CC BY
4*
ALT'23 The 30th International Conference on Advanced Laser Technologies
LM-O-17
Application of scaling laws to describe laser cladding of metal-ceramic coatings
A.A. Golyshev
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk
alexgol@itam. nsc. ru
Additive manufacturing (AM) represent one of the fastest growing technologies nowadays [1]. Various methods and materials for additive manufacturing are created every year.
Defining parameters that characterize the physical processes occurring during additive manufacturing allows to control the behavior of the melt pool. It was shown in [2] that by controlling the geometry of the melt pool, one can directly establish the relationship between the specified parameters and the microstructure and, thus, formulate analytical equations that can be used in optimizing the additive manufacturing process. Introducing dimensionless parameters into these equations using the n-theorem simplifies physical models and reveals dependencies between physical quantities. This method has been successfully applied in hydrodynamics, biology, biomechanics [3], nuclear physics [4], and laser technologies [5-6].
Introduction of variable combinations into analytical equations allows, firstly, to reduce the number of parameters that need to be studied when using AT, and secondly, to more accurately determine the processes occurring during AT. [7].
In this work, the direct metal deposition (DMD) method of laser cladding is used. This method involves feeding the deposited powder mixture through a nozzle coaxially to the laser beam.
During the experiments, a powder mixture of titanium alloy Ti64 and silicon carbide (SiC) with different ceramic concentrations of 0%, 10%, and 20% by weight was deposited. Single tracks were formed from the metal-ceramic powder mixture with SiC concentrations of 0%, 10%, and 20% wt. at different laser parameters. It was shown that the geometric dimensions of the tracks, regardless of the ceramic concentration, are determined by two dimensionless parameters - normalized enthalpy B and Peclet number Pe - and can be described by a single dependence. It was demonstrated that the found laws are valid both when depositing onto a metallic substrate and onto a metal-ceramic layer (Ti64 - 10% wt. SiC).
The research was carried out with the support of a grant from the Russian Science Foundation № 21-7910213, https://rscf.ru/proj ect/21-79-10213/.
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