|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Application of Solidification Fundamentals to Challenges in Metal Additive Manufacturing
||Simulating Grain Formation during Metal Additive Manufacturing (AM): Potential Pathways for Producing Equiaxed Grain Structures
||David StJohn, Arvind Prasad, Lang Yuan, Peter Lee
|On-Site Speaker (Planned)
The nucleation and development of equiaxed grains during metal additive manufacturing (AM) is hindered by the steep temperature gradients and fast cooling rates typical of AM processes. The factors that enhance nucleation are potent nucleant particles, alloy system (solute diffusion rate), alloy composition for a given alloy (in particular high growth restricting alloy additions) and the solidification conditions (e.g. lower temperature gradient). We present the results of a modelling method, MatIC, that simulates the effect of nucleation undercooling of potent particles, the alloy system and composition, and temperature gradient on the nucleation of grains. Through a sensitivity analysis, a study of the effect of these parameters on grain formation was undertaken. The results of this study highlight the limitations in achieving an equiaxed grain structure and possible approaches to promote equiaxed grain formation during AM.
||Planned: Supplemental Proceedings volume