Invention Application
- Patent Title: GRAIN BOUNDARY ENGINEERING FOR ADDITIVE MANUFACTURING
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Application No.: US15279182Application Date: 2016-09-28
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Publication No.: US20180085830A1Publication Date: 2018-03-29
- Inventor: Xiaoyuan Lou , Evan Jarrett Dolley , Martin Matthew Morra
- Applicant: General Electric Company
- Main IPC: B22F3/24
- IPC: B22F3/24 ; B33Y10/00 ; B33Y80/00 ; B22F3/00 ; C21D1/34

Abstract:
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.
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