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Meeting MS&T21: Materials Science & Technology
Symposium Additive Manufacturing: Advanced Characterization for Industrial Applications
Presentation Title In-situ Characterization of Pore Formation Dynamics in Pulsed Wave Laser Powder Bed Fusion
Author(s) Seyed Mohammad Hassan Hojjatzadeh, Qilin Guo, Niranjan D. Parab, Minglei Qu, Luis I. Escano, Kamel Fezzaa, Wes Everhart, Lianyi Chen
On-Site Speaker (Planned) Seyed Mohammad Hassan Hojjatzadeh
Abstract Scope Laser powder bed fusion (LPBF) is an additive manufacturing technology with the capability of printing complex metal parts directly from digital models. Between two available emission modes employed in LPBF printing systems, pulsed wave (PW) emission provides more control over the heat input compared to continuous wave (CW) emission. However, parts printed with pulsed wave LPBF (PW-LPBF) commonly contain pores, which degrades their mechanical properties. Here, we reveal pore formation mechanisms during PW-LPBF in real time by using in situ high-speed synchrotron x-ray imaging technique. We found the vapor depression collapse proceeds when the laser irradiation stops within one pulse, resulting in occasional pore formation during PW-LPBF. We also revealed that the rapid melt pool solidification during pulsed-wave laser melting resulted in cavity formation and subsequent formation of pore pattern in the melted track. The pore formation dynamics revealed in this study can provide guidance on developing pore elimination approaches.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

In-situ Quality Monitoring of PBF AM Parts
Characterizing Powder Spreading Dynamics in Powder Bed Fusion AM Process by High-speed X-ray Imaging
Domain Adaption for Enhanced X-ray CT Reconstruction of Metal Additively Manufactured Parts
Gradient Alloy Heat Exchanger Manufacturing for Energy Applications
In-situ Characterization of Pore Formation Dynamics in Pulsed Wave Laser Powder Bed Fusion
Investigation of the Protective Mixture Influence on the Heat Input Meaning for the Layered Electric Arc Surfacing of Aluminum Alloys AlSi5 and AlMg5
Moisture Impacts in AM Metal Powders Characterized by Karl Fischer Oven Titration and Avalanche Rheometry
Operando Synchrotron X-ray Studies of Metal Additive Manufacturing: From Fundamentals to Industrial Applications
Predicting Failure Location in Additively Manufactured Metals Using an Improved Void Descriptor Function
Synchrotron Characterization of Hot Cracking and Related Topics
Tensile Behavior of Metal AM Lattice Structures
The Effect of the Cross-sectional Area on the Microstructure and Mechanical Properties of AlSi10Mg Parts Manufactured by Laser Powder Bed Fusion (L-PBF)
The Influence of the Characteristic Microstructure of Additively Manufactured AlSi10Mg on the Mechanical Behaviour at Various Strain Rates
Thermo-mechanical Behavior of AM and Wrought IN718 Under High-strain-rate Tensile Deformation
Understanding the Keyhole Dynamics in Laser Welding Using Time-resolved X-ray Imaging Coupled with Computer Vision and Data Analytics

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