Abstract
Ti-6Al-4V is of high value in biomedical, aerospace, and industrial sectors and is ideal for additive manufacturing (AM) because of its poor machinability. In electron beam powder bed fusion of Ti-6Al-4V, a raster scan is commonly used and often results in porosity that is detrimental to the fatigue strength. In this paper, we demonstrate that spot melting can significantly minimize porosity but produces a coarser microstructure compared to raster melting. Process parameters can be optimized to achieve minimal porosity with tailored microstructures. A finite element method was used to rationalize these observations.
Original language | English |
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Article number | 100962 |
Journal | Materials Today Communications |
Volume | 24 |
DOIs | |
State | Published - Sep 2020 |
Funding
This research was supported by the Department of Energy (DOE) Office of Energy Efficiency and Renewable Energy (EERE), Advanced Manufacturing Office and used resources at the Manufacturing Demonstration Facility, a DOE-EERE User Facility at Oak Ridge National Laboratory. Research was sponsored under Contract DE-AC05-00OR22725 with UT-Battelle, LLC. The authors would also like to acknowledge Abigail Barnes of ORNL for her diligent proofreading during the preparation of this manuscript. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to the results of this federally sponsored research, in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).
Keywords
- Additive manufacturing
- Electron beam melting
- Porosity
- Spot melting
- Ti-6Al-4V