Tailoring Microstructure and Microsegregation in a Directionally Solidified Ni-Based SX Superalloy by a Weak Transverse Static Magnetic Field

A weak transverse static magnetic field (WTSMF, 0–0.5 T) is applied to the directional solidification process of a DD3 Ni-based SX superalloy, aiming tailor microstructure and microsegregation alloys. The mechanisms microstructural refinement distribution caused by WTSMF during are discussed. It shown that primary dendrite arm spacing rapidly reduced from 181 143 μm, average size γ′ phase significantly refined 0.85 0.25 μm as increases 0 0.5 T. At same time, volume fractions γ/γ′ eutectic segregation coefficient also gradually decreased. 3D numerical simulations multiscale convection in liquid show modifications mainly attributed enhanced flow thermoelectric (TEMC) at dendrite/sample scale under WTSMF. maximum TEMC with increasing intensity. This work paves simple way optimize directionally solidified superalloys without changing processing parameters composition.