Publications by authors named "Goncalo Pardal"
In developing a wire-arc directed energy deposition process for superalloys used in high-speed flight environments, Inconel 718 was deposited using a plasma arc process and tested for its high temperature performance. The deposited material was tested in both the as deposited condition and after an age-hardening industry standard heat-treatment for this alloy. Results showed a reduced performance in both deposited conditions, with heat-treated material significantly outperforming as deposited material up to 538 °C.
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- The paper discusses a nondestructive method using energy-resolved neutron imaging to analyze the internal structure and material gradients of different metal-alloy welds, including those made from aluminum to steel and titanium to stainless steel with copper as a filler.
- Neutrons can penetrate thick metals, allowing researchers to study features like internal strain, microstructure, and defects that are not visible with traditional techniques.
- The study shows that this imaging method can provide detailed maps of the weld characteristics, such as texture, voids, and thermal front depth, which can help improve welding processes and material performance.