|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Advanced Characterization of High-temperature Alloys: Phase Evolution during Manufacturing and Service-induced Deformation
||Microstructural control of LPBF Inconel 718 through post processing of intentionally placed AM discontinuity distributions
||Elaine Livera, Katerina Christofidou, Daniel Ryan, Iain Todd
|On-Site Speaker (Planned)
A major untapped potential of laser powder bed fusion (LPBF) is the ability to additively manufacture (AM) parts with site-specific properties. However, robust methods of improving performance and manufacturing efficiency via spatial variations in microstructure are underexplored.
This work introduces a novel method of creating multi-modal microstructures in IN718 by performing a Hot Isostatic Pressing (HIP) procedure on characteristic LPBF discontinuities such as keyhole and lack of fusion porosity, as well as large powder filled voids. Observed using electron backscattered diffraction, this approach enables the formation of site-specific variations in microstructure and extreme bi-modal microstructures in which grains differ in area by 194%. Additionally, as opposed to the typical anisotropic AM microstructures, this method facilitates the production of fully dense, equiaxed and strain free materials culminating in a 62% energy saving, and 47% time saving per layer.
This work was supported by the UK Engineering and Physical Sciences Research Council [EP/L016273/1] and Solar Turbines Incorporated.
||Mechanical Properties, Process Technology, Other