Microstructure and Solute Concentration Analysis of Epitaxial Growth during Wire and Arc Additive Manufacturing of Aluminum Alloy

Microstructure and solute distribution have a significant impact on the mechanical properties of wire arc additive manufacturing (WAAM) deposits. In this study, multiscale model, consisting macroscopic finite element (FE) model microscopic phase field (PF) was used to predict 2319 Al alloy microstructure evolution with epitaxial growth. Temperature fields, corresponding temperature gradient under selected process parameters, were calculated by FE model. Based results thermal simulation WAAM process, PF misorientation angle employed simulate competitive behaviors effect growth grains. The dendrites high angles experienced tended be eliminated in solidification process. inclined are commonly hindered other grains front dendrite tip. Moreover, enrichment near solid/liquid interface reduced driving force solidification. increased angle, distributions had similar patterns, but various concentrations, different angles. Finally, metallographic experiments conducted specimen validate morphology size dendrites, electron backscattered diffraction indicate preferred orientation fusion line, proving existence