School of Mechanical and Electrical Engineering;
Central South University;
Changsha 410083;
China;
Light Alloy Research Institute;
Central South University;
Changsha 410083;
China;
State Key Laboratory of High Performance Complex Manufacturing;
Changsha 410083;
China;
College of Metallurgies and Energy;
North China University Science and Technology;
Tangshan 063009;
China;
Ni-based superalloy; Aging annealing; Recrystallization annealing; Grain refinement; Microstructural evolution; Mixed grain microstructure;