About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
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Additive Manufacturing of Titanium-based Materials: Processing, Microstructure and Material Properties
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Presentation Title |
Controlling Aluminum Vaporization in EBM Ti-6Al-4V through Scan Strategy |
Author(s) |
Katie O'Donnell, Maria J. Quintana, Christopher Ledford, Michael Kirka, Peter C. Collins |
On-Site Speaker (Planned) |
Katie O'Donnell |
Abstract Scope |
High temperature processing of titanium-aluminum alloys, particularly electron beam-based processes, leads to the preferential vaporization of aluminum from the surface of melt pools. Given that electron beam processes occur in vacuum, the aluminum vaporization is largely controlled by the temperature of the melt pool, however, additional factors can alter the rate and amount of aluminum that is lost. These additional factors include the time at temperature, the relative sizes of the molten pools, and the pressure, either the ambient pressure in the vacuum chamber, or the local pressure directly above a molten pool. Energy dispersive spectroscopy analysis of samples produced through three different scan strategies have shown that those strategies which use point-melting, as opposed to the more traditional linear scanning strategy, experience greater aluminum loss. Alteration of the scan strategy within a single build was then used to locally control composition, providing an avenue for writing in the composition. |