Surface Rippling Induced by Surface-Tension Gradients During Laser Surface Melting and Alloying

来自 Semantic Scholar

喜欢 0

阅读量：

167

作者：

TR Anthony，HE Cline

展开

摘要：

During laser surface melting and alloying, temperature gradients on the melt surface between the laser‐beam impact point and the intersection line of the solid‐liquid interface with the surface generate surface‐tension gradients that sweep liquid away from beam impact point. The resulting flow of liquid creates a depression of the liquid surface beneath the beam and ridging of the liquid surface elsewhere. As the beam passes to other areas of the surface, this distortion of the liquid surface is frozen in, creating a roughened rippled surface. If the laser‐beam sweep velocity exceeds a critical velocity, the liquid does not have sufficient time to form ripples, and rippling from surface‐tension gradients can be avoided.

展开

关键词：

Theoretical or Mathematical/ alloys laser beam effects melting metals surface tension surface treatment/ laser surface melting alloying large temperature gradients surface tension gradient molten liquids rapid cooling roughened surface surface rippling metals/ A6470D Solid-liquid transitions A6810C Fluid surface energy (surface tension, interface tension, angle of contact, etc.) A7920D Laser-surface impact phenomena A8160B Surface treatment and degradation of metals and alloys