Microstructure and defect sensitivities in the very high-cycle fatigue response of Laser Powder Bed Fused Ti–6Al–4V
Article dans une revue avec comité de lecture
Auteur
BROT, Grégoire KOUTIRI, Imade BONNAND, Vincent DUPUY, Corinne RANC, NicolasAIMEDIEU, PatrickLEFEBVRE, FabienHAUTEVILLE, Robin FAVIER, VéroniqueRésumé
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. These grades were generated using different LPBF process parameters and different thermal
post-treatments allowing to separately investigate the sensitivity to microstructure and porosity variations. It
was found that both material features highly influenced the VHCF properties of LPBF-Ti-6Al-4V revealing the
sensitivity to these features. Furthermore, the largest defect (pore or grain) controls fatigue crack initiation.
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Communication avec acte; ;DUPUY, Corinne; ; RANC, Nicolas; KOUTIRI, Imade; FAVIER, Véronique (Elsevier, 2022-03-17)
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 ...
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Article dans une revue avec comité de lectureTRAORE, Socona; KOUTIRI, Imade; SCHNEIDER, Matthieu; ; DUPUY, Corinne; ; ; 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 lecture; ; ; ; ; ;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 lecture;PESSARD, Etienne; KOUTIRI, Imade; ; ; SAINTIER, Nicolas; (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; ; RANC, Nicolas; CASTELNAU, Olivier; ; ; FAVIER, Véronique; ; (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 ...