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利用大功率激光在1Cr18Ni9Ti表面熔覆NiCrBSi涂层,采用SEM、EDS和MM2000磨损试验机研究了不同激光功率下熔覆层的显微组织、成分及磨损特性。结果表明,熔覆层由熔覆区和结合区两部分组成,熔覆区主要有γ-(Ni,Fe)、CrB等多种相结构,呈现出树枝晶、不规则颗粒状、针状及共晶形式等多种形貌。结合区为细小柱状晶,激光功率增大,稀释率增大。熔覆层的磨损为磨粒磨损和粘着磨损共同作用的结果,磨损率分布在(2.2～2.6)×10~(-5)mm~3/m.N之间,平均摩擦系数为0.52。激光功率增加,耐磨性下降。EDS分析表明主要元素Ni、Fe、Cr、Si在熔覆层中均匀分布。高功率激光熔覆层中,Fe含量所占比重明显增加。
The NiCrBSi coating was deposited on the 1Cr18Ni9Ti surface by high-power laser. The microstructure, composition and wear characteristics of the cladding layer under different laser powers were studied by SEM, EDS and MM2000 wear tester. The results show that the cladding layer consists of two parts, cladding zone and bonding zone. The cladding zone mainly consists of γ- (Ni, Fe), CrB and other phases with dendrites, irregular grains, acicular and Eutectic form and other forms. The binding zone is a small columnar crystal, the laser power increases, the dilution rate increases. The wear of the coating is the result of abrasive wear and adhesive wear. The wear rate is distributed between (2.2 ~ 2.6) × 10 ~ (-5) mm ~ 3 / m.N and the average friction coefficient is 0.52. Laser power increases, wear resistance decreases. EDS analysis showed that the main elements Ni, Fe, Cr and Si were uniformly distributed in the cladding layer. High-power laser cladding layer, the proportion of Fe content increased significantly.