Simulation and experimental analysis of ultrasonic assisted laser cladding Ni60 alloy coating on die steel

The Ni-base alloy coating was prepared on H13 steel by ultrasonic assisted laser cladding technology. The analysis model was established by COMSOL simulation software to explore the influence of ultrasonic frequency on the temperature and temperature gradient of the cladding layer, and the influence of ultrasonic frequency on the macroscopic morphology and microstructure was explored through experiments. The results show that the temperature of the cladding layer increases with the increase of ultrasonic frequency, while the temperature difference decreases first and then increases. With the increase of ultrasonic frequency, the longitudinal temperature along the cladding plane increases, and the temperature difference increases first and then decreases. The temperature gradient of cladding layer with ultrasonic application is smaller than that without ultrasonic application, and the temperature gradient decreases with the increase of ultrasonic frequency. With the increase of ultrasonic frequency, the dilution rate increases, and the cladding width and depth increase. The higher the ultrasonic frequency, the better the grain separation and refinement; Ultrasonic promotes element diffusion between cladding layer and matrix and improves element segregation.