ProgramMaster Logo
Conference Tools for 2020 TMS Annual Meeting & Exhibition
Register as a New User
Submit An Abstract
Propose A Symposium
Presenter/Author Tools
Organizer/Editor Tools
About this Abstract
Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Defects and Properties of Cast Metals
Presentation Title Resolving Pore Evolution Mechanisms During Laser Powder Bed Fusion Additive Manufacturing by Multi-modal Imaging
Author(s) Chu Lun Alex Leung, Sebastian Marussi, Lorna Sinclair, Samuel Clark, Yunhui Chen, Leigh Stanger, Jon Willmott, Robert C Atwood, Andrew J Bodey, Margie P Olbinado, Alexander Rack, Peter D Lee
On-Site Speaker (Planned) Chu Lun Alex Leung
Abstract Scope Pore evolution mechanisms in laser powder bed fusion (LPBF) additive manufacturing depend on many factors, ranging from materials chemistry to processing parameters, and hence are not well-understood. Here, we capture the pore dynamics inside single-layer melt tracks during PBF of virgin and oxidised powders using high-speed synchrotron X-ray, optical, and infra-red imaging. This is done for both overhang and multi-layer build conditions. Our results show that pores can form during melting and during solidification. Gas pores can (1) migrate in the molten pool via Marangoni convection, (2) grow in the expense of the others via coalescence, (3) dissolve into the solid solution or (4) eject as spatter during laser re-melting, (5) and precipitate into the melt pool or (6) lead to bubble bursting during cooling. Our results confirm that their size, morphology, and location are strongly depending on the processing parameters, shedding light onto pore formation mechanisms in LPBF.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


Advances on Inspection and Numerical Modelling of Surface Defects During Continuous Casting of Steel
An Experimental Characterization of Thermophysical Properties of a Porous Ceramic Shell Used in the Investment Casting Process
Analysis of Solidification and Thermal-mechanical Behaviors in Continuous Casting
Assessment of Grain Refinement on Hot-tearing of New Multicomponent Al-Cu Alloys
Bubble Induced Convection During Dendritic Solidification
Controlling Freckle Defect Formation Using Magnetic Fields
Coupling Hot-tearing of High γ’ Nickel Alloys to Processing Parameters Through Classic Solidification Criteria
Crystal Mosaicity in Single Crystal Ni-based Superalloys
Defects Comparison between Single and Double-sided Electron Beam Welded Dissimilar DP600 Steel to 5754 Al Alloy Joints: X-ray Tomography Study
Deformation Induced Crack Growth in Semi-solid Die Cast Aluminum Alloys
How to Prevent Gas Porosity Defects in Castings of Stator Housing in Grey Cast Iron
In-situ Synchrotron Examination of the Evolution and Transition of Nodular, Compacted and Laminar Graphite During Solidification of Cast Iron
In-situ Tomographic Investigation of Co-base Alloy Solidification Features
Influence of Casting Conditions on Crack Sensitivity of Micro-alloyed Steel Slabs During Continuous Casting
Influence of Composition on the Solidification and Weldability of Cast Austenitic Stainless Steels
Influence of Various Cast Defects in Fe-Al-Cr-Zr Intermetallics on the High Temperature Oxidation Behavior
M-52: Microstructure Evolution and Chemical Composition in Continuous Directional Solidification Cu–P–Sn Alloy
M-53: Ni/Mn Replacement in High-Ni Austenitic Stainless Cast Steels Used for Turbo-charger
M-54: Synchrotron Validated Modelling of Pore Formation During High Pressure Die Casting
M-55: The Optical and Electronic Features of HgSiX2 (X=P, As) Chalcopyrite Materials: A First Principle Calculations
Modification of Al-Si Alloys with Rare Earth Elements
Multiphase Flow-related Defects in Continuous Casting of Steel Slabs
Resolving Pore Evolution Mechanisms During Laser Powder Bed Fusion Additive Manufacturing by Multi-modal Imaging
Spatially Resolved Compositional and Isotopic Analysis of As-cast Metallic Nuclear Fuels
Tensile Properties Limits of A356 Alloy by Porosity
The 3D Correlation of Si Segregation to Nodules Size, Nodules Spatial Distribution and Local Mechanical Strain in Ductile Cast Iron
The Influence of Ultrasound on the Microstructure Formation During the Solidification of A356 Ingots Processed via a 2-Zone Induction Melting Furnace
The Prediction of Solidification Defects: A Multi-defects Modeling
Ti Fading Effect in Primer and Seconder A356 Alloys and Melt Quality

Questions about ProgramMaster? Contact