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首页> 外文期刊>Journal of engineering materials and technology >A Comparison of the Thermo-Fluid Properties of Ti-6AI-4V Melt Pools Formed by Laser and Electron-Beam Powder-Bed Fusion Processes
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A Comparison of the Thermo-Fluid Properties of Ti-6AI-4V Melt Pools Formed by Laser and Electron-Beam Powder-Bed Fusion Processes

机译：通过激光和电子束粉床融合工艺形成的Ti-6ai-4V熔池热流体性能的比较

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摘要

Powder-bed fusion (PBF) process is a subdivision of additive manufacturing (AM) technology where a heat source at a controlled speed selectively fuses regions of a powder-bed material to form three-dimensional (3D) parts in a layer-by-layer fashion. Two of the most commercialized and powerful PBF methods for fabricating full-density metallic parts are the laser PBF (L-PBF) and electron beam PBF (E-PBF) processes. In this study, a multiphysics-based 3D numerical model is developed to compare the thermo-fluid properties of Ti-6Al-4V melt pools formed by the L-PBF and E-PBF processes. The temperature-dependent properties of Ti-6Al-4V alloy and the parameters for the laser and electron beams are incorporated in the model as the user-defined functions (UDFs). The melt-pool geometry and its thermo-fluid behavior are investigated using the finite volume (FV) method, and results for the variations of temperature, thermo-physical properties, velocity, geometry of the melt pool, and cooling rate in the two processes are compared under similar irradiation conditions. For an irradiance level of 26 J/mm~3 and a beam interaction time of 1.212 ms, simulation results show that the L-PBF process gives a faster cooling rate (1. 5 K/μs) than that in the E-PBF process (0.74 K/μs). The magnitude of liquid velocity in the melt pool is also higher in L-PBF than that in E-PBF. The numerical model is validated by comparing the simulation results for the melt-pool geometry with the PBF experimental results and comparing the numerical melt-front position with the analytical solution for the classical Stephan problem of melting of a phase-change material (PCM).
机译：粉床融合（PBF）工艺是一种添加剂制造（AM）技术的细分，其中受控速度的热源选择性地熔化粉末床材料的区域，以在层中形成三维（3D）部分 - 层时尚。用于制造全密度金属部件的最多商业化和强大的PBF方法是激光PBF（L-PBF）和电子束PBF（E-PBF）工艺。在该研究中，开发了一种基于多体的3D数值模型，以比较由L-PBF和E-PBF方法形成的Ti-6Al-4V熔体池的热流体性质。 Ti-6AL-4V合金的温度依赖性和激光器和电子束的参数作为用户定义的功能（UDF）结合在模型中。使用有限体积（Fv）方法研究熔融池几何形状及其热流体行为，并导致熔池的温度，热物理性质，速度，几何形状的变化以及两种过程中的冷却速度在类似的照射条件下进行比较。对于26J / mm〜3的辐照度水平和1.212ms的光束相互作用时间，仿真结果表明，L-PBF过程比E-PBF过程中的冷却速率更快（1.5 k /μs） （0.74 k /μs）。 L-PBF的熔池中液体速度的大小比E-PBF中的液体速度也高。通过将熔融池几何形状的模拟结果与PBF实验结果进行比较，并将数值熔体正面位置与分析解决方案的分析解决方案进行比较，验证了数值模型，以进行相变材料熔化的经典斯蒂芬问题。

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