Abstract Heatproof domain-refined grain-oriented (DRGO) silicon steel is an ideal material for the manufacture of S15-type ultra-high efficiency transformer with three-dimensional wound-core (TDWC). In this paper, the microstructure, grain orientation, and magnetic performance of 23ZDMH80 heatproof silicon steel during stress-relief annealing were investigated by scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) techniques. Based on heatproof DRGO steel, the Epstein-SST (single sheet tester) conversion factor and equivalent magnetic path length were calculated, and then an ultra-high energy efficiency transformer was developed. Results show that, the average size of micrograins in notched region increased from 42.3 μm to 68.2 μm after annealing at 850 ℃ for 0–8 h. The orientations of micrograins grown on large-size Goss grain included not only the non-〈0 0 1〉 orientations, such as {210} 〈−241〉, {215} , and {1 1 0}

中文翻译：

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耐热畴细化硅钢退火过程中微观结构和磁性能的演变及其应用

摘要 耐热畴细化晶粒取向（DRGO）硅钢是制造S15型超高效率三维绕线铁心（TDWC）变压器的理想材料。本文通过扫描电子显微镜(SEM)和电子背散射衍射(EBSD)技术研究了23ZDMH80耐热硅钢在去应力退火过程中的显微组织、晶粒取向和磁性能。以耐热DRGO钢为基础，计算Epstein-SST(single sheet tester)转换系数和等效磁路长度，研制出超高能效变压器。结果表明，在850 ℃下退火0-8 h后，缺口区域的微晶粒平均尺寸从42.3 μm增加到68.2 μm。