激光熔覆制备Fe-Mo-Ni-Si-B非晶纳米晶复合涂层的性能

Properties of Fe-Mo-Ni-Si-B amorphous nanocrystalline composite coating fabricated by laser cladding

利用激光熔覆技术在45钢上制备Fe-Mo-Ni-Si-B涂层,并进行激光重熔处理。借助光学光学显微镜、环境扫描电子显微镜、X射线衍射仪对涂层的组织结构进行研究,并利用维氏硬度计、磨损试验机、电化学工作站等设备分析了重熔前后涂层的显微硬度、摩擦磨损及耐腐蚀性能。结果表明：利用激光熔覆技术能够在45钢上获得冶金结合良好的Fe-Mo-Ni-Si-B非晶纳米晶复合涂层。熔覆层由晶体相和非晶相混合组成,主要的晶体相包括Fe Si、Fe2B、Fe Ni、Fe3Mo及Fe单质。经过重熔处理后,熔覆层组织细化,晶粒更为细小,非晶相比例提高。熔覆层的硬度可达到1007 HV0.1,而重熔层硬度略提高到1076 HV0.1,与基体相比,都提高了5~6倍;与基体相比,熔覆层的耐磨性和耐蚀性得以提高,其中重熔层更是表现出优异的耐磨性和耐蚀性。

Fe-Mo-Ni-Si-B coatings were prepared on 45 steel substrate by using the laser cladding and remelting technology. The microstructure and composition of the coatings were analyzed by means of optical metallographic microscope,environmental scanning electron microscope and X-ray diffractometer. The hardness of the coatings was tested by using Vickers hardness tester. The wear properties and corrosion resistance of the coatings were tested by using wear testing machine and electrochemical workstation. The results show that amorphous nanocrystalline composite coatings are well combined with the substrate by using laser cladding and remelting. The laser cladding layer is composed of mixed crystal phase and amorphous phase. The main crystal phases are Fe Si,Fe2 B,Fe Ni,Fe3 Mo and Fe elemental. After the remelting process,the microstructure and the grains of the cladding layer are both refined. The proportion of the amorphous phase can increase. The hardness of the cladding layer is 1007 HV0. 1 while the hardness of the remelting layer is 1067HV0. 1,both 5-6 times higher compared with the substrate. The wear resistance and corrosion resistance of the cladding layer are improved,and the remelting layer shows the best abrasion resistance and corrosion resistance.