Mathematical modeling of heating of a dimetallic plate by a high-energy concentrated radiation flux

Mikhail Purin,Ekaterina Zakharova,G.V Kuznetsov,D Feoktistov,E Bulba

doi:10.1051/matecconf/201819401046

Abstract

Mathematical modeling of heat transfer processes proceeding together under conditions of intense phase transformations (melting and evaporation of metals) under laser action on a dimetallic target has been carried out. Based on the results of numerical simulation, it is established that the laser power exerts a significant influence on the dynamics of the melting process. It is shown that evaporation of metal in the boundary layer of the plate can also have a significant effect on the heat transfer characteristics. It is established that metal vapors forming a gas mixture in the near-wall region can absorb laser radiation and cause the phenomenon of optical resonance with increasing their critical concentration, in other words, when the metal melts, optical breakdown is possible.

Highlights

Laser treatment of metals in industry is becoming increasingly important due to its advantages such as high processing accuracy, the absence of mechanical damage on the processed products, and as a result, a lower consumption of metal for tolerances and allowances of blanks, as well as the ability to work with complex geometric shapes [1,2]
With increasing intensity of the incident radiation, the concentration of metal vapor in the gas region increases to a critical value, and begins to decrease
It is established that the laser power exerts a significant influence on the dynamics of the melting process

Summary

Introduction

Laser treatment of metals in industry is becoming increasingly important due to its advantages such as high processing accuracy, the absence of mechanical damage on the processed products, and as a result, a lower consumption of metal for tolerances and allowances of blanks, as well as the ability to work with complex geometric shapes [1,2]. It should be noted that industrial laser metal processing plants are less harmful for the environment, since they do not generate waste industrial oils that are used to cool and lubricate moving parts of mechanical metalworking machines. In connection with the growing interest in laser processing of metal, studies of the processes that occur during laser processing become topical, field experiments are quite complex and expensive. In these cases, the most suitable is the apparatus of mathematical modeling, which makes it possible to carry out studies of the processes under consideration with high accuracy and efficiency without any material costs. In the plate structure it is possible to form an essentially nonlinear and spatially-distributed fusion front, the shape of which does not yield to polynomial approximation

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Conclusion