Abstract
Multi-physics phenomena during the process of laser-based metal deposition can be understood a priori using a three-dimensional numerical simulation which translates the melt pool behaviour during the laser substrate interaction. In this work, a macro-scale 3D Finite Element Method based modelling is performed to embrace the complex nature of the melt pool, as a result of laser substrate interaction in the absence of powder flow. The simulation is carried out considering the laser beam moving on a SS316L substrate. The study is intended to determine the melt pool width, depth, cooling rate and hardness. The cooling rate of 9310 K/s and 26,394 K/s are obtained to achieve a corresponding hardness value of 239 and 269 kg/mm2, respectively. The physics-based model is then integrated with the regression model to develop a hybrid model for the prediction of the melt pool characteristics. The hybrid model predicts the melt pool width, depth and hardness of the track with a good correlation of (90.67%, 97.77%), 99.08% and 97.32%, respectively. The part quality, largely depending upon the melt pool shape and characteristics can thus be controlled by using the combined hybrid approach.
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Pant, P., Chatterjee, D. A Multi-Physics Way to Investigate some Aspects of Melt Pool During Laser Substrate Interaction in Laser Metal Deposition Process. Trans Indian Inst Met 74, 2843–2852 (2021). https://doi.org/10.1007/s12666-021-02364-w
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DOI: https://doi.org/10.1007/s12666-021-02364-w