Numerical simulation in the diffraction approximation of laser radiation interaction with a stream of microparticles
P.A. Statsenko1,2, M.N. Khomyakov1,2
1Institute of Laser Physics SB RAS, Novosibirsk, Russia, Novosibirsk, Russia
2Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Keywords: laser cladding, particle flow, energy attenuation, modeling, diffraction approximation
Abstract
In laser cladding, the interaction of laser radiation with the powder flow and the substrate plays a key role. Surface heating depends on the distribution of radiation on the surface of the material, which is determined by the interaction of radiation with the flow of the powder microparticles. Usually, in models for calculating laser beam attenuation, the interaction of radiation with microparticles is limited to a simple geometric consideration based on the ratio of the cross-section area of the particles to the total area of the cross section under consideration, without taking into account the influence of diffraction. Radiation propagation is also considered in еру geometric approximation. The presented model allows taking into account the phenomenon of diffraction on powder microparticles. The results obtained using the model with radiation propagation in the geometric approximation are compared with the model with radiation propagation in the diffraction approximation proposed by the authors. It is shown that the numerical model of radiation attenuation and propagation in the diffraction approximation is applicable for complex analysis of the interaction between a laser beam, a particle stream, and a surface. The model allows estimating the beam attenuation due to interaction with the flow of microparticles and obtaining the intensity distribution on the surface of the substrate.
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