镍基金属陶瓷激光熔覆层组织及摩擦磨损性能

发布时间：2018-03-23 14:49

本文选题：激光熔覆　切入点：镍基金属陶瓷　出处：《中国石油大学学报(自然科学版)》2015年02期

【摘要】：采用5 k W横流CO2激光器在45钢基体上熔覆自制的镍基金属陶瓷涂层,对熔覆涂层的成型性、物相组成、组织形貌、显微硬度及摩擦磨损性能进行研究。结果表明:激光熔覆层成型良好,组织细密均匀,主要为Ni-Fe固溶体中分布Fe2B,WC,M7C3型及M23C6型碳化物。熔覆层靠近基材的组织为发达树枝晶,中上部为基体组织上分布着大量长条状及少量零散分布的菊花状物质,但上部晶粒分布的方向性减弱,晶粒更加细小致密。熔覆层搭接时,搭接界面存在着生长方向多与结合面相垂直的树枝晶组织过渡区。熔覆层的显微硬度约600 HV0.2,沿搭接方向没有明显波动,其摩擦系数、磨损失重及磨损程度较基体45钢明显降低,耐磨性显著提高。
[Abstract]:A 5kW transverse flow CO2 laser was used to cladding self-made nickel-based cermet coatings on 45 steel substrates. The formability, phase composition and microstructure of the coatings were investigated. The microhardness and friction and wear properties of laser cladding layer were studied. The results showed that the laser cladding layer was well formed, and the microstructure was fine and uniform, mainly Fe _ 2B _ 2O _ W _ C _ (7) C _ (3) and M23C6 type carbides distributed in the Ni-Fe solid solution. The microstructure of the cladding layer near the substrate was developed dendrite. In the middle and upper part of the matrix, a large amount of chrysanthemum is distributed in long stripes and a small amount of scattered chrysanthemum, but the direction of grain distribution in the upper part is weakened, and the grain is finer and denser. When the cladding layer is overlapped, There is a dendritic transition zone in which the growth direction is more perpendicular to the bonding surface. The microhardness of the cladding layer is about 600 HV0.2, and there is no obvious fluctuation along the lap direction. The friction coefficient, wear weight loss and wear degree of the cladding layer are obviously lower than that of the 45 steel matrix. The wear resistance is improved remarkably.
【作者单位】：中国石油大学机电工程学院;天津华赛尔传热设备有限公司;
【基金】：国家自然科学基金项目(51179202) 青岛市科技发展指导计划(KJZD-12-44-jch) 中央高校基本科研业务费专项(13CX02073A)
【分类号】：TG174.4

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