About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Refractory High Entropy Alloys and Ceramics
|
| Presentation Title |
Thermal Control During Laser Powder Bed Fusion of Pure Tungsten Through Optimization of Follower Beam |
| Author(s) |
Daniel R. Sinclair, Amaranth Karra, Bryan Ebler |
| On-Site Speaker (Planned) |
Daniel R. Sinclair |
| Abstract Scope |
The use of tungsten and its alloys in engineering applications has historically been limited by poor formability and machinability. Using powder-based additive manufacturing (AM), it is now feasible to manufacture complex tungsten parts, but printing is still complicated by cracking, which is promoted by the high cooling rates and tendency for oxygen pickup common in laser AM. To prevent cracking, thermal gradients and the development of residual stress during laser melting must be carefully managed. A commercial two-laser powder bed fusion (PBF) system has thus been used here to print pure tungsten, with the goal of decreasing thermal gradients around the melt pool. In this preliminary work, follower laser parameters (including power, follow distance, and spot size) were optimized based on a combination of experimental depositions with finite element analysis of time-resolved thermal and stress profiles. |