为了探索金属薄板表面纳米化制备方法,本工作选取3％无取向硅钢热轧板进行表面机械研磨处理(SMAT)和异步轧制(CSR),研究深度方向结构和硬度的变化.结果表明:SMAT过程中,3％无取向硅钢通过位错的演变,在表面形成了等轴状、尺寸约为10 nm的、取向呈随机分布的纳米晶,纳米晶层厚度约为20 μm; SMAT样品经过CSR后,表面的显微组织基本不变,但纳米晶层的厚度明显减小；SMAT和CSR处理使表面硬度显著提高(约为85％).本工作表明,SMAT与CSR复合工艺可以制备大尺寸的、具有纳米结构表层的金属薄板.
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