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采用光学显微镜、X射线衍射仪、扫描电子显微镜、能谱分析等手段对镍基合金+WC熔覆粉末颗粒的颗粒种类、颗粒粒径、不同种类颗粒的分布及镍基合金+WC激光熔覆层内各种组织的不均匀分布进行了研究。根据热平衡原理建立了熔覆材料颗粒半径、激光束功率密度和熔覆材料颗粒加热温度之间的定量关系式,提出通过控制各种熔覆材料颗粒大小来实现设计与控制送粉激光熔覆层的显微组织,并以WC与N i基自熔合金混合粉料为熔覆材料,对获得的熔覆层的显微组织进行分析,证明了所提出的熔覆层显微组织的设计与控制方法的可行性与实用性。
The particle types, particle size, distribution of different kinds of particles and the Ni-based alloy + WC laser cladding were studied by optical microscopy, X-ray diffraction, scanning electron microscopy and energy spectrum analysis. Inhomogeneous distribution of various tissues in the layer was studied. Based on the principle of thermal equilibrium, the relationship between the radius of cladding material, the power density of laser beam and the heating temperature of the cladding material particles was established. It is proposed that the design and control of powder cladding laser cladding layer , And the microstructure of the obtained cladding layer was analyzed by using WC and Ni self-fluxing alloy powder as the cladding material. It was proved that the proposed cladding layer microstructure design and Feasibility and practicability of control methods.