摘要
探究3.3％Si高强无取向硅钢再结晶组织与织构的演变及其对磁性能与力学性能的影响规律与机理.借助光学显微镜,扫描电镜分析冷轧-退火在不同阶段再结晶组织与织构,利用磁性能设备测试铁损与磁感应强度,万能拉伸试验机测试力学性能.结果表明,3.3％Si高强无取向硅钢冷轧后组织沿轧向呈纤维状分布,主要织构是{001}<110>织构,在900℃退火30 s发生部分再结晶,随着退火时间的延长,纤维状组织消失,得到等轴状铁素体,晶粒尺寸由7.8 μm增大到25.1 μm,{111}<112>与{111}<110>织构逐渐增强,退火时间为240 s时,形成了较强的{114}<481>织构,该织构能对γ织构有一定的抑制作用.实验钢在900℃退火120s时,磁性能与力学性能均最佳,屈服强度为527 MPa,高频铁损P1.0/400为18.79 W/kg,磁感应强度B5000为1.644T.
Abstract
We investigate the evolution of recrystallization structure and texture of 3.3％Si high-strength non-oriented silicon steel and its effect on magnetic and mechanical properties in this work.The recrys-tallization structure and texture at different stages of cold rolling and annealing were analyzed by optical microscopy and scanning electron microscopy.The iron loss and magnetic induction intensity were meas-ured by a magnetic energy equipment,and the mechanical properties were measured by a universal tensile testing machine.The results showed the microstructure of 3.3％Si high-strength non-oriented silicon steel is of a fibrous distribution along the rolling direction with main texture being {001}<110>.Partial recrystallization occurs when annealed for 30 s at 900℃.The fibrous microstructure disappears as the annealing time extends,and equi-ferrite was obtained.The grain size increased from 7.8 µm to 25.1 μm.The {111}<112>and {111}<110>textures gradually strengthen.The { 114}<481>texture formed when the annealing time is 240 s,which could inhibit the γ texture.The experimental steel achieves optimal magnetic properties and mechanical properties after annealing at 900℃ for 120 s,with a yield strength of 527 MPa,high frequency iron loss P1.0/400 of 18.79 W/kg,and magnetic induction inten-sity B5000 of 1.644 T.
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