Abstract
The paper considers the laser spot heating process in the AISI 316L stainless steel sample and its three-dimensional mathematical model. It proposes an option in this process numerical simulation by introducing a laser radiation source specified as the super Gaussian distribution with refined and experimentally selected dimensionless coefficients. Boundary conditions of convection and radiative heat transfer, as well as the Marangoni convection on the melting pool free surface, were taken into account. Metal phase transition from solid to the liquid aggregation state was realized within the solidus and liquidus temperature ranges due to effective functions of heat capacity and viscosity. Geometrical characteristics of the melt pools obtained during a number of practical experiments were compared with the data determined by numerical solution. It is shown that the results in both the options quantitatively and qualitatively coincide with the insignificant error. Conclusions are made on the error in the numerical solution.
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