Simulation of Laser Alloying Process
The aim of the paper is to develop a simplified numerical model to predict the formation of the melt pool and the heat affected zone in single track laser alloying of C45 steel with NiCrBSi powder. The developed finite element model is based on the temperature field calculation using Fourier equations. The unknown coefficients such as surface absorption coefficient, volumetric efficiency and beam distribution coefficients are set according to cross-section geometry data, obtained from laser alloying experiment. The Nd:YAG solid state laser with multi-jet nozzle laser head with shielding gas argon was used to conduct experimental runs. The full factorial experimental design was used to evaluate the influence of power and scan feed rate on remelted cross-section area and microstructure. The calculated height and depth of melt pool and heat affected zone are in fairly good agreement with the experimental data. The presented numerical model require further refinement in order to take into account the complex physical phenomena during laser melting and alloying.
KeywordsLaser alloying Remelting Simulation Steel NiCrBSi
We acknowledge the financial support of this work by the Hungarian State and the European Union under the TÁMOP-4.2.1. B -11/2/KMR-2011-0001 project.
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