About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Materials Design and Alloy Development IV: Rapid Development
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Presentation Title |
Relationship between the Solidification Behavior and Porosity in Gas-atomized Powders and Electron Beam Melted Co-Cr-Mo Alloys |
Author(s) |
Kenta Yamanaka, Shoya Aota, Jérôme Adrien, Eric Maire, Damien Fabrègue, Akihiko Chiba |
On-Site Speaker (Planned) |
Kenta Yamanaka |
Abstract Scope |
Eliminating the powder-originated porosity in additive manufacturing is challenging in designing and fabricating highly durable components. In this study, we examined the formation of pores during gas atomization and subsequent electron beam melting (EBM) processes of the Co-27Cr-6Mo alloys with a wide range of carbon contents (0.04-2.5 mass%). X-ray CT successfully captured spherical gas pores in both raw powder and as-built specimens. The porosity and pore size in powders increased with increasing the carbon content. In contrast, part of pores was eliminated during the EBM process and the low-carbon alloys showed negligible porosity. Notably, a dramatic decrease in the porosity during the EBM process was observed in the as-built specimen with 2.5 mass% carbon. Such a variation could be correlated with the change in the solidification microstructure and demonstrated that a smooth solid-liquid interfaces in the cellular or eutectic solidification effectively eliminates gas bubbles in the melt pool. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Solidification, Powder Materials |