About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques
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Presentation Title |
A-28: In-situ Characterization and Quantification of Melt Pool Variation Under Constant Input Energy Density in Laser Powder-bed Fusion Additive Manufacturing Process |
Author(s) |
Qilin Guo, Cang Zhao, Minglei Qu, Lianghua Xiong, Luis I. Escano, S. Mohammad H. Hojjatzadeh, Niranjan D. Parab, Kamel Fezzaa, Wes Everhart, Tao Sun, Lianyi Chen |
On-Site Speaker (Planned) |
Qilin Guo |
Abstract Scope |
Size and shape of a melt pool play a critical role in determining the microstructure in additively manufactured metals. However, it is very challenging to directly characterize the size and shape of the melt pool beneath the surface of the melt pool during the additive manufacturing process. Here, we report the direct observation and quantification of melt pool variation during the laser powder-bed fusion additive manufacturing process by synchrotron x-ray imaging. We show that the melt pool can undergo different melting regimes and both the melt pool dimension and melt pool volume can have orders-of-magnitude change under a constant input energy density. We found that energy absorption changes significantly under a constant input energy density, which is an important cause of melt pool variation. Our further analysis reveals that the significant change in energy absorption originates from the separate roles of laser power and scan speed in depression zone development. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |