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利用6 kW光纤激光器在Q235钢板表面激光熔覆Ni基WC复合涂层。使用光学显微镜、扫描电子显微镜、能谱仪、显微硬度计,研究了不同激光功率下熔覆层组织形态、成分和显微硬度的变化规律。结果表明:WC部分发生溶解并与其他元素相互作用形成共晶物,析出后以块状、条状、粒状等形态存在;随着激光功率的增大,熔覆层的高度、熔深和稀释率逐渐增加,熔覆层平均硬度先增大后减小,当激光功率为2500 W时能够获得最高硬度,可达基体硬度的5倍左右。
Laser cladding Ni-based WC composite coating on Q235 steel surface with 6 kW fiber laser. Using optical microscope, scanning electron microscope, energy dispersive spectrometer and microhardness tester, the variation of microstructure, composition and microhardness of cladding layer under different laser powers were studied. The results show that the WC part dissolves and interacts with other elements to form a eutectic. After being precipitated, the WC particles exist in the form of lumps, stripes and grains. With the increase of the laser power, the height, penetration and dilution of the cladding layer The average hardness of the cladding layer first increases and then decreases. When the laser power is 2500 W, the maximum hardness can be obtained up to about 5 times the hardness of the substrate.