| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Additive Manufacturing of Metals: Complex Microstructures and Architecture Design
|
| Presentation Title |
Secondary Orientation Preference of Ni-based Superalloy Single Crystals Produced via Electron Beam Melting |
| Author(s) |
Patxi Fernandez-Zelaia, Michael M Kirka, Yousub Lee, Andres Marquez Rossy, Sebastien Dryepondt |
| On-Site Speaker (Planned) |
Patxi Fernandez-Zelaia |
| Abstract Scope |
Additive manufacturing (AM) enables site specific microstructure control which can be used to optimize the design of high performance components. In recent years a few groups have reported on the fabrication of single crystal Ni-based superalloys via powder bed electron beam melting. While the build direction exhibits a [001] preference, typical for cubic metals, these works all report a strong [011] secondary orientation preference normal to the line scan direction. The physical explanation for this anomalous observation is not yet well understood. In this talk we present an experimental study resulting in the fabrication of single crystals from two commercially available Ni-based superalloy powders. A number of experiments were performed to perturb the printing dynamics to understand the secondary orientation preference. We find that there are two driving forces controlling the secondary orientation; one which preserves epitaxial crystallographic growth and a second driven by the line scan sequence. |