Abstract: Planar flow casting technique can be used to prepare Fe⁃3 %Si ribbons. This study investigated the annealing microstructure, texture, and magnetic properties evolution of Fe⁃3 %Si ribbons with a thickness of ~0.05 mm prepared by planar flow casting. The results show that ultra⁃fine microstructures are observed on both the wheel surface and free surface of the planar flow casting ribbons, with the texture primarily characterized by {001}(<001>//ND) and copper ({112}<111>) texture. During annealing, annealing temperature significantly influences the microstructure evolution. That is, when annealed at 950 ℃, grain growth on both surfaces of the Fe⁃3 %Si ribbons is limited; when the annealing temperature increases to 1 050 ℃, some grains exhibit strong growth advantages, while a number of fine grains still remain after being annealed for 3 hours. Overall, the type of main texture components does not change along annealing, and the enhancement of {001} texture implies the growth advantage of {001} grains. In terms of magnetic properties, the magnetic induction B₅₀₀₀ remains~1.68 T before and after annealing. When annealed at 950 ℃, prolonging annealing time does not lead to significant changes in the iron loss P_1.0/400, whereas at 1 050 ℃, the iron loss gradually decreases from >40 W/kg to ~20 W/kg due to the microstructural coarsening with the extended holding time.

Key words: planar flow casting, Fe?3 %Si, annealing, microstructure, texture, magnetic properties