Shin S M, Birosca S, Chang S K, De Cooman B C
Materials Design Laboratory, Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang 790-784, Korea.
J Microsc. 2008 Jun;230(Pt 3):414-23. doi: 10.1111/j.1365-2818.2008.02001.x.
The optimization of magnetic and physical properties of electrical steel is imperative for many engineering applications. The key factors to improve magnetic properties are the steel composition as well as control of the crystallographic orientation and microstructure of the steel during processing. However, this requires careful control of processing at all stages of production. Under certain conditions of deformation and annealing, electrical steel can be produced to have favourable texture components. For grain-oriented (GO) electrical steels that are used in most transformer cores, a pronounced {110} <001> Goss texture plays a vital role to achieve low power losses and high permeability. Essentially, Goss texture develops during secondary re-crystallization in GO electrical steels; however, the mechanism of the abnormal Goss grain growth is still disputed in the literature. In the current study, the influence of the annealing conditions on the development of annealing, cold rolling and re-crystallization textures of hot-rolled GO electrical steel were investigated in detail following each processing step. Furthermore, the orientation data from electron backscatter diffraction were used to evaluate the orientation-dependent stored energy of deformed grains after hot rolling. In the light of new findings in the present study, annealing and deformation texture development mechanisms were critically reviewed.
对于许多工程应用而言，优化电工钢的磁性能和物理性能至关重要。改善磁性能的关键因素包括钢的成分以及在加工过程中对钢的晶体取向和微观结构的控制。然而，这需要在生产的各个阶段对加工过程进行仔细控制。在一定的变形和退火条件下，可以生产出具有良好织构成分的电工钢。对于大多数变压器铁芯中使用的取向电工钢（GO），明显的{110}<001>高斯织构对于实现低功率损耗和高磁导率起着至关重要的作用。本质上，高斯织构在GO电工钢的二次再结晶过程中形成；然而，异常高斯晶粒生长的机制在文献中仍存在争议。在当前的研究中，详细研究了退火条件对热轧GO电工钢退火、冷轧和再结晶织构发展的影响，每个加工步骤之后均进行了研究。此外，利用电子背散射衍射的取向数据来评估热轧后变形晶粒的取向相关储能。根据本研究的新发现，对退火和变形织构发展机制进行了批判性综述。
