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在低碳钢基底表面激光熔覆Ni60AAA与镍包铝的混合粉,利用扫描电镜、能谱仪以及X射线衍射等分析手段对涂层组织结构进行了分析。结果表明,涂层主要包含γ-Ni、Ni3Al、Cr23C6和CrB相,其中先共晶γ-Ni为主要基体相,呈树枝晶形貌,Ni3Al相也呈树枝晶形貌,游离、均匀分布于涂层;共晶体呈网状分布于两种树枝晶的晶界上;适当提高熔覆功率可以改善涂层的成形性及表面质量,在2.2 kW功率下,Ni60AAA与镍包铝激光合金涂层完整、致密,涂层与基体实现了完全冶金结合。
The microstructure of the coating was analyzed by laser scanning electron microscopy (SEM), energy dispersive spectrometer (XRD) and X-ray diffraction (XRD). The results show that the coating mainly contains γ-Ni, Ni3Al, Cr23C6 and CrB phases. The first eutectic γ-Ni is the main matrix phase, dendritic morphology and Ni3Al phase dendritic morphology, free and uniform distribution Coating; the eutectic was distributed in the network of two kinds of dendrite grain boundaries; appropriate increase in cladding power can improve the coating formability and surface quality, at 2.2 kW power, Ni60AAA and nickel-clad aluminum laser alloy coating Complete, dense, complete metallurgical bond with the substrate.