| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Additive Manufacturing: Materials, Alloy Development, Microstructure and Properties
|
| Presentation Title |
Mesoscale crystallographic texture control via beam path sequencing in electron beam melting |
| Author(s) |
Patxi Fernandez-Zelaia, Michael M Kirka, Yousub Lee, Sebastien N Dryepondt, Maxim N Gussev |
| On-Site Speaker (Planned) |
Patxi Fernandez-Zelaia |
| Abstract Scope |
Metals additive manufacturing research is often focused on process window identification for avoiding defects and yielding desirable properties. The magnetic lens in electron beam melting fusion processes enables precise spatial-temporal control of the heat source. Prior studies have shown that this control makes possible small scale site specific microstructure manipulation. Design is therefore extended to the microstructure length scale granting overall greater flexibility in engineering and fabricating high performance components. In this presentation we discuss the role of geometry and beam path sequencing in a Ni-based superalloy manufactured via powder bed electron beam melting. Mesoscale morphology and texture are controlled by careful engineering of the melt sequence. Solidification in the build direction, which usually prefers a [001] growth texture, is continuously tilted by control of the heat flux vector. In the extreme case the resulting structure consists of epitaxial columnar crystals with a strong [011] build direction preference. |