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3D printing eliminates undesirable trait in conventional superalloys

3D printing eliminates undesirable trait in conventional superalloys

Written by David

December 6, 2018

UNIVERSITY PARK, Pa. — An undesirable trait found in traditionally processed superalloys does not exist in a 3D-printed, nickel-based superalloy, according to a team of materials scientists who think this could lead to new manufacturing techniques that allow for alloys with tailored properties. The trait, called dynamic strain aging (DSA), occurs in metals at high temperatures subjected to stress. In conventionally processed materials, if DSA is present, the strength of the material fluctuates with applied deformation, resulting in serrated stress-strain curves. Researchers, led by Allison Beese , assistant professor of materials sciences and engineering at Penn State, tested the 3D-printed Inconel 625 versus traditionally processed Inconel 625 using neutron diffraction characterization with mechanical testing at Oak Ridge National Laboratory. Data gathered at the microscopic level gave a picture of the grain-level origins of the serrated stress curve, and resulted in a new understanding of the microstructure mechanisms that drive […]

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