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Meeting Materials Science & Technology 2020
Symposium Phase Transformations in Additively Manufactured Materials
Presentation Title In-situ Characterization of Rapid Phase Evolution of AM Metals with High Energy Synchrotron X-ray Diffraction
Author(s) Seunghee Oh, Rachel Lim, Joseph Aroh, Joseph Pauza, Runbo Jiang, Venkata Satya Surya Amaranth Karra, Sidi Feng, Andrew Chihpin Chuang, Joel Bernier, Benjamin J Gould, Robert M. Suter, Anthony D. Rollett
On-Site Speaker (Planned) Seunghee Oh
Abstract Scope Laser-based processing in additive manufacturing (AM) is accompanied by rapid heating and cooling, resulting in abrupt changes in phase and microstructure. Using an in-situ high-speed high-energy synchrotron X-ray dynamic diffraction technique built with a 520W fiber laser system coupled with a scan head at 1-ID-E at the Advanced Photon Source provides key insights about AM processing. The fast acquisition rate, 250Hz, allows us to observe transient phenomena in phase formation, which were not previously accessible. A Pilatus area detector, which can capture whole diffraction rings, provides intuitive and quantitative information for quantifying the evolution of the phases during the AM process. Data processing was utilized to quantify several aspects, including phase fractions and microstrain. Thermal history was inferred from thermal expansion. Material in the fusion zone develops tensile residual strain, as expected. Unexpected precipitation behavior is observed, however. Time-resolved descriptions were used to represent the various trends.


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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