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Meeting Materials Science & Technology 2020
Symposium Phase Transformations in Additively Manufactured Materials
Presentation Title Rapid Solidification of Aluminium 6061 Using Fast Scanning DSC
Author(s) Lakshmi Ravi Narayan, Cain Hung, Rainer Hebert
On-Site Speaker (Planned) Lakshmi Ravi Narayan
Abstract Scope In order to model and predict solidification cracking during additive manufacturing, the fraction of solid must be known during rapid solidification as well as the microstructure formation. Fast-scanning Differential Scanning Calorimetry (DSC) was used in this study to determine the fraction of solid of aluminum alloy AA6061 during rapid solidification as a function of temperature and at cooling rates up to 40,000 Ks-1. The experimentally determined solid fractions were compared with analytical predictions. Microstructural analysis was performed on samples of these alloys after solidification at different cooling rates. The liquidus and solidus temperatures decrease by nearly 20 K and 300 K, respectively at the highest cooling rates over near-equilibrium freezing while the microstructure reveals a significant grain refinement. The changes in solidification and in microstructural behavior during rapid cooling are interpreted based on existing theories for their impact on solidification cracking.


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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