Abstract
The microstructure of a clad layer produced via selective laser cladding with coaxial metal powder injection is studied numerically. The Johnson–Mehl–Avrami–Kolmogorov equation for condensed systems with inhomogeneous rates of nucleation is used to model the phase change kinetics. The impact of the substrate boundary along with interconnected heat transfer and phase change processes on the final microstructure of a built-up layer is demonstrated. The qualitative difference between the behavior of the temperature on the built-up layer’s surface and at the depth of the substrate is established, revealing the inhomogeneous microstructure of the final layer.
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Original Russian Text © M.D. Khomenko, V.Ya. Panchenko, V.G. Niziev, F.Kh. Mirzade, R.V. Grishaev, 2016, published in Izvestiya Rossiiskoi Akademii Nauk. Seriya Fizicheskaya, 2016, Vol. 80, No. 4, pp. 422–427.
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Khomenko, M.D., Panchenko, V.Y., Niziev, V.G. et al. Numerical investigation of the microstructure of a clad layer produced via laser cladding with coaxial metal powder injection. Bull. Russ. Acad. Sci. Phys. 80, 381–386 (2016). https://doi.org/10.3103/S1062873816040201
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DOI: https://doi.org/10.3103/S1062873816040201