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采用激光熔覆技术在Q235钢表面制备Fe-Al复合涂层和Fe-Al-Si复合涂层。利用X射线衍射仪和扫描电镜等方法分别研究两种涂层的物相和微观组织,并测试其显微硬度和耐磨性,同时进行对比分析。结果表明:Fe-Al复合涂层主要由Fe、Al、Al2O3、Fe3Al等相组成,而Fe-Al-Si复合涂层主要由Fe、SiO2以及Al2Fe3Si4等相组成;Fe-Al复合涂层内部存在孔隙缺陷,而Fe-Al-Si复合涂层内部无裂纹、气孔等,组织更均匀细小,与基体之间冶金结合良好;Fe-Al-Si复合涂层的显微硬度和耐磨性均约为Fe-Al复合涂层的1.8倍。
Laser cladding technology was used to prepare Fe-Al composite coating and Fe-Al-Si composite coating on Q235 steel. The phase and microstructure of the two coatings were studied by means of X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. The microhardness and wear resistance of the two coatings were also tested. Meanwhile, the comparative analysis was carried out. The results show that the Fe-Al composite coating mainly consists of Fe, Al, Al2O3 and Fe3Al phases, while the Fe-Al-Si composite coating mainly consists of Fe, SiO2 and Al2Fe3Si4 phases. However, the Fe-Al-Si composite coating has no internal cracks, pores and the like, the microstructure is more uniform and fine, and the metallurgical bond with the substrate is good. The microhardness and wear resistance of the Fe-Al-Si composite coating are about 1.8 times for the Fe-Al composite coating.