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采用快速多重旋转碾压(FMRR)的方法对45钢表面进行纳米化处理,同时利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射仪(XRD)以及电子显微硬度计对试样表层的塑性变形和纳米结构进行表征。试验结果表明:FMRR处理后45钢表层发生严重的塑性变形,变形层约为20μm,变形具有方向性;晶粒变得细小,达到纳米量级,呈随机分布,晶粒尺寸约为100 nm,部分晶粒被拉长成条状;没有新相的产生,晶粒的细化致使衍射峰明显宽化;明显提高了材料的表面显微硬度;这种方法为金属材料表面强化提供科学的途径。
The surface of 45 steel was nano-treated by fast multiple rolling (FMRR) method. Meanwhile, the surface morphology of 45 steel was analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and electron microhardness The plastic deformation of the sample surface and nanostructures were characterized. The experimental results show that the surface layer of 45 steel undergoes severe plastic deformation after FMRR treatment, the deformation layer is about 20μm and the deformation is directional. The grains become small and reach nanometer order, with random distribution. The grain size is about 100 nm, Part of the grains are elongated into strips; no new phase is generated, the grain refinement causes the diffraction peaks to broaden obviously; the microhardness of the surface of the material is obviously increased; this method provides a scientific way for the surface strengthening of metal materials .