材料科学
微观结构
无定形固体
等轴晶
复合数
激光功率缩放
金属间化合物
体积分数
复合材料
激光器
铝化钛
冶金
光学
结晶学
合金
化学
物理
作者
Luan Zhang,Cunshan Wang,Lijun Han,C. Dong
标识
DOI:10.1016/j.surfin.2016.11.006
摘要
Co-based amorphous composite coatings were produced by laser cladding on the 45# medium steel substrate. The influences of laser power on the microstructure and properties of the coatings were investigated. Results show that the coatings exhibit layered structure, which can be generally divided into three different zones: surface zone consisting of the Co2B equiaxed dendrite dispersed in the amorphous matrix, transition zone containing dendritic/columnar Co2B intermetallic compound plus intergranular Co3B intermetallic compound, and interface bonding zone composed of α'-(Co, Fe) solid solution distributed in the α-(Co, Fe) solid solution. The layered structure results from the dilution and stir influence from the substrate. With the increase of laser power, the volume fraction of the amorphous phase in surface zone significantly increases, with the highest fraction (92%) obtained at laser power of 4.0 kW. As a result, the average hardness of the coatings decreases, while the wear resistance and anti-friction properties increase.
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