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Meeting Materials Science & Technology 2020
Symposium Additive Manufacturing: Alloy Design to Develop New Feedstock Materials
Presentation Title Optimization of Nitrogen-Atomized 17-4 Stainless Steel Feedstock for AM Processing
Author(s) Carelyn E. Campbell, James Zuback, Mark Stoudt
On-Site Speaker (Planned) Carelyn E. Campbell
Abstract Scope Wrought martensitic precipitation hardened stainless steel, 17-4 PH, is widely used in the aerospace and marine industries when high strength and corrosion resistance are needed. Additively manufactured (AM) nitrogen-atomized 17-4 parts often have unexpected properties that result in poor performance, primarily as the nitrogen acts as an austenite stabilizer and the desired martensitic matrix microstructure is not achieved. This work focuses on optimizing the feedstock composition within the composition specification to control the influence of the nitrogen on the AM part. The current alloy specification allows for significant composition variation in the Cr, Ni, Cu, and Nb contents. The Cr and Ni contents are optimized with respect to the solubility of nitrogen at the processing temperatures and influence on the martensitic start temperature. The Cu and Nb contents are optimized to maximize the precipitation strengthening during aging. The models are validated using experimental results from AM nitrogen-atomized powder 17-4 parts.


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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