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 |
Study of Gas Entrapment and Its Effects on Porosity in 17-4 PH Atomized Powder Laser Powder Bed Fusion (LPBF) Parts |
Author(s) |
Ziheng Wu, Debomita Basu, Robin Kuo, Jack Beuth, Anthony Rollett |
On-Site Speaker (Planned) |
Ziheng Wu |
Abstract Scope |
Gas entrapment in powder particles is nearly inevitable during the gas atomization process and is problematic because it can affect the mechanical properties of AM-built parts. In this work, several Ar and N2 atomized 17-4 PH stainless steel powders with different levels of gas entrapment are used in the laser powder bed fusion (LPBF) process with Ar and N2 building environments. Process maps for different 17-4 PH powders are also developed through process optimization. Through advanced synchrotron-based high energy X-ray techniques such as computed tomography (CT), and dynamic x-ray radiography (DXR), we can determine the formation mechanisms, the morphology, the size distribution and the spatial distribution of porosity. The results show that the level of entrapped gas and the final in-part porosity correlate with the atomization and build atmospheres. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |