Modeling of transport phenomena during the coaxial laser direct deposition process
Modeling of transport phenomena during the coaxial laser direct deposition process
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DOI：
10.1063/1.3474655
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发表时间：
2010-08
影响因子：
3.2
通讯作者：
Shaoyi Wen;Y. Shin
中科院分区：
文献类型：
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作者：
Shaoyi Wen;Y. Shin
激光直接沉积被广泛用于直接从计算机辅助设计图纸快速自由成形制造具有良好冶金性能的完全致密部件。由于涉及到复杂的物理过程，如激光粉末相互作用、激光基体相互作用、轨迹界面演化和熔体-固体相互作用，因此开发仿真模型以更好地理解过程中的特性和机制，从而使激光直接沉积过程的优化和控制成为可能是非常重要的。针对同轴激光直接沉积过程，提出了一种新的综合三维自洽瞬态模型，该模型考虑了激光粒子相互作用、质量添加、传热、流体流动、熔化和凝固等物理行为。建立了连续介质模型来处理计算域中的不同相（气体、液体、固体和糊状区）。提出了一种改进的水平集方法，该方法在隐式的同时具有保守的形式。
Laser direct deposition is widely used for rapid freeform fabrication of fully dense components with good metallurgical properties directly from computer-aided design drawings. Because of complex physics involved such as laser powder interaction, laser substrate interaction, track interface evolution, and melt-solid interaction, it is important to develop simulation models to better understand the characteristics and mechanisms in the process so that optimization and control of a laser direct deposition process are possible. In this paper, a new comprehensive three-dimensional self-consistent transient model is presented for a coaxial laser direct deposition process, which considers physical behaviors such as laser particle interaction, mass addition, heat transfer, fluid flow, melting, and solidification. A continuum model is built to deal with different phases (gas, liquid, solid, and mushy zone) in the calculation domain. An improved level-set method, which takes the conservative form while being impli...