文摘
Friction stir welding was successfully applied to super-austenitic stainless steel S32654. Grain structure evolution in stir zone is dominated by continuous dynamic recrystallization. Strain rate plays a dominated effect on grain refinement. Grain refinement, high density dislocations and substructures together improve hardness and strength, but reduce elongation. The more suitable welding parameters are determined as 300 rpm and 100 mm/min for this steel.