Phase field modeling of partial remelting during reheating of a multiphase peritectic solidification microstructure

While they are known for years to be the main source of equiaxed grains in metallurgical processes such as casting, melting and remelting phenomena currently receive an increasing attention owing developments additive manufacturing. In multiphase alloys, i.e. having a eutectic or peritectic microstructure, these still remain poorly documented. this work, solidification subsequent alloys have been studied using phase field simulations, with emphasis on influence equilibrium, that yields reaction L+β→α below temperature reverse α→L+β above. During solidification, growth α has little pro-peritectic β phase. On other hand, evolution during previously solidified microstructure is more complex involves gradient zone liquid film migration phenomena. Close temperature, driven by migration, some scenarii evidenced depending whether takes place without triple junction from pure along α/β interface. At scale mushy zone, Temperature Gradient Zone Melting phenomenon also occurs but remains incomplete at time investigated here. Finally, new mechanism fragmentation, induced remelting, identified.