Effects of Process Parameters and Process Defects on the Flexural Fatigue Life of Ti-6Al-4V Fabricated by Laser Powder Bed Fusion
The fatigue performance of laser powder bed fusion-fabricated Ti-6Al-4V alloy was investigated using four-point bending testing. Specifically, the effects of keyhole and lack-of-fusion porosities along with various surface roughness parameters, were evaluated in the context of pore circularity and size using 2D optical metallography. Surface roughness of S<sub>a</sub> = 15 to 7 microns was examined by SEM, and the corresponding fatigue performance was found to vary by 10<sup>2</sup> cycles to failure. The S-N curves for the various defects were also correlated with process window examination in laser beam power-velocity (P-V) space. Basquin's stress-life relation was well fitted to the experimental S-N curves for various process parameters except keyhole porosity, indicating reduced importance for LPBF-fabricated Ti-6Al-4V alloy components.
Authors
- L.E. Murr (ORCID: https://orcid.org/0000-0001-5942-8376)
- Shadman Tahsin Nabil (ORCID: https://orcid.org/0000-0002-6299-5053)
- Alex De La Cruz
- Edel Arrieta (ORCID: https://orcid.org/0000-0001-8611-3054)
- Cristian Banuelos (ORCID: https://orcid.org/0009-0004-5138-1103)
- Ryan B. Wicker (ORCID: https://orcid.org/0000-0002-8761-7438)
- Brandon Ramirez
- Francisco R. Medina (ORCID: https://orcid.org/0000-0002-3986-6800)
Institutions
- The University of Texas at El Paso (US)
Publication Details
- Journal
- Materials
- Published
- 2024-09-16
- DOI
- https://doi.org/10.3390/ma17184548
- Citations
- 5
- Primary Topic
- Additive Manufacturing Materials and Processes
- Type
- article
- Field-Weighted Citation Impact
- 1.06
Funders
- National Aeronautics and Space Administration