About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
|
Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
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Presentation Title |
Formation and Elimination of Micron-Scale Oxide Inclusions in Ni-20Cr + Y2O3 ODS Alloy Fabricated with Laser Powder Bed Fusion |
Author(s) |
Nathan A. Wassermann, Alan McGaughey, Sneha Narra |
On-Site Speaker (Planned) |
Nathan A. Wassermann |
Abstract Scope |
Oxide dispersion-strengthened (ODS) alloys contain a high number density of nanometric dispersoids, providing exceptional creep strength in high-temperature service environments. While laser powder bed fusion (L-PBF) offers advantages over the conventional manufacturing route, a high population (>0.5 vol%) of deleterious micron-scale oxide inclusions was observed in previous studies, limiting the mechanical performance. In this study, a Ni-20Cr feedstock coated with 1 wt% Y2O3 nanoparticles is used to fabricate single track beads, single layer pads, and bulk samples with L-PBF to gain insight into oxide transport across a variety of length scales. Comparison of the single layer samples and the bulk samples reveals that micron-scale oxide agglomerates either solidify into the bulk microstructure or are transported to the surface, depending on the processing conditions. The results contribute to the mitigation of agglomeration-driven defects in metal-matrix composites fabricated with fusion-based additive manufacturing. |