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Conference Tools for 2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
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Meeting 2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
Symposium Process Development
Presentation Title Laser-material Interactions in LPBF, Visualised through Optical and X-ray High-speed Imaging
Author(s) Ioannis Bitharas, Niranjan Parab, Cang Zhao, Tao Sun, Anthony Rolett, Andrew J Moore
On-Site Speaker (Planned) Ioannis Bitharas
Abstract Scope We present results from our latest visualisation studies of atmospheric effects during LPBF. The interactions between the laser, metallic vapour, particles, and gas cross-flow during multilayer builds are analysed both experimentally and through multiphysics modelling. We examine the production of process by-products, characterise their extraction and highlight the most important factors. Simultaneous synchrotron x-ray and schlieren imaging experiments give insight into the joint behaviour of the melt pool, laser plume, and powder particles. The interconnected dynamics of the vapour and liquid phases are explored under varying energy input. Image processing and analysis aid in relating our observations to process stability.
Proceedings Inclusion? Definite: Post-meeting proceedings

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Data Integration Framework for Additive Manufacturing Big Data Management
A Modular Lightweight Additive Manufacturing System for Cementitious Materials with Diverse Aggregate Sizes
A Novel Non-destructive Testing Method for Powder Bed Fusion Processes in Laser-based Additive Manufacturing
A Numerical Study Showing the Impacts of Dwell Time during the Laser Powder Bed Fusion Process
A TRIZ-Based Analysis of the Fundamental Limits of Fused Filament Fabrication
Binder/Powder Interaction in Binder Jetting: From Lines to Layers
Closed-loop Control of Meltpool Temperature in Directed Energy Deposition
Combining Technologies: In-situ Direct-write Techniques for Hybrid Injection Molded Electronics
Concrete Metering and Extrusion System for Infastructure-scale Printing
Design and Implementation of Laser Powder Bed Fusion Additive Manufacturing Testbed Control Software
Development of a Variable Tensioning System to Reduce Separation Force in Large-scale Stereolithography
Effect of Powder Velocity on Porosity Formation in Directed Energy Deposition
Effect of Scan Strategy on Melt-pool Geometry, Surface Topology and Internal Porosity of Additively Manufactured Inconel 625 Alloy
Fabrication of Bioinspired Optical Material with Self-sensing Capability via Thermal Field Assisted 3D Printing
Feasibility Study of Large-format, Freeform 3D Printing for On-orbit Additive Manufacturing
Geometrical Analysis of Simple Contours Deposited by a 3D Printing Hexacopter
High-speed synchrotron X-ray imaging of directed energy deposition of metals: the comparison of powder delivering performance, effects of processing parameters on the pore formation, and pore formation mechanisms
Image Registration and Matching Error in 2D and 3D for Laser Powder Bed Fusion
Improving the 3D Printed Bond Strength at a Discrete Interface Between Dissimilar Materials
In-situ Detection of Laser Powder Bed Fusion Process Signatures Based on Sensor Fusion Approach
In-situ Meltpool Monitoring and Temperature Estimation via Two-wavelength Pyrometry Using a Single Camera
Insertion and Air-gapped Retrieval of Part Quality Information in Additive Manufacturing Toolpaths for Cyber-Secure In-situ Process Monitoring
Investigations on Optical Emissions and Their Relation to Processing Parameters and Processing Regimes in the Laser Powder Bed Fusion Process
Laser-material Interactions in LPBF, Visualised through Optical and X-ray High-speed Imaging
Laser Powder Bed Fusion of Stainless Steel 316L Using a Flexible Dual Fiber Laser Array
Material Pressure Sensing at the Nozzle in Direct-write Additive Manufacturing Enables the Precise Fabrication of Complex Parts
Mechanical Characterization of Epoxy Components Manufactured via Reactive Extrusion
Mechanical Evaluation of Topology and Toolpath Optimized Composite Structures Manufactured via Multi-axis Material Extrusion
Multi-track Geometry Prediction in Powder Fed Laser Additive Manufacturing Using Machine Learning
Multiple-material powder bed fusion machine development: reducing cross-contamination between materials
Optical Emission Sensing for Laser-based Additive Manufacturing – What Are We Actually Measuring?
Optical Observation of Sintering State for Large Area Projection Sintering (LAPS)
Pore Coalescence in Directed Energy Deposition Using in-situ X-ray imaging and Infrared Thermography
Powder Capture Efficiency Monitoring with In-situ, 3D, Surround Digital Image Correlation in Directed Energy Deposition Additive Manufacturing
Powder Spread Process Monitoring in Polymer Laser Sintering and Its Influences on Part Properties
Pseudo Melt Pool Thermal Feature Construction for In-situ Thermography of Laser Powder Bed Fusion
Review of Current Problems and Developments in Large Area Additive Manufacturing (LAAM)
Robot Trajectory Planning for Large Scale Additive Manufacturing
Static Liquid Interface to Reduce Support Structure Necessity in Top-Down Stereolithography
Stress Shielding Effect during Compaction of a Selectively Variant Powder Bed in Hydrothermal-assisted Jet Fusion of Ceramics
Understanding the Effects of Driving Signal for Piezoelectric Inkjet Printing
Use of Wire Grid Polarizers with Liquid Crystal Display for Large Volume Stereolithography
Variable Extrusion Width for Interlocking Features in Fused Filament Fabrication 3D Printing
Vibration-actuated Powder Dispensing for Directed Energy Deposition Systems

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