激光强化冲击技术中涂层厚度的理论研究

Theoretic Study on the Thickness of coating in Laser Shocked Processing

在激光冲击强化技术中,充当能量转换体的涂层厚度问题是影响激光冲击强化效果的关键技术之一。许多研究者认为激光冲击强化处理技术中的涂层应有一个最佳值。涂层过厚,剩余涂层会对激光冲击波产生损耗;涂层过薄,又使金属表面产生气化,二者均会影响激光冲击强化效果。本文从激光与涂层相互作用的物理机理,研究推导了激光冲击涂层的理论厚度计算公式,并从工件表面状态、涂层和约束层等相关环境因素出发,讨论了它们对涂层厚度理论计算的影响,得到了具体工况条件下激光冲击涂层厚度的理论估算公式。

It is one of key technology that the coating thickness is as energy conversion matter in the Laser Shocked Proceasing. Most researchers think that the coating thickness should have a optimum value obtained. If the coating thickness is thicker, remaining coating will make the energy of laser shock wave to reduce; if the coating thickness is thinner, which will make the surface of the workpiece to damage. In this paper, the theoretic calculating formula of the coating thickness was obtained through the analysis of the physic mechanism between laser and coating acted each other. Furthermore, we discussed the effect of the theoretic formula for the roughness of the workpiece surface and confinement et al. The corrected calculating formula of coating is obtained in the actual working condition.