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采用超音速轰击技术(Supersonic Fine Particles Bombarding,SFPB)对调质态合金钢38CrSi进行表面纳米化处理,在材料表面制备了纳米结构表层;利用X射线衍射、扫描电镜和透射电镜等分析技术研究了表面纳米层的微观结构特征。结果表明:经SFPB处理后,材料表层发生了严重的塑性变形,表面形成了晶粒尺寸约为15nm的纳米结构层,微观应变约为0.19%;表面纳米层的厚度约为20μm(晶粒尺寸<100nm),纳米晶粒的尺寸随着距表面距离的增加而增大;在距表面40μm的范围内,高密度的位错墙和位错缠结将晶粒分为了尺寸为200～400nm的胞块结构,分析表明表面纳米化主要是位错运动的结果。
The surface of the quenched and tempered alloy steel 38CrSi was surface-treated with Supersonic Fine Particles Bombarding (SFPB), and the nanostructured surface layer was prepared on the surface of the material. X-ray diffraction, scanning electron microscopy and transmission electron microscopy were used to analyze the surface Microstructural Features of Nano-Layers. The results show that the surface of the material undergoes serious plastic deformation after SFPB treatment, and the nanostructured layer with a grain size of about 15nm is formed on the surface with a micro strain of about 0.19%. The thickness of the surface nanometer layer is about 20μm (grain size <100nm). The size of nanocrystalline grains increases with the distance from the surface. In the range of 40μm from the surface, the high density of dislocation walls and dislocation entanglement separate the grains into sizes of 200 ~ 400nm Cell structure, analysis shows that the surface nanocrystallization is mainly the result of dislocation movement.