Effects of electromagnetic stirring on the solidification structure and the solute distribution in the superalloy GH3030 billet during solidification process were experimentally investigated and analyzed.The solidification microstructure of GH3030 is composed of the single-phase austenite.Through electromagnetic stirring（EMS）

the dendrites are broken and the nucleation process is accelerated

which are responsible for the refinement of grains and compactness of the solidification structure.Without EMS

the serious microsegregation and the macrosegregation can be observed.With the EMS

temperature gradient at the solidification front is decreased as a result of improving heat transfer behavior in the melt during melt flow

and mixture of the melt with solute enrichment zone with the other melt zone is enhanced.As a result

the macrosegregation and the microsegregation of chromium in the billets are improved

and the chromium in the ingots with EMS is more uniformly distributed

improving significantly the quality of billets.