|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Applications of Solidification Fundamentals
||Effect of Kinetic Anisotropy on Microstructure Development during Simulated Powder Bed Fusion of 316L Stainless Steel
||Alexander F. Chadwick, Peter Voorhees
|On-Site Speaker (Planned)
||Alexander F. Chadwick
During additive manufacturing, typical melt pools may have hundreds of grains in contact with the solid-liquid interface. Each grain can have orientation-dependent solidification kinetics, which eventually leads to competitive grain growth and selection of preferred growth directions. Using the phase-field method and a Rosenthal solution, we have developed a physics-based (i.e., non-stochastic) model for the evolution of thousands of grains in three-dimensions for solidification in the absolute stability regime. We perform large-scale three-dimensional simulations of AM for a 316L surrogate to understand the complex interplay between the kinetic anisotropy, grain size, and laser power and speed on the resulting microstructure. From these simulations, we find that anisotropy has a strong effect only near the rear of the melt pool, but it directly impacts the time scale over which a grain solidifies and then becomes inactive. We also examine the resulting three-dimensional morphologies of individual grains after multiple laser passes.