125 / 2024-11-02 00:44:24

Effect of laser power on cracking behavior of TiC/Fe-based cladding coatings

High-speed laser cladding, TiC/Fe-based cladding coating, Laser power, Crack

 TiC/Fe-based cladding coatings were successfully prepared by high-speed laser cladding technology through the modulation of laser power. The macroscopic and microscopic structures of the coatings were analyzed by nondestructive testing, optical microscopy (OM) and scanning electron microscopy (SEM). The temperature and stress fields of the coatings were also analyzed by finite element simulation. The results showed that the crack sensitivity of the cladding coatings decreased with the increase of laser power. When the laser power was increased from 2.4KW to 3.6KW, the maximum temperature of the molten pool increased from 3162K to 4203K, and the temperature gradient showed an increasing trend. Although, the residual stress of the coating increased with the increase of laser power, the higher laser power eased the cooling rate of the melt pool, which would promote the growth of TiC ceramic particles and make them uniformly distributed in the melt pool, and thus reduce the crack sensitivity.