Numerical simulation of phase transition process of laser drilling on GH4037 nickel-based superalloy

In order to study the phase transformation process of laser drilling more accurately, based on the theories of fluid heat transfer and fluid mechanics, a phase transition model of laser drilling on GH4037 nickel-based superalloy was established. In the model, the effect of gravity, viscous force, recoil pressure, solid-liquid phase transition and liquid-gas phase transition process were considered, and the temperature field and velocity field of laser drilling phase transition process were obtained by numerical calculation. The results show that, the reaction pressure of the gasification material can accelerate the flow of the molten pool. When the laser power is 2000W and the pulse width is 1.70ms, the maximum evaporation rate of the material can reach 250m/s. This model provides a theoretical basis for further research on laser drilling.