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采用激光共聚焦扫描显微镜(CSLM)观察了不同酸溶铝(Al_s)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Al_s、S含量试样在冷却过程中出现了分阶段析出的异相组织。Al_s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Al_s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。Al_s含量的增加降低了取向硅钢热处理过程中的相转变温度。Al_s和S含量的差异引起钢中氧化物如SiO_2、Al_2O_3和MnS、Al N析出物数量及尺寸的差异,是导致钢的组织差异的根源。
The microstructure evolution of as-cast oriented silicon steel samples with different acid-soluble aluminum (Al_s) and sulfur contents was observed by laser confocal scanning microscope (CSLM). The mechanism of the microstructure evolution was analyzed. The results show that different Al_s, S content samples appeared in the cooling process phase segregated heterogeneous microstructure. When the Al_s content is 0.010%, the temperature of different phases precipitated in stages is 1188, 1099 and 933 ℃, respectively, which is higher than that of samples with Al_s content of 0.015% and 0.025% Heterogeneous number of organizations, and its average size smaller, so as to have a more uniform cast structure. The increase of Al_s content reduces the phase transition temperature during the heat treatment of oriented silicon steel. The difference of Al_s and S contents causes the difference of the amount and size of oxides in the steel, such as SiO_2, Al_2O_3, MnS and AlN precipitates, which is the root cause of the microstructure difference of steel.