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The IUP Journal of Mechanical Engineering
A Comparison of TiCN + Al2O3 + TiN and TiAlN Coated Carbide Tools for Machining of Inconel 718
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Moving heat sources of laser melting are treated with various transformations along with a decoupling for the heat and mass transfer terms. The scale for heat diffusion is different from conduction, and when small intervals of time are involved in rapid solidification, the effect may be pronounced. Very little published work exists on the stability of the solid-liquid interface. It is essential to understand this aspect because instabilities in solidification processes will affect the final finish of the surface. Novel transforms specific to melting with convective surface conditions are applied to this analysis. Phase field theory notions are applied to specific cases for amorphous film formation.

 
 

Most of the literature has dealt with stationary heat sinks and sources in connection with moving boundary problems. The classic work of Carslaw and Jaeger (1959) claims only certain solutions known for certain geometries for moving heat sources. The moving heat source in laser melting is treated with various transformations together with a decoupling for the heat and mass transfer terms. The scale for heat diffusion is different from conduction (Sands, 2011) and when small times are involved as in rapid solidification the effect may be pronounced. Some earlier works on the interface boundary are done by Mullins and Sekerka (1963) and Pedroso and Domoto (1973).

 
 

aser treatment, Surface effects, Boundary conditions, Melting, Moving boundary problem