对低碳钢进行表面机械研磨处理（SMAT），研究组织变化及其对性能的影响。结果表明：经过SMAT后，低碳钢上形成了厚度约为40 μm的纳米组织表层，在深度为40~80 μm处获得亚微晶组织；表面纳米化不仅提高了低碳钢表面的硬度和耐磨性，而且在不明显降低韧性的前提下提高了板材的整体强度；在纳米到微米量级的范围内，晶粒尺寸与硬度之间满足HallPetch关系。
The structural evolution of low carbon steel sheet treated by means of surface mechanical attrition treatment (SMAT) and its effects on the property were investigated. Experiment results show that, a surface layer with nanosized grains about 40 μm in thickness and microsubgrained layer at a depth of 40~80 μm can be obtained after SMAT. The formation of the surface layer with nanosized grains can enhance not only the hardness and wear resistance of the surface layer, but also the total yield strength of the sheet without obvious reduction of ductility. The relationship between grain size and hardness fulfills the HallPetch formula within a wide range of grain size from nanometers to micrometers.
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