EFFECT OF HORIZONTAL MAGNETIC FIELD ON THE MICROSTRUCTURE OF DIRECTIONALLY SOLIDIFIED Ni-BASED SUPERALLOY

Some problems still exist in the directionally solidified superalloy,such as coarse dendritic structure,thick second phase and composition segregation.Many efforts have been made to enhance the overall performance of superalloy by improving the components and processes.However, the higher alloying degree not only increases the solidification segregation,but also increases the tendency of precipitatingσ-phases,Laves-phases,μ-phases and other...