|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Nano/Micro-mechanics and Length-scale Phenomena
||Deformation and Microstructure Development in DED-AM Structures via Dark Field X-ray Microscopy and In Situ Imaging
||Yunhui Chen, Yuanbo Tang, David Collins, Samuel Clark, Wolfgang Ludwig, Raquel Rodriguez-Lamaz, Carsten Detlefs, Roger Reed, Can Yildirim, Peter D. Lee, Philip Withers
|On-Site Speaker (Planned)
The mechanical performance of Directed Energy Deposition Additive Manufactured (DED-AM) components are highly process condition dependent due to rapid laser induced heating and cooling rates. However, the non-equilibrium solidification process and its resulting grain structure are not easily measured by conventional techniques. Here high angular resolution Dark Field X-ray Microscopy (DFXM) is used to quantify the DED-AM microstructure including the 3D distribution of strains, lattice misorientation and Geometrically Necessary Dislocations (GNDs) in a novel nickel base superalloy. Microstructure development is explored via solidification sequence modelling, which is calibrated by in situ synchrotron imaging of the manufacturing process in real time using a unique DED-AM process replicator. Strain and crystal orientation are found to be decoupled; with sub-grain orientations correlated to thermal gradients whereas high strains are homogeneously distributed. The results presented here provide an enhanced fundamental understanding of the DED-AM process with relevance to microstructure control in AM fabricated components.
||Additive Manufacturing, Characterization, Copper / Nickel / Cobalt