Modelling of remelted and heat affected zone during laser alloying of C45 steel with nickel-based powder Online publication date: Fri, 10-Apr-2015
by Z. Bergant; I. Felde; J. Grum
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 10, No. 2, 2015
Abstract: The aim of the research 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 law. 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 was used to study 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 requires further refinement in order to take into account the complex physical phenomena during laser melting and alloying.
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