利用机械研磨处理(SMAT)在冷轧IF钢表面制备出具有纳米晶体结构特征的表面层.利用金相观察和透射电镜分析研究了表面纳米层的结构特征,测定了硬度沿厚度的变化,并分析了表面纳米化(SNC)对力学性能的影响.结果表明:(1)表面机械研磨处理后,冷轧(CR)IF钢表面形成了平均晶粒尺寸为7～9nm、晶粒取向呈随机分布的纳米晶组织;(2)表面层附近的硬度显著提高;(3)纳米表层的存在使得材料强化的同时成形极限也得到提高.
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