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首页> 外文期刊>Applied Surface Science >Direct laser manufacturing with coaxial powder injection: Modelling of structure of deposited layers
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Direct laser manufacturing with coaxial powder injection: Modelling of structure of deposited layers

机译：通过同轴粉末注射进行直接激光制造：沉积层结构建模

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摘要

Direct Laser Manufacturing (DLM) with coaxial powder injection is applied for fabrication of near net shape objects from metallic powder. The proposed model includes analysis of the two-phase flow formed by the coaxial nozzle, particles heating by the laser beam, and deposit formation. The experimentally observed deposit looks like a porous array of separate intersecting particles. The density of the deposit is determined by competition between kinetic energy of the liquid droplets at impact and surface tension forces preserving their spherical shape. It is shown that the density, the mean coordination number and the maximum radius of the necks formed between particles increase with the impact velocity. The particles are bound preferentially in the vertical direction. The bounding anisotropy decreases with the impact velocity. The neck size distribution changes from a very narrow one at low velocities to a wide distribution at high velocities. The radial distribution function indicates that short linear chains of particles are formed at low impact velocities, these chains disappearing at higher velocities.
机译：具有同轴粉末注射的直接激光制造（DLM）用于从金属粉末制造近净形状的物体。提出的模型包括分析同轴喷嘴形成的两相流，激光束加热颗粒以及沉积物形成。实验观察到的沉积物看起来像是一个相互交叉的颗粒的多孔阵列。沉积物的密度取决于液滴在撞击时的动能与保持其球形的表面张力之间的竞争关系。结果表明，颗粒之间形成的颈的密度，平均配位数和最大半径随冲击速度而增加。颗粒优选在垂直方向上结合。边界各向异性随着冲击速度而减小。颈部的大小分布从低速时的非常窄的变化到高速时的宽分布。径向分布函数表明，在较低的冲击速度下会形成短的线性直链状颗粒，这些链在较高的速度下会消失。

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