Washington State University engineers have developed a new 3D printing method that enables the creation of structures using two different metals in a single circular layer. Drawing inspiration from the strength of trees and bones, the engineers utilized two welding machines to print bimetallic materials that exhibited 33% to 42% greater strength than either metal individually. The method employs readily available and affordable tools, making it feasible for manufacturers and repair shops to adopt in the near future.
The innovative technique holds immense potential for various applications. It could be utilized in the production of high-performance medical implants and components for space technology, offering a significant advancement in these fields. By leveraging the interaction between layered rings of different materials, similar to natural structures, the researchers successfully combined a hard material with a soft material, opening up new design possibilities.
Unlike existing 3D printing methods that require stopping and changing metal wires, this approach allows for the simultaneous printing of multiple metals in the same layer while they are still hot. The circular deposition of metals enables a unique bonding mechanism, as one material “bear hugs” the other, resulting in enhanced strength.
The implications of this advancement extend to automotive applications, where it could enable the rapid production of strong and customized steel parts. Additionally, the researchers envision medical manufacturing processes that incorporate durable titanium with inner materials possessing healing properties, as well as the creation of space structures with high-temperature resistant exteriors and cooling properties for temperature control.
The Washington State University team has filed a provisional patent application for their groundbreaking method. Supported by the National Science Foundation, this research represents a significant step forward in the field of 3D printing, offering a versatile and cost-effective solution for creating complex structures with enhanced mechanical properties.
You can read the full research paper, titled “Radial bimetallic structures via wire arc directed energy deposition-based additive manufacturing” in Nature Communications, at this link.
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