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借助高温激光共聚焦显微镜,在线观察了不同Mn含量下无取向硅钢试样中的夹杂物析出、变化情况。结果表明,Mn含量为0.77%、0.32%时,对应试样的夹杂物数量分别为1 000万个/mm3、1 600万个/mm3。其中,0.77%Mn含量试样,夹杂物在1 115~1 098℃、1 068~1 032℃析出;0.32%Mn含量试样,夹杂物在1 086~1 068℃析出。0.77%Mn含量试样,优先析出球形、椭球形Mn S夹杂,其析出夹杂数量较少,尺寸较大,能有效抑制Al N、CuxS夹杂析出;0.32%Mn含量试样,优先析出相当数量Mn S夹杂,并作为Al N夹杂析出核心,形成Mn S+Al N复合夹杂。这种复合夹杂物数量较多,尺寸也较大。
With high-temperature laser confocal microscopy, the deposition and variation of inclusions in non-oriented silicon steel samples with different Mn contents were observed online. The results show that when the content of Mn is 0.77% and 0.32%, the number of inclusions corresponding to the sample is 10 million / mm3 and 16 million / mm3, respectively. Among them, the samples with 0.77% Mn content were precipitated at 1 115 ~ 1 098 ℃ and 1 068 ~ 1 032 ℃. The samples with 0.32% Mn content were precipitated at 1 086 ~ 1 068 ℃. The samples with 0.77% Mn content preferentially precipitate spherical and spheroidal MnS inclusions with less amount of precipitated inclusions and larger size, which can effectively inhibit the precipitation of Al N and CuxS inclusions. The sample of 0.32% Mn preferentially precipitates Mn S inclusions, and precipitated as Al N core, forming Mn S + Al N composite inclusions. This compound inclusions a large number of larger size.