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0.01g/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1.06μm处的粒子悬浮液透射率曲线相吻合。
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 aster 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 1.06μm fits the transmittance curve of particulate suspension.
出处
《激光与光电子学进展》
CSCD
北大核心
2016年第8期209-217,共9页
Laser & Optoelectronics Progress
基金
北京市自然科学基金重点研究专题(Z140002)
北京市委科技任务(Z141100002814011)
关键词
激光技术
激光直接金属沉积
三维瞬态模型
激光与粉末相互作用
射线追踪
悬浮液
laser technique
laser direct metal deposition
three-dimensional transient model
laser-powderinteraction
ray tracing
suspension
