Abstract
A self-consistent three-dimensional transient model was developed for laser cladding with coaxial powder injection process. Physical phenomena including heat transfer, melting/solidification phase change, mass addition, liquid metal flow, and species transportation were modeled and solved with a controlled-volume finite difference method. Interactions between the laser beam and the coaxial powder flow were also considered in this model, which encompass the attenuation of beam intensity and temperature rise of powder. Level-set method was implemented to track the growth and evolution of liquid free surface precisely during continuous cladding process. The solute concentration distribution in cladding layer was obtained using a nonequilibrium partition coefficient model. Simulation results were compared with experimental observations and found to be reasonably matched.A self-consistent three-dimensional transient model was developed for laser cladding with coaxial powder injection process. Physical phenomena including heat transfer, melting/solidification phase change, mass addition, liquid metal flow, and species transportation were modeled and solved with a controlled-volume finite difference method. Interactions between the laser beam and the coaxial powder flow were also considered in this model, which encompass the attenuation of beam intensity and temperature rise of powder. Level-set method was implemented to track the growth and evolution of liquid free surface precisely during continuous cladding process. The solute concentration distribution in cladding layer was obtained using a nonequilibrium partition coefficient model. Simulation results were compared with experimental observations and found to be reasonably matched.
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