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GRAIN BOUNDARY ENGINEERING FOR ADDITIVE MANUFACTURING

United States Patent Application

20180085830
A1
View the Complete Application at the US Patent & Trademark Office
In one embodiment, a method of manufacturing a metal part using a laser or electron beam during a powder bed additive manufacturing process includes melting each of a number of layers of metal powder of the metal part with an effective amount of energy using the laser or electron beam to form the metal part such that at least one or more portions of the metal part have a critical amount of residual strain. The method also includes performing a heat treatment on the metal part that transforms the residual strain into substantially distributed coincidence site lattice (CSL) grain boundaries, low angle grain boundaries, or both in the metal part.
Lou, Xiaoyuan (Rexford, NY), Dolley, Evan Jarrett (Clifton Park, NY), Morra, Martin Matthew (Schenectady, NY)
15/ 279,182
September 28, 2016
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH & DEVELOPMENT [0001] This invention was made with Government support under contract number DE-NE0008428 awarded by the United States Department of Energy. The Government has certain rights in the invention.