|About this Abstract
||7th World Congress on Integrated Computational Materials Engineering (ICME 2023)
||Columnar to Equiaxed Transition During Solidification Under Additive Manufacturing Conditions
||Bala Radhakrishnan, Tahany El-Wardany, Ranadip Acharya
|On-Site Speaker (Planned)
We present phase field (PF) simulations of the columnar to equiaxed transition (CET) occurring during solidification of Ti-Cu and Ni-Fe-Nb alloys under thermal conditions characteristic of powder fusion based additive manufacturing techniques. The PF simulations will involve direct coupling to alloy thermodynamics and a thermodynamically consistent nucleation model. The simulations are able to capture the transition from a solute-diffusion driven constitutional undercooling to thermal undercooling driven nucleation ahead of the epitaxial solidification front under AM conditions. A parametric study is presented under varying G and R conditions and alloy composition to capture the conditions under which the above transition occurs. This research was performed at the Oak Ridge National Laboratory under contract DE-AC05-00OR22725 with the United States Department of Energy (USDOE) and was supported by the High-Performance Computing for Manufacturing (HPC4Mfg) and the Exascale Computing Project (ECP) programs sponsored by the USDOE.