About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Refractory Metallic Materials
|
| Presentation Title |
Ultra-High Preheating Enables Microstructural Engineering of Pure Tungsten by Electron Beam Powder Bed Fusion |
| Author(s) |
Kenta Yamanaka, Nanato Sato, Yumeka Suzuki, Manami Mori, Satoshi Ono, Akimine Hatsuda, Takashi Satoh, Hironobu Manabe |
| On-Site Speaker (Planned) |
Kenta Yamanaka |
| Abstract Scope |
Tungsten is a critical material for plasma-facing components in fusion reactors; however, its additive manufacturing is significantly challenged by its high melting point and intrinsic brittleness. While previous studies have reported that powder bed preheating can reduce crack density, tungsten components, particularly those fabricated by laser beam powder bed fusion, still exhibit cracking. In this study, we leveraged state-of-the-art electron beam technology and improved thermal insulation to employ an ultra-high preheating temperature of approximately 1400 °C using a JEOL JAM-5200EBM electron beam powder bed fusion (EB-PBF) printer. This approach enabled us to clarify the process window for producing crack-free components. Moreover, the remarkably enhanced preheating increased flexibility in microstructural engineering such as the manipulation of strain accumulation (a key factor leading to cracking susceptibility) and columnar-to-equiaxed transition. Our results successfully demonstrate the fabrication of crack-free pure tungsten components with tailored microstructures. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Solidification |