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采用等离子熔覆技术在高锰钢表面原位反应制备了低碳Fe–Cr–Ni合金涂层。利用金相显微镜、扫描电镜和X射线衍射仪分析了熔覆层和热影响区的显微组织、形貌以及相组成,讨论了它们的形成机制,并用摩擦试验机测试了涂层和基体的耐磨性。结果表明,制得的Fe–Cr–Ni合金涂层无裂纹,与基体表现为冶金结合,由γ(Fe–Cr–Ni固溶体)相与M7C3等碳化物组成。根据γ相形貌,熔覆层组织由上到下依次为等轴晶、树枝晶、胞状晶和平面晶。热影响区组织为魏氏体。基体为奥氏体和少量珠光体组织。Fe–Cr–Ni合金涂层的显微硬度最高为723 HV,约为基体的3倍。涂层的磨损量远小于基体的磨损量,Fe–Cr–Ni合金涂层可显著改善高锰钢的硬度和耐磨性。
Low-carbon Fe-Cr-Ni alloy coatings were prepared by in-situ reaction on the surface of high manganese steel by plasma cladding. The microstructure, morphology and phase composition of the coating and the HAZ were analyzed by means of metallographic microscope, scanning electron microscopy and X-ray diffractometry. Their formation mechanism was discussed. The tribological properties of the coating and matrix Wear resistance. The results show that the obtained Fe-Cr-Ni alloy coating has no cracks and exhibits metallurgical bonding with the matrix, and is composed of γ (Fe-Cr-Ni solid solution) phase and M7C3 carbides. According to the morphology of γ phase, the microstructure of cladding layer is equiaxed, dendritic, cellular and plane crystal from top to bottom. Heat affected zone organization Wei Wei body. The matrix is austenite and a small amount of pearlite. The microhardness of Fe-Cr-Ni alloy coating is up to 723 HV, which is about 3 times of the matrix. Coating wear is much less than the substrate wear, Fe-Cr-Ni alloy coating can significantly improve the high manganese steel hardness and wear resistance.