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
Author
BROT, Grégoire KOUTIRI, Imade BONNAND, Vincent DUPUY, Corinne RANC, NicolasAIMEDIEU, PatrickLEFEBVRE, FabienHAUTEVILLE, Robin FAVIER, VéroniqueAbstract
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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