Hybrid analytical-numerical solution model for laser surface processing and its application in texturing of roll surface

摘要

Laser processing of material surface is a rapid and non-equilibrium process. Under the action of laser beam, the material surface melts and solidifies very quickly, and there exists very high thermal gradient. Accordingly, the topography, micro structure and performance of material surface will all change. To analyze these phenomena, the heat transfer and the fluid flow issues during laser surface processing need to be studied in-depth. In this paper, a hybrid analytical-numerical solution model is developed for the heat transfer and fluid flow during laser surface processing. Taking the laser texturing of GCr15 roll surface as example, the model is solved through the surface tension model developed for the melt formed in laser texturing and the numerical results from finite element analysis on the temperature field during laser texturing of roll surface. The laser textured roll surface roughness profile is then theoretically predicted using the solution to the hybrid model. The roll surface topography obtained experimentally agrees very well with the theoretical prediction, which proves the validity of the analytical-numerical solution model.