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利用场发射扫描电镜、高分辨透射电镜和表面三维形貌仪对经预压力滚压表面纳米化处理的堆焊层的表面微观结构进行研究。结果表明,用中锰焊丝在Cr-Ni合金钢表面制备堆焊层,经滚压加工后,零件表面粗糙度明显降低,零件表面层形成厚度约10μm的明显塑性变形层;在最表层形成了平均晶粒尺寸约10 nm的具有随机取向的等轴晶,纳米晶粒的尺寸随距表面距离增加而增大;在距表面为10~15μm处,存在平均晶粒尺寸约100 nm的等轴晶和具有相近尺寸的胞状结构。预压力滚压加工在提高表面光洁度同时,能够有效地将堆焊层的树枝状晶细化为纳米晶。
The surface microstructure of the surfacing layer after pre-press rolling was treated by field emission scanning electron microscopy, high resolution transmission electron microscopy and surface three-dimensional profilometer. The results show that the surfacing layer of Cr-Ni alloy steel is prepared by medium-manganese wire, and the surface roughness of the part is obviously reduced after rolling. The apparent plastic deformation layer with the thickness of about 10μm is formed on the surface of the part; With an average grain size of about 10 nm with randomly oriented equiaxed grains, the size of the nanocrystalline grains increases with increasing distance from the surface; at a distance of 10-15 μm from the surface, there is an equiaxed grain with an average grain size of about 100 nm Crystalline and similar size of the cell structure. Pre-pressure rolling in improving the surface finish at the same time, can be effectively surfacing layer dendrite into nanocrystals.