Study on Microstructure and Performance of Interface between TiC Steel Bonded Carbide and Surfacing Transition Layer
The transition layer was deposited on TiC steel-bonded cemented carbide by using ERNiCrMo-3 welding wire.The microstructures and properties of interface between TiC steel bonded cemented carbide and ERNiCrMo-3 surfacing layer under different heat inputs were studied by using scanning electron microscopy,EDS spectrometer,microhardness tester and universal testing machine.The results show that there is a fusion zone with a thickness of 60-150 μm between TiC steel-bonded cemented carbide and ERNiCrMo-3 surfacing metal.With the increase of welding heat input,the thickness of the fusion zone gradually increases.When the heat input is 3.5 kJ/cm,the microstructure of the interface is uniform,without pores,cracks and abnormal grain growth phenomenon.There is element diffusion between the base metal and the surfacing weld,and the metallurgical bonding is realized.There is a buffer zone with gradually varying hardness change between the base metal and the surfacing weld.The highest shear strength of TiC steel bonded cemented carbide/ERNiCrMo-3 interface can reach 443 MPa,which meets the bonding performance requirement between wear-resistant parts and matrix under harsh conditions.
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