About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Advanced Materials for Harsh Environments
|
| Presentation Title |
Mechanisms of Oxide Loss During Laser Powder Bed Fusion of Oxide Dispersion-Strengthened Alloys |
| Author(s) |
Nathan A. Wassermann, Benjamin Mejia Diaz, Lin Shao, Alan J.H. McGaughey, Sneha Prabha Narra |
| On-Site Speaker (Planned) |
Nathan A. Wassermann |
| Abstract Scope |
Oxide nanoparticles are commonly added to feedstock to manufacture oxide dispersion-strengthened (ODS) alloys by laser powder bed fusion (L-PBF). However, over 80% of the added oxides can be lost during processing, potentially limiting the mechanical performance of fabricated parts. Though oxide losses have been widely reported in prior studies, the mechanisms of loss remain poorly understood. In this work, we investigate three loss pathways: vaporization, surface accumulation, and spatter ejection. A numerical model based on the Hertz–Knudsen–Schrage equation indicates that vaporization losses are minimal under typical processing conditions. In contrast, chemical analysis and electron microscopy show that a significant fraction of oxides accumulate at part surfaces. Analysis of spatter size and composition reveals that ejected particles remove a substantial amount of oxide-rich material. These results provide insight into oxide loss mechanisms, informing future efforts to predict and control oxide content. |