利用激光熔覆在45#钢表面制备不同铌含量的镍基合金复合涂层.使用扫描电镜(SEM)、X射线衍射(XRD)仪等仪器分析涂层横断面的显微组织.结果表明:铌改性的镍基合金复合涂层不仅含有γ-Ni树枝晶、枝晶间的共晶组织、CrB型硼化物,还含有大量的弥散分布NbC颗粒.Nb元素的添加,使镍基合金复合涂层中的碳化物以NbC颗粒和M<,23>C<,6>型碳化物形式析出,抑制了纯镍基合金涂层中粗大的M<,7>C<,3>型碳化物的大量析出.复合涂层的显微结构和相的转变改善了其耐磨损性能,并且镍基合金复合涂层的显微硬度和耐磨损性能随着铌含量的提高而提高.
The nickel-based alloys with different Nb contents were deposited on AISI 1045 carbon steel by laser cladding. The effect of Nb on the microstructures of the nickel-based alloy coatings was investigated using scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The result show that the microstructures of the Nb-modified nickel-based alloy coatings are mainly composed of γ-Ni dendrites, interdendritic eutectics, CrB type chromium borides, and dispersed NbC particles. It is found that the addition of Nb will lead to the precipitation of the NbC particles and M<,23>C<,6> type carbides instead of the M<,7>C<,3>, and M<,23>C<,6> type carbides can be observed in the Nb-free nickel-based alloy coating. The microhardness and wear resistance of the coatings increase with the increase of Nb contents. The improvement of the wear resistance of the Nb-modifled nickel-based alloy coatings is attributed to the microstructural change and phase variation.
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