to build parts with complex internal and external geometries.Process parameters are optimized in order to obtain parts with low surface roughness and porosity, while maintaining ...
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Article dans une revue avec comité de lectureJACQUEMAIN, Vincent; CHEULEU, Christophe; RANC, Nicolas; CASTELNAU, Olivier; MICHEL, Vincent; VINCI, Doriana; FAVIER, Véronique; MOCUTA, Cristian; THIAUDIERE, Dominique (Crystallography Journals Online, 2024-01)In the energy production and transportation industries, numerous metallic structures may be subjected to at least several billions of cycles, i.e. loaded in the very high cycle fatigue domain (VHCF). Therefore, to design ...