Numerical modeling of power-down directional solidification process of Ti–46Al–8Nb refractory alloy

The work represents a brief outline of developed GIGAN computing code and its application for 2D-description of power-down directional solidification (DS) process applied recently in the course of laboratory R&D of new structural TiAl-based alloys. The temporal temperature field mapping, macro-scale study of melt hydrodynamics, heat-mass transfer, segregation effects, mushy zone evolution and solidification dynamics of TiAl–Nb melt/solid system have been performed numerically for set of DS trials being implemented virtually at different operational regimes and gravity environment. As the example of noteworthy numerical study results, the explanation of centerline peritectic segregation effect in Ti–46Al–8Nb ingots is mentioned, as well as the applied model verification using benchmark DS of TiAl–Nb alloy in microgravity aboard the MAXUS-8 ESA sounding rocket.

► GIGAN software is developed for modeling of multi-component alloy melt solidification.
► TiAl–Nb directional solidification modeling at various thermal and gravity conditions.
► Software allows study of convection-induced microstructure and segregation.
► Dendrite growth kinetics is numerically traced in microgravity.