磁场退火对无取向硅钢再结晶织构和组织的影响

为了研究磁场退火对金属材料的再结晶织构和晶粒尺寸的影响,对冷轧无取向硅钢薄板进行了普通退火以及0.1,6和12 T下的磁场退火,磁场沿轧向施加.研究表明,磁场退火显著影响再结晶织构的取向密度和晶粒尺寸,且与磁感应强度成非线性关系.磁场退火增强有利的η(〈001〉∥RD)和{100}织构,减弱不利的γ(〈111〉∥ND)织构,该效应在6 T磁场下较显著;再结晶晶粒尺寸在6 T磁场退火时较大,普通及12T磁场退火时居中,0.1 T磁场退火时较小.从磁场降低晶界可动性和提供与取向相关的附加晶界迁移驱动力的角度,分析了磁场作用机制.

Effect of Magnetic Annealing on Recrystallization Texture and Microstructure of Non-oriented Silicon Steel

Cold-rolled non-oriented silicon steel sheets were annealed conventionally and magnetically at 0.1, 6 and 12 T, where the magnetic field was applied to them in the rolling direction. The results showed that the magnetic annealing process affects obviously the orientation density of recrystallization texture and grain size, and the annealing effect presents a nonlinear relationship with magnetic induction. Magnetic annealing tends to strengthen the favorable η (<00l> RD) and {100} fibers and weaken the unfavorable γ fiber, and the magnetic field at 6 T is more effective to optimize texture. Recrystallization grain size becomes larger under annealing at 6 T and smaller at 0.1 T in comparison with conventional and high field (12 T) annealing. A magnetic annealing mechanism is therefore proposed in view of lowering the grain boundary mobility and providing an additional orientation-dependent driving force for grain boundary migration.