Comprehensive modeling of transport phenomena in laser hot-wire deposition process
Comprehensive modeling of transport phenomena in laser hot-wire deposition process
复制标题
激光热丝沉积过程中输运现象的综合建模
DOI：
10.1016/j.ijheatmasstransfer.2018.04.164
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发表时间：
2018-10
影响因子：
5.2
通讯作者：
Yiming Rong
中科院分区：
文献类型：
--
作者：
Shaopeng Wei;Gang Wang;Yung C. Shin;Yiming Rong
激光热线沉积过程中熔池和热影响区的输运现象本质上是复杂的。这些现象涉及毫米尺度上的多相流动，包括气液界面的表面张力和毛细效应、固液相变、激光束源的热量输入以及填充线的质量增加。因此，本研究提出了一个全面的多相模型，该模型解释了激光热线沉积过程中气液固界面的演变。采用水平集和流体体积的耦合方法，在保证不违反质量守恒的情况下，以高分辨率跟踪自由表面的运动。在连续方程和能量方程中，将预热填料丝的质量附加作为源项进行建模。模拟结果包括熔池和覆层的几何形状、Marangoni向外流动效应和沉积过程中的温度演变。基于激光传导焊接和激光热丝沉积实验确定的熔合区和熔覆层几何形状，对多相模型进行了验证。基于热影响区各相变区的温度分布，分析了熔覆层形成机理（特别是FV520B马氏体时效钢的显微组织和显微硬度梯度）。
Transport phenomena in the molten pool and heat affected zone during the laser hot-wire deposition process are intrinsically complex. These phenomena involve multi-phase flows on the millimeter scale, including surface tension and capillary effects at the gas–liquid interface, solid–liquid phase transition, heat input from the laser beam source, and mass addition from the filler wire. Thus, a comprehensive multi-phase model was proposed in this study, which elucidates the evolution of the gas–liquid–solid interfaces during the laser hot-wire deposition process. A coupled level-set and volume-of-fluid approach was adopted to track the motion of the free surface with high resolution while ensuring that mass conservation was not violated. The mass addition from the preheated filler wire was modeled as the source terms in the continuity and energy equations. The simulation results include the geometries of the molten pool and clad layer, Marangoni outward flow effect and temperature evolution during the deposition. The multi-phase model was validated based on the geometries of the fusion zone and clad layer determined from laser conduction welding and laser hot-wire deposition experiments. The mechanism of cladding formation (specifically the microstructural and microhardness gradients in the deposited FV520B maraging steel) was analyzed based on the temperature profile of various phase transition regions in the heat affected zone.
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DOI：
10.1088/0022-3727/41/5/055503
发表时间：
2008-03
期刊：
Journal of Physics D: Applied Physics
影响因子：
--
作者：
E. Amara;R. Fabbro
通讯作者：
E. Amara;R. Fabbro
影响因子：
8.4
作者：
B. Russell
通讯作者：
B. Russell
影响因子：
3.2
作者：
Shaoyi Wen;Y. Shin
通讯作者：
Shaoyi Wen;Y. Shin
DOI：
10.1080/10407780290059576
发表时间：
2002-08
期刊：
Numerical Heat Transfer, Part A: Applications
影响因子：
--
作者：
S. Sarkar;P. Raj;S. Chakraborty;P. Dutta
通讯作者：
S. Sarkar;P. Raj;S. Chakraborty;P. Dutta
DOI：
10.1115/1.4023240
发表时间：
2013-02
影响因子：
4
作者：
S. Marimuthu;R. M. Eghlio;A. Pinkerton;Lin Li
通讯作者：
S. Marimuthu;R. M. Eghlio;A. Pinkerton;Lin Li