| About this Abstract |
| Meeting |
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
|
| Symposium
|
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
|
| Presentation Title |
Compositionally Graded Transition from Tungsten to Ferritic-martensitic Steels via Directed Energy Deposition |
| Author(s) |
Deniz Ebeperi, Tim Graening, Ying Yang, Yutai Katoh, Ibrahim Karaman |
| On-Site Speaker (Planned) |
Ibrahim Karaman |
| Abstract Scope |
Nuclear fusion reactors utilize W and W-based alloys as plasma facing components, which require joining
into steel cooling structures based on the state-of-art divertor designs. Direct joining between W and
steels lead to formation of brittle intermetallics. Joining with filler alloys are not compatible for high
temperature applications as the microstructure may degrade and promote a critical failure. Directed
energy deposition technique enables deposition of multiple pre-alloy or elemental powders
simultaneously, in a layer-by-layer fashion, with a precise control of the composition to avoid formation
of intermetallic or detrimental phases. In addition, its ability to fabricate compositionally graded
transitions reduces the coefficient of thermal expansion mismatch between adjacent interlayer alloys. In
this study, we demonstrated a framework to optimize the processing parameters for each alloy, generated
processability maps and successfully fabricated a dense, multilayered, linear compositional gradient from
W to Gr91 steel, using V-based and Fe-based alloys as transition elements. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |