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Meeting Materials Science & Technology 2020
Symposium Additive Manufacturing: Alloy Design to Develop New Feedstock Materials
Presentation Title Microstructure and Property Variability in DED Inconel 718 as a Function of Build Rate
Author(s) Bernard Gaskey, Ekta Jain, Yong Chen Yeoh, Guido Macchi, Antonio Mattia Grande, Matteo Seita
On-Site Speaker (Planned) Matteo Seita
Abstract Scope Directed energy deposition (DED) is a candidate additive manufacturing technique for high volume production of metallic parts. The complex nature of thermal and material transport during DED, however, can yield significant microstructure heterogeneity and large property scatter which are difficult to eliminate using standard heat treatments. In this work, we investigate how the build rate impacts solute distribution and, consequently, the mechanical properties of Inconel 718. At high deposition rates, we measure differences in yield strength and hardness within the same build up to 15% and 10%, respectively. We interpret these differences in terms of the material cooling rate, which decreases along the build direction. Based on our results, we discuss possible strategies for microstructure and property homogenization of DED Inconel 718 without compromising on build rate.
Proceedings Inclusion? Undecided


3D Characterization of Cracks Formed in “Weldable” AA6061 and Implications for Alloy Design
Accidental Alloy Development: In-situ Evolution of AM Powder and Opportunities for New Material Synthesis Pathways
An Interdisciplinary Approach for Alloy Design for Additive Manufacturing
Application of Taguchi, Response Surface, and Artificial Neural Networks for Rapid Optimization of Direct Metal Laser Sintering Process
CALPHAD Informed Design of Rare-earth Containing Alloys for Additive Manufacturing
Characterization of Spatter with Organized Features in Laser Powder Bed Fusion
Development of Oxidation Resistant Multi-Principle Element Alloys Applied with Additive Manufacturing
High-Throughput Accelerated Alloy Development
Laser Additive Manufacturing of Nanocomposite Powders
Mechanical Alloying of Feedstock Powder for Additive Manufacturing by Selective Laser Melting: Aluminum Alloy Matrix Composites
Micro-crack Mitigation by Alloy Modification in the Additively Manufactured Ni-base Superalloy CM247LC
Microstructure and Property Variability in DED Inconel 718 as a Function of Build Rate
Opportunities to Improve the Mechanical Properties of Titanium Alloys Produced by Laser Powder Bed Fusion
Optimization of Nitrogen-Atomized 17-4 Stainless Steel Feedstock for AM Processing
Processing of Y2O3-modified Nickel Superalloy by Selective Laser Melting.
Residual Stress Mitigation of Additive Manufactured Stainless Steel 316L Components through the Directed Energy Deposition Inclusion of TiC Nanoparticles
Sensitivity Analysis and Composition Design for Metal Additive Manufacturing Using CALPHAD-based ICME Framework

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