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采用半导体激光器,使用预置粉末的方式在Q235钢表面制备了Ni基WC复合涂层。使用扫描电镜、金相显微镜、显微硬度仪等分析了激光功率对熔覆层的宏观形貌、显微组织和性能的影响。结果表明:随着激光功率的提高,熔覆层的宽度、堆积高度和基底熔深均增大;熔覆过程中WC颗粒与Ni基合金之间发生了原子间的扩散,形成了冶金结合,生成了大量的富W、富Cr的碳化物硬质相,使涂层的硬度得到了很大的提高;随着功率的增大熔覆层的组织变的更加细小致密,形成大量的呈集群生长的树枝晶;熔覆层的显微硬度是基体的3~5倍。
A semiconductor laser was used to prepare a Ni-based WC composite coating on the surface of Q235 steel by using preset powder. The influence of laser power on the macroscopic morphology, microstructure and properties of cladding layer was analyzed by using scanning electron microscopy, optical microscope and microhardness tester. The results show that with the increase of the laser power, the width of the cladding layer, the height of the cladding layer and the penetration depth of the substrate all increase. During the cladding process, interstitial diffusion occurs between the WC particles and the Ni-based alloy to form a metallurgical bond, A large amount of W-rich and Cr-rich carbide hard phases were formed, the hardness of the coating was greatly improved. With the increase of power, the microstructure of the cladding layer became finer and more compact, forming a large number of clusters The growth of dendrites; cladding micro-hardness is 3 to 5 times the matrix.