|About this Abstract
||Materials Science & Technology 2019
||Additive Manufacturing of Metals: Microstructure and Material Properties of Nickel-based Alloys
||Microstructure Stability of Inconel 718 in the Laser Powder Bed Fusion Process as a Function of Geometrical Features and Process Parameters
||John Sions, Melissa Tsui, Kyle Snyder, Richard Martukanitz, Cameron Gygi
|On-Site Speaker (Planned)
The solidification structure of Inconel 718 processed via laser powder bed fusion was investigated in a two-part study. In the first phase, part geometries containing features that could result in microstructural variations due to changes in solidification and cooling rates, such as thin walls or overhangs, were identified. Solidification cell sizes in the bulk material and at the feature of interest were measured using scanning electron microscopy. The feature with the largest microstructural variation was selected as the reference geometry for the second phase of the study. In this stage, process parameters were altered to locally control energy density to match the microstructure of the feature of interest to the bulk microstructure. It was found that the local microstructure could be altered by varying energy densities through changes in processing parameters, which in turn could be utilized to provide greater microstructural uniformity for builds representing a range of features.
||Planned: At-meeting proceedings