Prediction of Microstructure Evolution for Additive Manufacturing of Ti-6Al-4V

A key challenge for successful exploitation of additive manufacturing (AM) across a broad range of industries is the development of fundamental (PBF-LB) is identified as a key process for manufacture of metallic AM components. Ti-6Al-4V alloy is an important metal alloy for numerous microstructure prediction in PBF-LB manufacturing of Ti-6Al-4V, primarily focused on solid-state phase transformation and dislocation density evolution. The motivation is to quantify microstructure variables which control mechanical behavior, including tensile strength and ductility. A finite element (FE) based model of the process is adopted for thermal history prediction. Phase transformation kinetics for transient non-isothermal conditions are adopted and implemented within a stand-alone code, based on the FE-predicted thermal histories of sample material points. The evolution and spatial variations of phase fractions, a lath width and dislocation density are presented, to provide an assessment of the resulting microstructure-sensitivity of mechanical properties. (c) 2020 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the 23rd International Conference on Material Forming.