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Numerical simulation of selective laser melting temperature conduction behavior of H13 steel in different models
摘要： With considering the latent heat of melting and the temperature-dependent thermo-physical properties, a Gauss body heat source is employed to analyze the temperature field and the morphology of molten pool with a single-track and multi-track scan strategy in Substrate-Powder (SP) model, Full-Powder (FP) model and Partial-Solid model (PS), respectively. It is shown that the maximum temperature (Tmax) and maximum cooling rate (vcmax) of single-track increase with preheating temperature, while the maximum heating rate (vhmax) presenting an opposite trend. The preheating temperature has the greatest influence on the length and depth of the molten pool of SP model and the width of FP model. For the reason of heat accumulation, the Tmax of each track increases with the decrease of solid volume in the model and increases with the number of scan tracks in a multi-track scan strategy. Due to prominent thermal conductivity of SP model, heat accumulation of multi-track scanning has the smallest effect on the size of pool, but it drives the molten pool length of PS model and FP model increasing seriously. The verification experiment of SP model was in good agreement with the simulation results, proved that numerical simulation is capable of predicting the temperature field and molten pool morphology during the SLM process.
关键词： numerical simulation,H13 steel,temperature field,molten pool morphology,selective laser melting
更新于2025-09-16 10:30:52
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Influence of surface tension on the molten pool morphology in laser melting
摘要： The surface tension plays an important role in the distribution and evolution of molten pool morphology during laser melting. In this paper, based on the theory of Smoothed Particles Hydrodynamics (SPH), a mathematical model of surface tension on the molten pool morphology is established with the temperature change of molten pool being taken into account. The longitudinal morphology of molten pool and its formation process are simulated by using the SPH method under certain processing parameters, and the distributions of length and depth of molten pool are thoroughly analyzed at various processing parameters. The result shows that the longitudinal morphology of molten pool varying along the longitudinal section of solidified track presents a curve due to the influence of surface tension. A strong influence of Marangoni force on the flow of liquid metal and transformation of heat is also found. Moreover, the longitudinal morphology of a molten pool looks like that of a wave in the simulation; the deformation distributions of the longitudinal morphology of molten pool will increase with increasing laser power or decreasing scanning speed. The longitudinal morphologies of solidified molten pool are observed in the current experiments, and the experimental results are found to be agreed well with the calculated ones.
关键词： Processing parameters,Laser melting,Smoothed particles hydrodynamics (SPH),Molten pool morphology,Surface tension
更新于2025-09-16 10:30:52