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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Application of Solidification Fundamentals to Challenges in Metal Additive Manufacturing
Presentation Title Microstructure Control in Laser Powder Bed Fusion: Correlating Directional Solidification Parameters with Selected Process Variables and Material’s Properties
Author(s) Umberto Scipioni Bertoli, Julie M Schoenung
On-Site Speaker (Planned) Umberto Scipioni Bertoli
Abstract Scope Laser powder bed fusion additive manufacturing (L-PBFAM) offers great opportunities for local microstructure control. In this process, solidification occurs in conditions far from equilibrium and possesses – in the majority of cases – a strong directionality. In general, the size and morphology (e.g: cellular, dendritic, equiaxed) of the resulting microstructure is a function of two well-known parameters: the temperature gradient within the liquid phase (G) and the velocity of the solidification front (R). We develop a simple model to express these two parameters as a function of selected process variables (e.g: laser scan speed, laser power, substrate temperature) and material’s properties (e.g: conductivity, absorptivity) allowing the prediction of both the size and morphology of the resulting microstructure. We corroborate the model through the characterization of the microstructure in metallic parts printed on an SLM 125HL machine using 316L and IN 625 powders.
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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