Revisit of Secondary Recrystallization Mechanism in Grain‐Oriented Electrical Steels: A Review

Grain‐oriented electrical steels, the key material for transformer cores, achieve their superior magnetic properties and reduced energy losses through secondary recrystallization (SR), which develops a sharp Goss texture ({110}⟨001⟩). This review first highlights key experimental findings on how Goss grain growth is influenced by the primarily recrystallized microstructure and high‐temperature annealing parameters. It then summarizes recent theoretical advances on the SR mechanism, provides critical assessments, and proposes a new framework. Unlike the conventional single‐factor mechanism that attributes SR solely to the enhanced mobility of Goss grain boundaries, the new framework emphasizes a dual‐factor mechanism based on the simultaneous minimization of both surface and interface energies.