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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Molten pool behaviour and its physical mechanism during selective laser melting of TiC/AlSi10Mg nanocomposites: simulation and experiments
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Molten pool behaviour and its physical mechanism during selective laser melting of TiC/AlSi10Mg nanocomposites: simulation and experiments

机译：TiC / AlSi10Mg纳米复合材料选择性激光熔化过程中熔池行为及其物理机制：模拟与实验

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摘要

Simulation of temperature evolution and thermal behaviour of the molten pool during selective laser melting (SLM) of TiC/AlSi10Mg nanocomposites was performed, using a finite volume method. Some important physical phenomena, such as a transition from powder to solid, nonlinearities produced by temperature-dependent material properties and fluid flow, were taken into account in the calculation. The effects of Marangoni convection and SLM processing parameters, such as laser power and scan speed, on temperature evolution behaviour, molten pool dimensions and liquid lifetime were thoroughly investigated. The simulation results showed that Marangoni convection played a crucial role in intensifying the convective heat transfer and changing the molten pool geometry. The temperature of laser-powder interaction zone, the molten pool dimensions and liquid lifetime increased with increasing laser power or decreasing scan speed. The maximum temperature gradient within the molten pool increased significantly with increasing the applied laser power, but increased slightly as a higher scan speed was applied. The experimental study on the interlayer bonding and densification behaviour and the surface morphologies and balling effect of the SLM-processed TiC/AlSi10Mg nanocomposites parts was performed. The experimental results validated the thermal behaviour and underlying physical mechanism of the molten pool obtained in the simulations.
机译：使用有限体积法对TiC / AlSi10Mg纳米复合材料进行选择性激光熔化（SLM）期间的温度变化和熔池的热行为进行了模拟。计算中考虑了一些重要的物理现象，例如从粉末到固体的转变，由温度依赖的材料特性和流体流动产生的非线性。彻底研究了Marangoni对流和SLM工艺参数（如激光功率和扫描速度）对温度变化行为，熔池尺寸和液体寿命的影响。仿真结果表明，Marangoni对流在加强对流换热和改变熔池几何形状方面起着至关重要的作用。激光-粉末相互作用区的温度，熔池尺寸和液体寿命随着激光功率的增加或扫描速度的降低而增加。熔池内的最大温度梯度随所施加的激光功率的增加而显着增加，但随着施加更高的扫描速度而略有增加。进行了由SLM处理的TiC / AlSi10Mg纳米复合材料零件的层间键合和致密化行为以及表面形貌和球形效应的实验研究。实验结果验证了在模拟中获得的熔池的热行为和潜在的物理机理。

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