AMB2025-03 High-Cycle Rotating Bending Fatigue Tests of PBF-L Ti-6Al-4V

Specimens from one build of laser powder bed fusion (PBF-L) titanium alloy (Ti-6Al-4V) were split equally into two heat treatment conditions. The first condition is a non-standard hot isostatic pressing (HIP) heat treatment (800 °C, 2 h, argon pressure of 200 MPa, approximately 12 °C/min cooling rate), which will be referred to as 800HIP. The second condition is the same heat treatment but in a vacuum furnace with a partial pressure of argon (75 mTorr), and will be referred to as 800VAC. All fatigue specimens were vertically oriented during PBF-L, then after post-processing was completed, the specimens were machined and polished to remove the as-built surface roughness and PBF-LB contour. Approximately 25 specimens per condition were tested in high-cycle fully reversed 4-point rotating bending fatigue (RBF, R = -1) according to ISO 1143.
Calibration data given for both conditions will include: detailed build parameters, heat treatment details (time, temperature, and chamber pressure), solid chemistry, surface roughness measurements of the gauge section of fatigue specimens, strain measured in gauge section of fatigue specimens via x-ray diffraction (XRD), 2D maps of grain size and morphology via scanning electron microscopy (SEM), 2D crystallographic texture via electron backscatter diffraction (EBSD), pore size and spatial distribution via x-ray computed tomography (XCT), and quasi-static tensile properties according to ASTM E8. All fatigue data (S-N curve) for the 800HIP condition will also be given as calibration data.