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以激光熔覆法在低硅钢表面制备出高硅含量的Fe-Si涂层.用扫描电镜、透射电镜、M(?)ssbauer谱、X射线衍射等方法研究了硅钢基体和熔覆涂层的微观组织和室温超精细结构及其变化,结果表明,涂层与基体结合良好,自结合界面起至熔覆涂层表面的显微组织依次为平面晶、柱状树枝晶和细小树枝晶组织;熔覆涂层中存在6种可区别的Fe原子组态;涂层中含Si主要相为α-Fe类型相,以无序固溶体形式存在,其相对含量占69.6%(体积分数);α-Fe类型相中随Fe原子近邻Si原子数的增加,同质异能移位值增大,超精细磁场值减小.
The Fe-Si coating with high silicon content was prepared by laser cladding on the surface of low silicon steel. The microstructure and mechanical properties of the Fe-Si coating were studied by scanning electron microscopy, transmission electron microscopy, Mossbauer spectroscopy and X-ray diffraction Microstructure and room temperature ultrafine structure and its changes were studied. The results show that the coating is well bonded with the matrix. The microstructures of the coating surface from the bonding interface to the coating surface are in the form of planar crystal, columnar dendrite and fine dendritic structure. There are six kinds of distinguishable Fe atoms in the overcoated layer. The main phase containing Si in the coating is α-Fe phase, which exists in disordered solid solution with the relative content of 69.6% (volume fraction) With the increase of the number of Si atoms near the Fe atom in the type phase, the displacement of homogenous energy increases and the value of the ultrafine magnetic field decreases.