中文摘要：

利用FE-SEM、EDS分析了含不同抑制剂成分的成品取向硅钢中夹杂物的组成和形貌，统计其尺寸及数量分布；结合对磁性能测试的结果，分析了Sn、Cu、Nb和Cr对取向硅钢磁性能影响的机理。结果表明：含Sn的取向硅钢试样中夹杂物主要为块状的微米级Al-Ti-C-N-O复合物，还有少量的球形Al-N-O颗粒和块状Ti-C-N-O颗粒，棒状夹杂物较少；含Cr的取向硅钢试样中夹杂物主要为球形的微米级Al2O3，还有少量Cu-Al-N-O-S复合物，棒状夹杂物和不规则夹杂物均较少；含Cr试样中1～3μm夹杂物的平均尺寸较含Sn试样小，但数量多，而大于3μm夹杂物的平均尺寸较含Sn试样大，但数量很少。磁性能测试结果表明，外场为800 A/m和2500 A/m时，含Cr试样磁感应强度偏低，铁损值P1.7/50较含Sn试样高，为1.171 W/kg。

英文摘要：

The composition and morphology of inclusions in the finished grain-oriented silicon steels are analyzed by using FE-SEM and EDS, and the number density and size distribution of the inclusions are counted. The influence mechanism of Sn, Cu, Nb, and Cr on the magnetic properties of the steel is also discussed. Results show that the inclusions composition in the grain-oriented silicon steel samples containing Sn is mainly block Al-Ti-C-N-O, compounding with a few spherical Al-N-O and block Ti-C-N-O. A small amount of rod-like inclusions in the steel are found. The inclusions composition is mainly spherical Al2O3 with a small amount of Cu-Al-N-O-S in the grain-oriented silicon steel samples containing Cr. Rod-like inclusions and irregular shape inclusions are less. Compared with the samples containing Sn, the average grain size of the samples containing Cr is larger, but the amount is less. The magnetic flux density of the samples containing Cr is lower than that of samples containing Sn at 800 A/m and 2500 A/m, while the core loss is higher at P1.7/50 and its value is 1.171 W/kg.