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进行了2Cr13不锈钢表面激光熔覆镍包纳米氧化铝的实验。使用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、X射线能量色散谱仪(EDAX)、显微硬度仪等设备检测了涂层表面、横截面的显微组织和涂层的硬度、耐磨损等性能,分析了加入纳米氧化铝粒子后对涂层组织和性能的影响。研究结果表明,激光熔覆可获得致密的Fe-Ni(Cr)合金和Al2O3粒子复合涂层。其中,纳米氧化铝粒子弥散分布在微细合金晶粒之间,并与合金晶粒一起形成了胞状树枝晶结构。纳米氧化铝粒子的加入增加了基质金属的成核率,起到了细晶强化以及弥散强化的作用,使得复合涂层的机械性能大幅度提高。复合涂层的平均硬度为700HV0.2,比基体提高了1.5倍,耐磨损性能比淬火态基体提高了1.25倍。
The experiment of laser cladding nickel-coated nano-alumina on 2Cr13 stainless steel was carried out. The surface of the coating, the microstructure of the cross section and the hardness of the coating were examined by using scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDAX) Wear resistance and other properties, analysis of the nano-alumina particles added to the coating on the organization and performance. The results show that laser cladding can obtain compact Fe-Ni (Cr) alloy and Al2O3 particle composite coating. Among them, the nano-alumina particles dispersed in fine alloy grains, and together with the alloy grains to form a cellular dendritic structure. The addition of nano-alumina particles increases the nucleation rate of the matrix metal, plays a role of fine grain strengthening and dispersion strengthening, so that the mechanical properties of the composite coating are greatly improved. The average hardness of the composite coating 700HV0.2, 1.5 times higher than the matrix, wear resistance than quenched matrix increased by 1.25 times.