| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Refractory Metallic Materials
|
| Presentation Title |
A New Angle to View the Battle with Oxygen in Molybdenum (Mo) Laser Powder Bed Fusion (LPBF) |
| Author(s) |
Shiqi Ma, Shuaihang Pan, Xuehui Shen, Bo Zhao |
| On-Site Speaker (Planned) |
Shuaihang Pan |
| Abstract Scope |
Laser powder bed fusion (LPBF) of Mo is challenging, because Mo has a high ductile-to-brittle transition temperature and is sensitive to oxygen (O). Current successful LPBF Mo suggests an over-strict O control (e.g., ppm-level O) and a high-temp. preheating, which are hard for most commercial LPBF tools and scare away many research efforts. Here, we report successful crack-free Mo LPBF by strategical support design and LPBF parameter optimization. With this, we measure the tensile performance and systematically compare with the powder metallurgy-fabricated Mo as a benchmark. After quantitatively comparing the strengthening mechanisms from microstructures and weakening effects from defects like O, it is believed important to compare LPBF Mo mechanical performance with the right reference, and our results indicate that even though O is still important, commercially capable O control is enough for Mo LPBF, and other mechanisms, including delamination signatures, are important to strength-ductility synergy in LPBF Mo. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Other |