Abstract
Fast characterization of high and very high-cycle fatigue properties is necessary in order to enable the optimization of process parameter in additive manufacturing. In order to explore the possibilities in accelerated fatigue testing, two fast characterization methods were applied on Ti-6Al-4V samples produced using LPBF (Laser Powder Bed Fusion) process. In a previous work, ultrasonic fatigue machine enabling fatigue testing at 20 kHz was used to study the very-high cycle fatigue resistance of Ti-6Al-4V-LPBF. In this article, the fatigue limit of Ti-6Al-4V-LPBF is estimated using self-heating testing. To study the interactions between the material and the accelerated testing method, fatigue tests are carried out on different grades of Ti-6Al-4V-LPBF difering 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. Moreover, the effect of testing frequency and an initial plastic strain is also studied.
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