Thermal evolution behavior and fluid dynamics during laser additive manufacturing of Al-based nanocomposites: Underlying role of reinforcement weight fraction

摘要: In this study, a three-dimensional transient computational fluid dynamics model was established to investigate the influence of reinforcement weight fraction on thermal evolution behavior and during selective laser melting (SLM) additive manufacturing TiC/AlSi10Mg nanocomposites. The powder-to-solid transition nonlinear variation physical properties as-used materials were considered in numerical model, using Gaussian distributed volumetric heat source. simulation results showed that increase operating temperature resultant formation larger melt pool caused by reinforcement. Marangoni convection intensified content, accelerating coupled motion solid particles. circular flows appeared when TiC content reached 5.0 wt. % larger-sized present as increased 7.5 wt. %. experimental study surface morphologies microstructures polished sections SLM-processed nanocomposite parts performed. A considerably dense smooth free any balling effect pore obtained optimized at 5.0 wt. %, due sufficient liquid moderate flow. Novel ring-structured reinforcing particulates tailored because combined action attractive centripetal force repulsive force, which consistent with results.