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利用2kW半导体激光器和同轴送粉装置在40Cr表面进行激光熔覆铁基合金,解决易于失效的问题。通过光学显微镜、扫描电镜、X射线衍射仪、显微硬度计和摩擦磨损试验机等对熔覆层的微观形貌、物相、显微硬度和摩擦磨损性能进行分析测试。结果表明,激光熔覆铁基合金的显微硬度提高2倍左右,平均摩擦系数和磨损量分别为基体的44%和35%。激光熔覆层中的晶粒细化和金属间化合物的形成对性能的提高起到重要作用。
The use of 2kW semiconductor laser and coaxial powder feeding device 40Cr laser clad iron-based alloy surface to solve the problem of easy failure. The microstructure, phase, microhardness and friction and wear properties of the coatings were analyzed by optical microscope, scanning electron microscopy, X-ray diffraction, microhardness tester and friction and wear tester. The results show that the microhardness of the laser cladding iron-based alloy increases about 2 times, and the average friction coefficient and wear amount are 44% and 35% of the matrix, respectively. Grain refinement and intermetallic compound formation in the laser cladding layer play an important role in improving the properties.