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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。
The Fe-Mo-Ni-Si-B coating was prepared on 45 steel by laser cladding and laser remelted. The microstructure of the coating was studied by optical microscope, environmental scanning electron microscope and X-ray diffractometer. The microhardness of the coating before and after remelting was analyzed by Vickers hardness tester, wear tester and electrochemical workstation. , Friction and wear and corrosion resistance. The results show that the Fe-Mo-Ni-Si-B amorphous nanocrystalline composite coating with good metallurgical bonding can be obtained on 45 steel by laser cladding. The cladding consists of a mixture of crystalline and amorphous phases. The major crystalline phases include FeSi, Fe2B, FeNi, Fe3Mo and Fe. After remelting treatment, the cladding layer refinement, the grain is more small, the proportion of amorphous phase increased. The hardness of the cladding layer can reach 1007 HV0.1, while the remelting layer hardness slightly increased to 1076 HV0.1, compared with the matrix, all increased by 5 to 6 times; compared with the substrate, the wear resistance of the cladding And corrosion resistance is improved, in which the remelted layer is more excellent wear resistance and corrosion resistance.