无取向硅钢中的夹杂物析出在线观察

In-situ Observation on Precipitation of Inclusion in Non-oriented Silicon Steel

借助高温激光共聚焦显微镜,在线观察了不同Mn含量的无取向硅钢中夹杂物的尺寸、类型、数量变化。结果表明,Mn含量(质量分数)为0.77%、0.32%时,试样中的夹杂物数量分别约为1000万个/mm3、1600万个/mm3。Mn含量较高的钢种,会优先析出球形、椭球形MnS夹杂物,其析出数量较少,尺寸相对较大,可以有效抑制AlN、CuxS夹杂物析出;Mn含量较低的钢种,会在试样再加热后冷却过程中,先析出相当数量MnS夹杂物,并作为AlN夹杂物析出核心,形成MnS+AlN复合夹杂物。这种复合夹杂物数量较多,尺寸也较大。

Based on the high temperature confocal microscope, the chage of size, type, and quantityof inclusions in non-oriented silicon steels with different Mn content were observed by in-situSEM. Results show that the inclusion quantities are 10 million per mm3 and 16 million per mm3,while the mass fractions of Mn are 0.77% and 0.32% , respectively. In the silicon steel withhigher Mn content, the spherical and ellipsoidal MnS inclusion will precipitate first, which canretard the precipitation of AlN and CuxS effectively. The quantity of the inclusion is smaller, whilethe size is larger. On the other hand, in the silicon steel with lower Mn content, the MnSinclusion will precipitate first, which can be adopted as the core of AlN inclusion to form thecomplex inclusion, MnS and AlN, during the reheating and cooling process. Both the quantity andthe size of the complex inclusion are larger.