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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques II
Presentation Title In-situ Characterization of Melt Flow Instability in Laser Metal Additive Manufacturing
Author(s) Qilin Guo, Minglei Qu, S. Mohammad H. Hojjatzadeh, Luis I. Escano, Zachary Young, Kamel Fezzaa, Lianyi Chen
On-Site Speaker (Planned) Qilin Guo
Abstract Scope Melt flow plays a critical role in laser melt additive manufacturing, controlling the melt pool development, defect formation/evolution, solidification, and spatter generation. However, during common process designing or modeling, the melt flow is always assumed to maintain a “regular” pattern within a melt pool, without considering the unstable flow behavior. Here, we report the melt flow instability in laser metal additive manufacturing process. By in-situ high-speed high-energy synchrotron X-ray imaging, for the first time, we will reveal the mechanisms for causing the instabilities of melt flow, as well as the consequences brought by the unstable flow in additive manufacturing process. The results provide crucial insights into laser additive manufacturing processes.
Proceedings Inclusion? Planned:
Keywords Additive Manufacturing, Characterization, Other


Blown Powder Additive Manufacturing Process Replicator for High Speed Optical, Infra-red and Synchrotron X-ray Imaging
Building Links between Laser Melting Phenomena Observed with In Situ X-ray Imaging and Laboratory-based Process Monitor
Cellular Structures Strengthening Mechanisms and Thermal Stability of L-PBF Stainless Steel 316L
Characterization of the Healability of Aluminium Alloys Produced by Laser Powder Bed Fusion (L-PBF) Using X-ray Nanoholotomography at Synchrotron (ESRF)
Characterizing Void Morphology in Single-track Builds of Directed Energy Deposition Using New Image Processing Techniques for X-ray Computed Tomography Data Sets
Controlling Interdependent Meso-nanosecond Dynamics and Defect Generation Using a Digital Twin
Deep Learning for Real-time Non-destructive Inter-layer Quality Control during Additive Manufacturing Process
Effect of Heat Treatments on Fabricated Wire and Arc Additive Manufacturing Parts of Stainless Steel 316: Microstructure and Synchrotron X-ray Diffraction Analysis
Flexible Simulation Augmentation for DED AM Using In-situ Digital Image Correlation, Multispectral Infrared Imaging, and Neutron Scattering Validation
Grain Morphology Prediction in AM Simulated Beta-Titanium
High-throughput Surface Characterization to Identify Processing Defect Boundaries in Additively Manufactured Materials
In-situ Characterization of Laser Powder Bed Fusion Processes at the Stanford Synchrotron Light Source
In-situ Characterization of Melt Flow Instability in Laser Metal Additive Manufacturing
In-situ Characterization of Residual Strain Relaxation of Additively Manufactured Inconel 625 through Energy-resolved Neutron Imaging
In-situ Heat Treatment of Additively Manufactured Ti-6Al-4V
In-situ Process Monitoring for Laser Powder Bed Fusion: A Data-driven Approach
In-situ Residual Strain Monitoring in Metal Additive Manufacturing
In-situ Synchrotron X-ray Diffraction Experiments to Study the Role of Solid-state Thermal Cycling on Microstructure Formation during Metal AM
In-situ TEM Heating-cooling Experiments to Study Precipitate Evolution in DED 316L Steel
In-situ Temperature Quantification during Laser Powder Bed Fusion Additive Manufacturing
In Situ Characterization of Laser-based Metal Additive Manufacturing by Detection of Thermal Electron Emission
In Situ Synchrotron Analysis of Aging in Commercial High Strength 7000 Series Additive Aluminum Alloys
In Situ Synchrotron Characterization of the Fatigue Behavior of WE43 Mg Porous Scaffolds for Biomedical Applications
In Situ X-ray Diffraction and Visualization of Laser Melting and Subsequent Phase Evolution
Investigating the Ferrite-to-Austenite Solidification Competition in Stainless Steel Laser Welds with Time-resolved X-ray Diffraction
Investigating the Impact and Evolution Porosity of LPBF Ti6Al4V Using In-situ Mechanical/XCT Testing
Keyhole Melting Regimes and Porosity Formation during Laser Powder Bed Fusion Additive Manufacturing
Material Processing-microstructure-mechanical Property Relationship of Supersolidus Liquid Phase Sintered Binder Jet Additively Manufactured H13 Tool Steel
Melt Pool Oscillations at Keyhole Transition as a Precursor to Pore-generating Turbulence
Multimodal Characterization of L-PBF 316L Stainless Steel
Neutron Imaging Capabilities and Recent Development at High Flux Isotope Reactor
NOW ON-DEMAND ONLY - Digitally Twinned Additive Manufacturing: Real-time Detection of Flaws in Laser Powder Bed Fusion by Combining Thermal Simulations with In-Situ Meltpool Sensor Data.
NOW ON-DEMAND ONLY - In-operando X-ray Scattering Diagnostics to Observe Morphological Transformations during Additive Manufacturing
NOW ON-DEMAND ONLY - Unveiling Phase Transformation Dynamics of Metals under Additive Manufacturing Conditions by In-situ High-speed X-ray Diffraction
NOW ON DEMAND ONLY: Comparison of Benefits and Limitations of High Temporal Versus Low Temporal Resolution of In Situ In Operando AM Imaging of Superalloys
On the Effects of Additive Manufacturing Process Parameters on the Performance of Hastelloy-X: A Neutron Diffraction Experiment and CPFE Modeling
Overview of Modelling for Deformation Temperature and Stress Prediction for Wire Arc Large Scale Additive Manufacturing
Pairing X-ray Synchrotron Imaging, In-situ Absorption Measurements, Thermal Modeling, and Post-mortem Metallography Towards the Understanding of the Solidification Microstructures in Ti-6Al-4V for Additive Manufacturing Applications
Porosity Formation, Evolution, and Solidification in Powder-blown Directed Energy Deposition Additive Manufacturing Using High-speed Synchrotron X-ray Imaging
Precipitate Evolution in DED 316L Stainless Steel Due to Solid State Thermal Cycling: A 3D synchrotron X-ray Nanotomography Study
Predicting WAAM Material Properties via Machine Learning
Sensor Enabled Material Response Prediction in Powder Bed Fusion Additive Manufacturing
Simultaneous 3D-location and Temperature Tracking of Hot Spatter during Laser Powder Bed Fusion Using a High-speed Spectral Plenoptic Camera
Solidification Crack Propagation and Morphology Dependence on Processing Parameters in AA6061 from Ultra-high-speed X-ray Visualization
Study of Solidification Behavior in Laser Additive Manufacturing Using Synchrotron X-ray Diffraction
Time-resolved Structural Characterization of Ni Alloy 718 under Laser Processing with In-situ Synchrotron X-ray Diffraction
Utilising High-speed Synchrotron X-ray Imaging to Understand the Response of AM Alloys under Realistic Processing Conditions

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