About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Design, Materials, Manufacturing, Challenges and Applications
|
| Presentation Title |
Breaking the Myth of Spherical Powders: Pure Tungsten Manufactured by Electron Beam Powder Bed Fusion (PBF-EB) Using Cost-Effective Powder of Irregular Shape |
| Author(s) |
Ian Crawford, William Sjostrom, Stefan Roos, Carlos Botero, Lidija Stjepanic Peric, Ulf R. Ackelid, Arun R. Balachandramurthi |
| On-Site Speaker (Planned) |
Ian Crawford |
| Abstract Scope |
Tungsten is a candidate for components in fusion reactors owing to its high melting point, thermal conductivity, low sputtering yield, etc. Traditional manufacturing of tungsten is difficult, and thus additive manufacturing has been tried a lot recently. Hot processing with PBF-EB shows particular promise, since the process temperature can be continuously kept above tungsten’s DBTT, preventing the cracks seen in PBF-LB processed tungsten. All previous PBF-EB work has been done with plasma spheroidized (PS) powder which is costly and available from few suppliers. Here, we explore irregular powder made by chemical reduction (CR) which is up to three times less expensive. We compare the PBF-EB process behaviour of CR and PS powders in terms of process temperature, optimum beam scanning settings, spatter, smoke sensitivity and build rate. We also compare the resulting tungsten materials in terms of porosity, chemistry and surface quality. Video material will be used for illustration. |