采用表面机械研磨技术在低碳钢上制备出纳米结构表层,利用X射线衍射和电子显微分析研究表层的结构特征,并对硬度沿厚度方向的变化进行分析.结果表明:经过表面机械研磨处理后,样品表层的晶粒可细化至纳米量级.表面纳米晶层的厚度约为40μm,平均晶粒尺寸由10nm逐渐增加到100nm;在距表面约40-80μm的深度为亚微晶层,平均晶粒尺寸进一步增至1000nm.与样品的心部相比,表层的硬度显著提高.
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