激光与光电子学进展, 2016, 53 (8): 081407, 网络出版: 2016-08-11  

激光直接金属沉积中激光束衰减的模拟研究

Numerical Simulation of Laser Attenuation in Laser Direct Metal Deposition
张冬云 1,2,*张晖峰 1,2董东东 1,2刘臻 1,2
作者单位
1 北京工业大学激光工程研究院, 北京 100124
2 北京市数字化医疗3D打印工程技术中心, 北京 100124
摘要
采用三维瞬态模型模拟了同轴激光直接金属沉积过程中激光束在基材附近穿过汇聚的钛金属粉末云时的衰减。采用射线追踪方法,计算了激光束受粉末影响部分被吸收、部分被散射后在各个方向的光强分布。考虑了激光波长和粒子数对激光衰减过程的影响。结果表明,具有均匀空间分布的0.01 g/mL钛粉末云对激光的吸收率为5.47%,激光束穿过粉末云时的衰减几乎不受波长影响,但随粒子数的增加而增强。数值模拟解与实验测得的1.06 μm处的粒子悬浮液透射率曲线相吻合。
Abstract
A comprehensive three-dimensional transient model is developed to analyze laser attenuation near substrate where the beam transmits through the converged titanium powder cloud. A ray tracing method is employed to calculate the intensity distribution in all the directions after the laser beam is partially absorbed and partially scattered by the powder cloud. The effect of laser wavelength and number of particles on the laser attenuation process is considered. The results show that the spatially uniformly distributed titanium powder cloud with a concentration of 0.01 g/mL exhibits an absorptivity of 5.47%. The laser attenuation process due to the powder cloud is barely influenced by wavelength and the attenuation increases as the number of particles increases. The simulated transmittance of power cloud at 1.06 μm fits the transmittance curve of particulate suspension.

张冬云, 张晖峰, 董东东, 刘臻. 激光直接金属沉积中激光束衰减的模拟研究[J]. 激光与光电子学进展, 2016, 53(8): 081407. Zhang Dongyun, Zhang Huifeng, Dong Dongdong, Liu Zhen. Numerical Simulation of Laser Attenuation in Laser Direct Metal Deposition[J]. Laser & Optoelectronics Progress, 2016, 53(8): 081407.

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