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首页> 外文期刊>International Journal of Heat and Mass Transfer >Modeling of transport phenomena in direct laser deposition of metal matrix composite
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Modeling of transport phenomena in direct laser deposition of metal matrix composite

机译：金属基复合材料直接激光沉积中的传输现象建模

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摘要

Direct laser deposition of metal matrix composite provides a very promising method to fabricate non-homogeneous material in one step directly from CAD drawings. During this process, reinforcing hard particle phase is mixed with the liquid matrix material to change the material property. Despite its usefulness, an understanding of interaction between the reinforcing particle and matrix material in the molten pool still remains as a challenge to determining the final properties of the fabricated composite. In this paper, distinct comprehensive modeling is presented to describe the complex transport phenomena during direct laser deposition of metal matrix composite. The molten pool thermal and fluidic behavior with the inter-phase coupling between particles and matrix material is modeled. To track the particle distribution, a species transport equation for particle mass fraction, as well as algebraic expressions considering possible different phase velocities, is combined with the other deposition governing equations. The mixture properties of composite are obtained by incorporating the volume fraction of each phase. The simulated average particle volume fractions agree with the experimental results and the model can be used to design the properties of the composite synthesised by the laser direct deposition process.
机译：金属基复合材料的直接激光沉积提供了一种非常有前途的方法，可以直接从CAD图纸一步制造非均质材料。在该过程中，将增强的硬质颗粒相与液体基质材料混合以改变材料性能。尽管有用，但对熔池中增强颗粒与基质材料之间相互作用的理解仍然是确定所制造复合材料最终性能的挑战。在本文中，提出了独特的综合模型来描述金属基复合材料直接激光沉积过程中的复杂传输现象。利用颗粒和基质材料之间的相间耦合对熔池的热和流体行为进行建模。为了跟踪粒子分布，将粒子质量分数的物种迁移方程以及考虑可能的不同相速度的代数表达式与其他沉积控制方程相结合。复合材料的混合性能是通过结合各相的体积分数获得的。模拟的平均颗粒体积分数与实验结果吻合，该模型可用于设计通过激光直接沉积工艺合成的复合材料的性能。

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