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Meeting Materials Science & Technology 2020
Symposium Phase Transformations in Additively Manufactured Materials
Presentation Title Phase Field Simulations of Cellular-to-Dendritic Transition under Additive Manufacturing Conditions
Author(s) Younggil Song, Steve DeWitt, Bala Radhakrishnan, John A. Turner
On-Site Speaker (Planned) Younggil Song
Abstract Scope Columnar dendritic microstructures are often observed during solidification of structural alloys under additive manufacturing conditions. We present large scale, high-resolution, three-dimensional, phase field simulations of the evolution of an initially flat solid-liquid interface into a cellular structure, growth competition between cells, and the initiation of the cellular to dendritic transformation (CDT) in a ternary Ni-Fe-Nb alloy that serves as a surrogate for the nickel-base superalloy 718. The simulations capture the effect of the temperature gradient and the solid-liquid interface velocity on the critical cell spacing above which CDT occurs. The mechanism by which the dendritic sidebranches emerge and grow will be examined through characterization of the evolution of the cell morphology and the solute concentration fields at the vicinity of the cell tip. Research performed at ORNL under contract DE-AC05-00OR22725 and supported by the Department of Energy’s Exascale Computing Project and the Oak Ridge Leadership Class Computing Facilities.


Design of Post-fabrication Heat Treatments for Ti Free Grade 300 Maraging Steel Manufactured Using Laser Powder Bed Fusion (LBPF) Process
Development of Non-equilibrium Thermodynamic Tools for Additive Manufacturing
Effects of Laser Powder Bed Fusion Parameters and Heat Treatment on Microstructure and Mechanical Behavior of Inconel 718 Alloy
In-situ Characterization of Rapid Phase Evolution of AM Metals with High Energy Synchrotron X-ray Diffraction
Laser Powder Bed Fusion of Grade 300 Maraging Steel for Tooling Applications
Laser Powder Bed Fusion of Stainless Steel 15-5PH: Microstructure Analysis and Process Optimization
Microstructure Engineering through Post-heat Treatment of Inconel 718 Superalloy Made by Laser Powder Bed Fusion
Phase Field Simulations of Cellular-to-Dendritic Transition under Additive Manufacturing Conditions
Process Optimization and Microstructure Analysis to Understand Laser Powder Bed Fusion of Stainless Steel 316L
Rapid Solidification of Aluminium 6061 Using Fast Scanning DSC
Real-time Observation of the Competition between Ferritic vs Austenitic Solidification in Micro-laser Welding of 316L Using Synchrotron X-ray Diffraction
Understanding the Effect of Thermal Gradients on Additively Manufactured (AM) Builds Using In Situ TEM

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