激光加工熔池自由表面形貌的理论研究

报道了激光加工的包含熔池自由表面的准稳态有限元模型。研究表明:Marangoni力和蒸气压力是决定自由表面形貌的内在因素,当熔池温度低于沸点时,前者是主要原因,并且重力方向变化对表面形貌有明显的影响;气流是主要的外在因素,它的分布和大小能明显影响熔池自由表面形貌。

Theoretical studies on free surface morphology of melted pool in laser processing

This paper presented the quasi stationary finite element model to describe the free surface situation of the melted pool by laser processing.It is show that Marangoni force and vapor pressure are two internal factors to influence the deformation of the free surface.When the temperature of the melted pool is lower than boiling point,the first one is the main effect,and the gravity will significantly influence the surface morphology.The main outer factor is the gas flow.The strength and the distribution of the gas flow.The strength and the distribution of the gas flow will too affect the surface morphology obviously.