G régoire Brot

DMAS, ONERA, Université Paris Saclay, Châtillon, France & PIMM, Arts et Metiers Institute of Technology, CNRS, Cnam, HESAM University, Paris, France



Accelerated characterization of high-cycle fatigue properties is necessary in order to enable the optimization of parameter of additive manufacturing processes such as LPBF (Laser Powder Bed Fusion). Therefore, two accelerated characterization methods are applied and compared on Ti-6Al-4V samples produced using LPBF process. The first method uses ultrasonic fatigue machine and the second one determines the fatigue limit using self-heating testing. To study the interactions between the material and the accelerated testing methods, fatigue tests are carried out on different grades of Ti-6Al-4V-LPBF differing by their microstructure or their porosity. Three grades have the same microstructure but different porosity levels and three grades have different microstructures with the same porosity. It was found that both material features highly influenced the VHCF properties of LPBF-Ti-6Al-4V revealing the sensitivity of accelerated 20 kHz fatigue tests to these features.


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