About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
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Additive Manufacturing: Processing, Microstructure and Material Properties of Titanium-based Materials
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Presentation Title |
Examining the Role of Parent Grain Orientations on the Texture and Physical Properties of Additively Manufactured Ti 6-4 Alloys |
Author(s) |
Michael Hjelmstad, Pat Trimby |
On-Site Speaker (Planned) |
Michael Hjelmstad |
Abstract Scope |
It is well established that additively manufactured Ti 6-4 grows from the melt with cubic beta-grains building epitaxially on underlying beta-grains. These beta-grains typically have a strong <100> texture aligned with the build direction and upon cooling, largely transform to the hexagonal alpha-phase. Using electron backscatter diffraction (EBSD) data of the final alpha-dominated microstructure, recent developments have made it possible to reconstruct the parent grain orientations based on the crystallographic relationship between parent beta grains and daughter alpha variants.
Here we present a new, commercially available technique for the rapid and effective reconstruction of parent microstructures and demonstrate the application to some electron powder bed fusion (ePBF) manufactured Ti 6-4 samples. The results indicate the importance of the prior beta-grain microstructure, not only for its control of the resulting alpha-texture, but also in determining the elastic and deformation properties of the final Ti 6-4 sample. |