Multiphysics simulation of laser–material interaction during laser powder depositon

This work reports a theoretical and numerical study of the parameters related to the process of laser powder deposition through a lateral nozzle. For this purpose, a 3D quasi-stationary finite element model was developed analytically and implemented numerically. The proposed model estimates the shap...

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Bibliographic Details
Published in:International journal of advanced manufacturing technology 2012-04, Vol.59 (9-12), p.1037-1045
Main Authors: Vásquez, Felipe, Ramos-Grez, Jorge Andres, Walczak, Magdalena
Format: Article
Language:English
Subjects:
CAE) and Design
Chromium
Computational fluid dynamics
Computer simulation
Computer-Aided Engineering (CAD
Deposition
Engineering
Finite element method
Flow-density-speed relationships
Fluid flow
Industrial and Production Engineering
Lasers
Mass flow
Mathematical models
Mechanical Engineering
Media Management
Nozzles
Original Article
Phase transitions
Physical properties
Process controls
Process parameters
Thermal conductivity
Three dimensional models
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Summary:This work reports a theoretical and numerical study of the parameters related to the process of laser powder deposition through a lateral nozzle. For this purpose, a 3D quasi-stationary finite element model was developed analytically and implemented numerically. The proposed model estimates the shape of the melt pool depending on the process parameters including scanning speed, powder mass flow, laser power, and physical properties. Also, phase transformations and physical properties (density, thermal conductivity, and specific heat) vary as function of temperature. In addition, thermo-capillary forces and their effect on fluid flow inside the melt pool are considered. The obtained set of equations coupled through the temperature variable was solved using COMSOL Multiphysics. The results are presented and compared with previously obtained experimental data, in which chromium powder was deposited, allowing validation of the model. Finally, variations at the melt pool geometry in terms of the operational parameters are analyzed. This model aims at estimation of melt pool geometry during laser powder deposition in time reasonably short to allow for predictable process control.
ISSN:0268-3768
1433-3015
DOI:10.1007/s00170-011-3571-4