Abstract:
The middle bottom plate of the scraper conveyor's central trough is subjected to high loads and impacts over time, leading to severe wear. To enhance its wear resistance and impact resistance, laser cladding technology was used to fabricate a cladding layer of Fe
3Al/Cr
3C
2 composite material. The effects of Cr
3C
2 content and Ni-based transition layers on the microstructure, wear resistance, and impact resistance of the cladding layer were comparatively studied. The microstructure of the cladding layer was characterizedusing X-ray diffraction (XRD), scanning electron microscopy (SEM), backscattered electron imaging (BSE), and energy dispersive spectroscopy (EDS). The results indicate that the Cr
3C
2 content significantly affects the wear and impact resistance of the Fe
3Al/Cr
3C
2 cladding layer. During wear, the softer Fe
3Al/Fe
2AlCr matrix phase is first worn away, while the harder M
7C
3 phase effectively supports the abrasive surface, thereby resisting wear. Within a certain range, increasing the Cr
3C
2 content raises the proportion of Fe
2AlCr in the Fe
3Al matrix phase, whose superior plasticity enhances the material's toughness and strength. Moreover, pre-depositing a Ni-based transition layer on the substrate before cladding can effectively enhance the bonding strength between the coating and the substrate. These findings have broad application prospects in the surface strengthening of core components in coal mining equipment.