Mechanics and energy analysis on molten pool spreading during laser solid forming
Mechanics and energy analysis on molten pool spreading during laser solid forming
复制标题
激光立体成形熔池扩展的力学和能量分析
DOI：
10.1016/j.apsusc.2010.02.060
复制
发表时间：
2010-05-01
影响因子：
6.7
通讯作者：
Huang, Weidong
中科院分区：
文献类型：
--
作者：
Yu, Jun;Lin, Xin;Huang, Weidong
研究了激光立体成形过程中熔池宽度在一定条件下逐渐增大的问题，熔池宽度的增大会在很大程度上降低激光立体成形零件的形状和尺寸精度。采用静力学分析方法，通过计算熔池固-液-气三相点处的界面张力，建立了单熔敷层二维截面模型，定性地说明了在一定的送粉速率下，熔敷层宽度随熔池温度的升高而增大，即熔敷层扩展行为。同时，通过计算保持固液气三相点平衡的最大平衡接触角，发现熔池在非平衡状态下凝固。此外，为了控制熔池温度和减少熔池扩展量，确定了熔池能量和质量输入的最佳匹配，以获得能量输入和沉积效率之间的最佳平衡。(C)2010年爱思唯尔B。V.保留所有权利。
This paper studies the issue that the molten pool width gradually increases under some conditions during laser solid forming (LSF), which can decrease the shape and dimension accuracy of LSFed component to a large extent. By using the statics analysis method and calculating the interfacial tensions at the solid-liquid-gas triple point of molten pool, the proposed two-dimensional (2D) cross-sectional model of single deposition layer illustrates qualitatively that the deposition width would increase with the increasing pool temperature at a certain powder feeding rate, which we called the pool spread behavior here. Meanwhile, by calculating the maximum equilibrium contact angle for keeping solid-liquid-gas triple point balance, it is found that the molten pool is solidified during non-equilibrium state. Furthermore, in order to control the pool temperature and decrease pool spread amount, the optimal match of pool energy and mass inputs is determined for obtaining an optimum balance between the energy input and deposition efficiencies. (C) 2010 Elsevier B. V. All rights reserved.