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Meeting Materials Science & Technology 2020
Symposium Additive Manufacturing: Alloy Design to Develop New Feedstock Materials
Presentation Title 3D Characterization of Cracks Formed in “Weldable” AA6061 and Implications for Alloy Design
Author(s) Giuseppe Del Guercio, Graham McCartney, Nesma Aboulkhair, Chris Tuck, Marco Simonelli
On-Site Speaker (Planned) Giuseppe Del Guercio
Abstract Scope Solidification cracking is one of the major issues in the development of Laser-Powder Bed Fusion (L-PBF) of high strength Al-alloys. Weldability and cracking indices developed for processes where single heating/cooling profiles are imposed present shortcomings in predicting cracking behaviour during L-PBF - where materials experience multiple thermal cycles. In this talk, we investigate the origins of the cracking phenomena in the “weldable” aluminium alloy AA6061, to expose the merits and limitations of weldability indices in the context of L-PBF. The cracks formed in printed AA6061 and AA6061+Si (to mimic the influence of typical welding fillers) are characterised in 3D using a plasma FIB-FEGSEM to understand the effects of elemental segregation, crystallographic texture and dendrite morphology on the cracking phenomena. Such fundamental understanding is of paramount importance and will be discussed in relation to a newly proposed alloy design strategy for high strength aluminium alloys for L-PBF.


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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