|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Application of Solidification Fundamentals to Challenges in Metal Additive Manufacturing
||Crystal Growth in Face-centred-cubic Alloys Made by Additive Manufacturing: Epitaxial Growth, Branching and Splitting
||Bogdan Dovgyy, Alessandro Piglione, Chen Liu, Paul Hooper, Minh-Son Pham
|On-Site Speaker (Planned)
Making high quality and reliable metals still remains one of the biggest challenges in additive manufacturing (AM) of metals because of the lack of in-depth understanding of microstructures in AM metals, in particular regarding the solidification microstructural condition in rapid cooling. In this study, we present our fundamental study to understand the crystal growth in rapid cooling of FCC alloys made by AM. Crystal grains in meltpools are often seen to epitaxially grow from existing grains. The rapid cooling in AM results in extremely fine rod-like solidification cells. The direction of existing cells and the thermal gradient are two governing variables for the growth of crystals in the new meltpool, leading to the complex branching or the nucleation of cells at meltpool boundaries and inside meltpools. Moreover, the crystallographic orientation relationship between parent cells and branched (or newly nucleated) cells will be presented in this study.
||Planned: Supplemental Proceedings volume