![]() While the printing process wastes less material and can be used to produce more complicated shapes than traditional manufacturing methods, researchers have struggled to grasp how to steer metal toward particular kinds of crystals over others. “Basically, if we can control the microstructure during the initial steps of the printing process, then we can obtain the desired crystals and, ultimately, determine the performance of additively manufactured parts,” said NIST physicist Fan Zhang, a study co-author. Different crystal structures can emerge, each with their own pros and cons. The crystals determine the properties, such as toughness and corrosion resistance, of the printed part. During the first steps of printing with a metal alloy, wherein the material rapidly heats up and cools off, its atoms - which can be a smattering of different elements - pack into ordered, crystalline formations. The findings, published in Acta Materialia, unlock a computational tool for 3D-printing professionals, offering them a greater ability to predict and control the characteristics of printed parts, potentially improving the technology’s consistency and feasibility for large-scale manufacturing.Ī common approach for printing metal pieces involves essentially welding pools of powdered metal with lasers, layer by layer, into a desired shape. ![]() Using two different particle accelerator facilities, researchers at the National Institute of Standards and Technology (NIST), KTH Royal Institute of Technology in Sweden and other institutions have peered into the internal structure of steel as it was melted and then solidified during 3D printing. But a new breakthrough could grant an unprecedented level of mastery over metal 3D printing. Gaps in our understanding of what happens within metal during the process have made results inconsistent. Researchers have not yet gotten the additive manufacturing, or 3D printing, of metals down to a science completely.
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