Effect of alternating current electric field on microstructure and properties of laser cladding Ni–Cr–B–Si coating
Effect of alternating current electric field on microstructure and properties of laser cladding Ni–Cr–B–Si coating
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DOI：
10.1016/j.ceramint.2019.05.230
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发表时间：
2019-10
影响因子：
5.2
通讯作者：
Lulu Zhai;Qian Wang;Junwei Zhang;C. Ban
中科院分区：
文献类型：
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作者：
Lulu Zhai;Qian Wang;Junwei Zhang;C. Ban
研究了交流电流对激光熔覆Ni-Cr-B-Si涂层的组织、形貌和性能的影响。实验结果表明，由于集肤效应和交流作用下熔池表面产生的交变电磁力，涂层表面形貌呈波浪状。电场作用可提高形核率，细化晶粒，使涂层底部组织由枝晶向等轴晶转变。然而，交流电并没有改变涂层中的相类型。此外，由于涂层底部的晶粒结构的细化，涂层中的裂纹数量减少了60%。在交流电场作用下，镀层的平均显微硬度提高，耐蚀性也得到改善。
The effects of alternating current (AC) on the morphology, microstructure and property of the laser cladding Ni–Cr–B–Si coatings were studied. The experimental results showed that the surface morphology of the coating was wavy due to the skin effect and the alternating electromagnetic force produced on the surface of the molten pool under the action of the AC. Electric field could increase the nucleation rate and refine grain size, thus the structure in the bottom of the coating transformed from dendrite to equiaxed crystal. However, alternating current did not change the phase type in the coating. Furthermore, due to the refinement of the grain structure at the bottom of the coating, the number of cracks in the coating was reduced by 60%. The average microhardness of the coating increased, and the corrosion resistance was also improved under the AC electric field.