Designing very high-cycle fatigue specimens of additively manufactured Ti-6Al-4V with different porosities and microstructures
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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 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 ...
A competition between the contour and hatching zones on the high cycle fatigue behaviour of a 316L stainless steel: Analyzed using X-ray computed tomography 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 ...
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; KOUTIRI, Imade; PEYRE, Patrice; PENOT, Jean-Daniel; SAINTIER, Nicolas; PESSARD, Etienne; DE TERRIS, Thibaut; DUPUY, Corinne; BAUDIN, Thierry (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 ...
Article dans une revue avec comité de lectureJACQUEMAIN, Vincent; RANC, Nicolas; CHEULEU, Christophe; MICHEL, Vincent; FAVIER, Véronique; CASTELNAU, Olivier; VINCI, Doriana; THIAUDIERE, Dominique; MOCUTA, Christian (Elsevier BV, 2021)Piezo-electric ultrasonic fatigue machines are used to carry out fatigue tests more rapidly than what is possible using other technologies, at a frequency of . The very high cycle fatigue (VHCF) domain can be studied with ...
Microsecond time-resolved x-ray diffraction for the investigation of fatigue behavior during ultrasonic fatigue loading Article dans une revue avec comité de lectureÖRS, Taylan; RANC, Nicolas; PELERIN, Maxime; MICHEL, Vincent; FAVIER, Véronique; CASTELNAU, Olivier; MOCUTA, Christian; THIAUDIERE, Dominique (International Union of Crystallography, 2019)A new method based on time-resolved X-ray diffraction is proposed in order to measure the elastic strain and stress during ultrasonic fatigue loading experiments. Pure Cu was chosen as an example material for the experiments ...