As one of emerging novel surface treatment techniques, laser polishing offers a cost-effective and efficient solution to reduce surface roughness of precision components at micro-/mesoscale. Although it has been applied for industrial and biomedical purposes, the underlying mechanism has not been fully revealed. This paper presents a study to understand the basic fundamentals of continuous wave fiber laser polishing of Ti6Al4V samples. A two-dimensional numerical model that coupled heat transfer and fluid flow is developed to illustrate the molten flow behavior. The roles of capillary and thermocapillary flow in the process of laser polishing are investigated to assist the understanding of the contributions of surface tension (capillary force) and Marangoni effect (thermocapillary force) in the polishing process. Capillary force dominates the molten pool at the initial stage of melting, while thermocapillary force becomes predominant when the molten pool fully develops.
Role of Capillary and Thermocapillary Forces in Laser Polishing of Metals
Shanghai Jiao Tong University,
Shanghai 200240, China
University of Shanghai for Science
Shanghai 200093, China
Manuscript received June 20, 2016; final manuscript received December 2, 2016; published online January 30, 2017. Assoc. Editor: Hongqiang Chen.
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Zhang, C., Zhou, J., and Shen, H. (January 30, 2017). "Role of Capillary and Thermocapillary Forces in Laser Polishing of Metals." ASME. J. Manuf. Sci. Eng. April 2017; 139(4): 041019. https://doi.org/10.1115/1.4035468
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