About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Materials Design and Alloy Development V – Design Fundamentals
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Presentation Title |
Oxide Coarsening Effects during Melt-based Additive Manufacturing: Experiment and Characterization |
Author(s) |
Timothy Stubbs, Roger Hou, Zachary C Cordero, Yuman Zhu, Aijun Huang |
On-Site Speaker (Planned) |
Timothy Stubbs |
Abstract Scope |
Oxide dispersion-strengthened (ODS) superalloys utilize a uniform nano-scale oxide dispersion to stabilize and strengthen their microstructure in extremely demanding environments. Due to the limited manufacturing flexibility and high cost of producing these materials conventionally, there has recently been attention given to Additive Manufacturing (AM) techniques for producing near-net-shape products with minimal dispersoid coarsening and slagging. This study investigates the production of MA754 (Ni-20Cr-1Fe-0.3Al-0.5Ti-0.05C-0.6Y2O3 wt.%) via Directed Energy Deposition (DED) and Laser Powder Bed Fusion (L-PBF) from mechanically alloyed feedstock. The as-printed material is relatively defect free but contains significantly coarsened dispersoids and large oxide slag inclusions which weaken the material. The dispersoids and slag were shown through correlative EDS-EBSP analysis to contain Y-Al-O compounds, indicating that initially-pure Y2O3 reacts with the alloying aluminum during the brief melt cycle. Mitigating the effect of this reaction on dispersoid coarsening and agglomeration will therefore be the key to successful AM of ODS superalloys. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Copper / Nickel / Cobalt, High-Temperature Materials |