中文摘要：

采用激光共聚焦扫描显微镜（CSLM）观察了不同酸溶铝（Als）和硫含量的铸态取向硅钢试样在高温下的组织演变过程,分析了其影响机理。结果表明,不同的Als、S含量试样在冷却过程中出现了分阶段析出的异相组织。Als含量为0.010%的试样冷却过程中分阶段析出异相组织的温度分别为1188、1099、933℃,比Als含量为0.015%和0.025%的试样析出温度高,长大的速度慢,异相组织数量多,且其平均尺寸更小,从而具有更均匀的铸态组织。Als含量的增加降低了取向硅钢热处理过程中的相转变温度。Als和S含量的差异引起钢中氧化物如SiO2、Al2O3和MnS、AlN析出物数量及尺寸的差异,是导致钢的组织差异的根源。

英文摘要：

Microstructure evolution of as cast grain-oriented silicon steel specimens with different acid soluble aluminum （Als） and sulfur contents at high temperature was observed by using confocal scanning laser microscope （CSLM）,and the effect mechanism was analyzed. The results indicate that the heterogeneous microstructure of the grading precipitation appears in samples with different Als and S contents during cooling process. The temperatures of the heterogeneous microstructure of the grading precipitation in samples containing 0.010% A1, during cooling process are 1188, 1099 and 933 ℃ respectively. It is higher than those samples containing 0.015% and 0.025% Als, the rate of growth is slower, the amount of heterogeneous phase is more, and the average size is smaller, so as to have a more uniform as cast microstructure. The increase orAl, content decreases the phase transition temperature of the oriented silicon steel during heat treatment. The difference of AI, and S contents causes the difference of the amount and size of the oxideand precipitates, such as SiO2, Al2O3 and MILS, AIN in steel, which is the root cause of the difference of the steel mocrostructure.