|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Quantifying Microstructure Heterogeneity for Qualification of Additively Manufactured Materials
||Effects of Processing Conditions and Build Geometry on Microstructure Development in Laser Powder Bed Fusion and Wire Arc Additively Manufactured 316L
||Charles Thomas Smith, Olivia Denonno, Matthew Schreiber, Anthony Petrella, Amy Clarke, Jonah Klemm-Toole
|On-Site Speaker (Planned)
||Charles Thomas Smith
Microstructure development in fusion-based additive manufacturing (AM) starts with solidification. The vastly different microstructures observed across various AM processes of a given alloy have their origins in thermal gradients (G) and interface velocities (V) during solidification. These values depend strongly on parameters such as laser power, scanning velocity, and layer height. However, other factors can affect the values of G and V; one such factor is the surrounding environment around the molten pool. For example, powder material can have different thermal properties from a solidified material of the same composition and can affect G and V of the solidifying front. In addition, material solidified from previous passes can provide residual heat, altering G and V. In this presentation, we show how different surrounding environments can influence G and V and thus the melt pool geometry and microstructure of AM parts in laser powder bed and wire arc additive manufacturing.