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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 three-dimensional transient model is used to simulate the attenuation of a laser beam passing through a converging titanium metal powder cloud near the substrate in a coaxial laser direct metal deposition process. The ray tracing method was used to calculate the light intensity distribution of the laser beam which was absorbed by the powder and partially diffused in all directions. The effects of laser wavelength and number of particles on the laser attenuation process are considered. The results show that the laser absorption rate of titanium powder with a uniform spatial distribution of 0.01g / mL is 5.47%. The attenuation of the laser beam passing through the powder cloud is almost unaffected by the wavelength, but increases with the number of particles. Numerical simulations agree well with experimentally measured particle suspension transmissivity curves at 1.06 μm.