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对3%无取向硅钢进行表面机械研磨处理(SMAT),获得表面纳米结构,再进行550～650℃、4h固体粉末渗硅处理,用透射电镜(TEM)、扫描电镜(SEM)和X射线衍射仪(XRD)研究表层组织演变。结果表明:经过SMAT后,3%无取向硅钢表面晶粒尺寸降低至10nm左右,纳米晶层厚度约为20μm。经过550～650℃、4h渗硅处理后,SMAT样品表面形成化合物层,其厚度随着渗硅温度的升高由27μm增加到150μm。化合物层由FeSi和Fe3Si两相组成,其中FeSi相随着渗硅温度的升高而逐渐增加。
3% non-oriented silicon steel was subjected to mechanical surface treatment (SMAT) to obtain surface nanostructures. Silicon carbide powders were further siliconized at 550-650 ° C for 4h. Transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray diffraction (XRD) study of surface tissue evolution. The results show that the grain size of 3% non-oriented silicon steel decreases to about 10 nm after SMAT, and the thickness of nanocrystalline layer is about 20 μm. After 550 ~ 650 ℃ and 4h siliconizing, the compound layer was formed on the surface of SMAT sample, and its thickness increased from 27μm to 150μm with the increase of siliconizing temperature. The compound layer is composed of two phases of FeSi and Fe3Si, in which the FeSi phase increases gradually with the increase of the temperature of siliconizing.