| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
A-107: Fabrication of γ/γ’-strengthened Co-Al-W Alloys by Direct Laser Deposition |
| Author(s) |
Pyuck-Pa Choi, Boryung Yoo |
| On-Site Speaker (Planned) |
Pyuck-Pa Choi |
| Abstract Scope |
Co-Al-W-based alloys strengthened by a two-phase γ/γ’-microstructure have been researched for more than a decade due to their excellent high-temperature properties, such as creep and hot corrosion resistance. However, until now research on these promising alloys have mostly focused on samples fabricated by conventional casting processes and only very little is known about the structure-property relationships of additively manufactured parts.
Here we report on γ/γ’-strengthened Co-Al-W alloys fabricated using the direct laser deposition (DLD) process. Careful control of the DLD parameters yielded thin-walled samples of more than 15 mm in height without the occurrence of hot-cracking. Upon increasing the laser power, we could observe the formation of γ’-precipitates in as-built samples. As-built and post heat-treated samples were characterized on various length scales, using X-ray diffraction, electron microscopy, and atom probe tomography, in order to further to elucidate the relationship between the microstructure and the high-temperature properties. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |