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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Application of Solidification Fundamentals to Challenges in Metal Additive Manufacturing
Presentation Title Characterization of Rapid Cooling during Laser Powder Bed Fusion Additive Manufacturing of Ti-6Al-4V Using In Situ High Speed Synchrotron X-ray Diffraction
Author(s) Nicholas Calta, Aiden Martin, Jenny Wang, Philip Depond, Gabriel Guss, Vivek Thampy, Andrew Kiss, Anthony Fong, Johanna Nelson Weker, Kevin Stone, Christopher Tassone, Ryan Ott, Matthew Kramer, Michael Toney, Tony Van Buuren, Manyalibo Matthews
On-Site Speaker (Planned) Nicholas Calta
Abstract Scope In parts produced by laser powder bed fusion (LPBF) additive manufacturing, the as-built part experiences rapid heating and cooling due to local thermal cycling caused by multiple laser passes over a given region of material. Controlling the microstructure that results from this unusual thermal history is critical to the overall quality of LPBF parts. To quantify the kinetics of phase transformations induced by these thermal effects, we have performed in situ synchrotron x-ray diffraction to probe the region in and around the melt pool during LPBF of Ti-6Al-4V. Our measurements directly observe the β to α phase transition upon rapid cooling immediately after laser melting. We discuss the effect of laser power on phase transition and cooling kinetics and strategies to alter those kinetics by manipulating laser processing parameters. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344
Proceedings Inclusion? Planned: Supplemental Proceedings volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Application of Interface Response Function Theory to Describe Non-equilibrium Solidification during Welding and Additive Manufacturing
Building Microstructure-cooling Rate Relationships in Laser Welded Uranium-6 Wt. Pct. Niobium for Laser Powder Bed Fusion Processing
Cellular Automata Modeling of Nucleation and Grain Growth in Alloy-based Additive Manufacturing
Characterization of Rapid Cooling during Laser Powder Bed Fusion Additive Manufacturing of Ti-6Al-4V Using In Situ High Speed Synchrotron X-ray Diffraction
Crystal Growth in Face-centred-cubic Alloys Made by Additive Manufacturing: Epitaxial Growth, Branching and Splitting
Development of an In-situ TEM with Laser Sintering Capabilities at Sandia National Laboratories
Dynamics of Melting and Resolidification: Application to the Inter-layer Band Microstructure in Laser Metal Deposition
Enabling New Additive Alloys through Solidification Control
Experimental and Simulation Study of Solidification and Micro-structural Evolution of Liquid Metal Alloys for Additive Manufacturing Process Simulation and Materials Design
Fast Synchrotron X-ray Imaging of the Mechanisms Controlling Laser Additive Manufacturing
Fluid Dynamics Effects on Microstructure Prediction in the Laser Additive Manufacturing Process
Heat Transfer and Fluid Flow during Fabrication of Overhang Structure in Laser-powder Bed Fusion Additive Manufacturing
In-situ Monitoring of Solidification during Powder-deposition Based Additive Manufacturing
Laser Powder Bed Fusion of Metal and Bioactive Glass Revealed Via Synchrotron X-ray Imaging
Microstructural Modeling of the Solidification of Alloys in Additive Manufacture
Microstructure and Wear Resistance of Laser Deposited Cobalt-free Cu-based Alloy for Valve Seat Application
Microstructure Control in Laser Powder Bed Fusion: Correlating Directional Solidification Parameters with Selected Process Variables and Material’s Properties
Microstructure Formation in Rapid Solidification of Electron-beam Melted Ni-Sn Alloys
Phase-field Modeling of Solidification Microstructures during Additive Manufacturing
Phase-field Modeling of Solidification under SLM Conditions
Simulating Grain Formation during Metal Additive Manufacturing (AM): Potential Pathways for Producing Equiaxed Grain Structures
Solid Solubility Extension and Microstructural Evolution during Single and Double Pass Laser Scans in Al-Co and Al-Ce Binary Alloys
Solidification Cracking during Selective Laser Melting (SLM) of Nickel-base Superalloy Inconel-738LC
The Effect of Grain Refiners on the Columnar to Equiaxed Transition in Metal Additive Manufacturing of Aluminium Alloys
Tomography and 3D Grain Mapping for Additive Manufacturing Qualification

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