A low carbon steel was processed by Cold Rolling (CR) and Asymmetrical Rolling (ASR) at room temperature until 200 μm thickness reduction using multiple rolling passes of 25 μm. ASR process induced a soft curvature with a 45.7 mm length and 128.8 mm radius, while the CR process did not show any curvature. Materials showed differences in the strain path as well as in the texture and microstructure evolution, not only concerning the mode of deformation but also across the sheet thickness. The hardness and tensile tests indicated a higher strength after processing by ASR than CR for the same thickness reduction. Changes in dislocation densities and grain size were more pronounced in the surface neighborhoods of the material processed by ASR than the as-received (AR) and CR conditions, while the grain size and the dislocation densities of the CR material were more homogeneous across the sheet thickness. Synchrotron measurements allowed to build dislocations and crystal size distribution functions. These functions demonstrated that for the surface zones for ASR condition, high dislocation densities correspond to the grains developing rolling texture components. In contrast, the highest dislocations densities for the center zone formed inside the smallest crystals with shear texture orientations. By ASR, a heterogeneous material with hard surfaces was generated using multiple small thickness reductions in a narrow and thick sheet. In contrast, with CR, a homogeneous hardness increase was obtained throughout the sheet's thickness, avoiding curvature in the material. It was found that high and heterogeneous distributions of geometrically necessary dislocations (GNDs) across the sheet thickness were responsible for the ASR material additional hardening.

在室温下通过冷轧（CR）和不对称轧制（ASR）对低碳钢进行处理，直到使用25μm的多次轧制道次将厚度减小200μm。ASR工艺产生了45.7 mm长和128.8 mm半径的软弯曲，而CR工艺则没有任何弯曲。材料在应变路径，织构和微观结构演变方面显示出差异，不仅与变形模式有关，而且与板材厚度有关。硬度和拉伸试验表明，对于相同的厚度减小，ASR处理后的强度高于CR。在ASR处理的材料的表面邻域中，位错密度和晶粒尺寸的变化比原先的（AR）和CR条件更为明显，而CR材料的晶粒尺寸和位错密度在整个板厚上更为均匀。同步加速器测量允许建立位错和晶体尺寸分布函数。这些功能表明，对于ASR条件下的表面区域，高位错密度对应于晶粒形成的滚动织构成分。相反，在具有剪切纹理取向的最小晶体内部形成的中心区域的最高位错密度。通过ASR，在窄而厚的薄片中使用多次小的厚度减小产生了具有硬表面的异质材料。相反，使用CR可以在整个板材厚度上获得均匀的硬度增加，从而避免了材料的弯曲。