Abstract

Nonoriented electrical steel of 0.65 mm thickness was sheared to investigate the influence of guillotine clearance on cut-edge damage. The result shows that all the burr, work hardening, and magnetic property damage present an increasing trend initially, then a decrease, followed by an increase with increasing guillotine clearance. In particular, when the relative guillotine clearance (c/t) is within 4.6-6.2%, the burr is small and the cut edge is only slightly damaged. Damage to the burr, work hardening, and magnetic properties are influenced and inter-correlated. The plastic deformation of the microstructure at different c/t ratios is the decisive factor affecting burr forms and cut-edge damage. On the one hand, it leads to different degrees of work hardening and then results in a diversity of crack propagation patterns, forming burr and cross-sectional morphologies with different shapes. On the other hand, the stress distribution and grain orientation also change, which further influences the magnetic properties. Moreover, the relationship between microstructure deformation and grain orientation was established by analyzing texture occupancy and orientation distribution function diagrams. It is clarified that both nucleation position evolution and edge stresses generated by different clearances contribute to the evolution of grain orientation and texture.

中文翻译：

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断头台间隙对无取向电工钢刃口损伤的影响

抽象的

剪切厚度为0.65 mm的无取向电工钢，以研究断头台间隙对尖端损坏的影响。结果表明，所有的毛刺，加工硬化和磁性能损伤都呈现出增加的趋势，然后减少，然后随着断头台间隙的增加而增加。尤其是，当相对断头台间隙（c / t）在4.6-6.2％之内时，毛刺很小，并且切割边缘仅受到轻微损坏。毛刺的损坏，加工硬化和磁性能会受到影响并且相互关联。不同c / t时组织的塑性变形。比率是影响毛刺形式和尖端损坏的决定性因素。一方面，它导致不同程度的加工硬化，然后导致裂纹扩展方式的多样性，形成具有不同形状的毛刺和横截面形态。另一方面，应力分布和晶粒取向也改变，这进一步影响了磁性能。此外，通过分析纹理占有率和取向分布函数图，建立了显微组织变形与晶粒取向之间的关系。可以明确的是，成核位置的演变和由不同间隙产生的边缘应力都有助于晶粒取向和织构的演变。