激光作用下合金熔池内的熔体流动

Melt Flow in Alloy Melted Pool Under the Action of Laser

从力学角度研究了激光合金化过程中的熔体流动。研究表明激光合金化熔体的流动受控于熔池表面的表面张力梯度的作用和来自熔池水平方向的温差所致的浮力作用。这两个力的作用区域在合金化熔池中是有差异的。激光合金化的Bond无因次量的分析说明上述两个作用力的强度在同一数量级内,在一定条件下,两者几乎相当。

Melt flow in the course of laser alloying is considered on the basis of mechanics. The findings show that the melt flow in laser alloying pool is mainly controlled by two action forces,i. e. the surface tension force on alloying pool.surface,caused by the temperature difference on the pool surface and the buoyancy force in alloying pool caused by the temperature difference in the horizontal direction in the melt pool. These two forces differ in their acting areas. The analysis of the Bond dimensionless number used for laser alloying shows that the two force actions are in the same order,and almost equal under the certain condition.