Influence of energy fluence and overlapping rate of femtosecond laser on surface roughness of Ti-6Al-4V

Yong Yang,Weiwei Cao,Wenhui Fan,Jinhai Si,Jing Bai,Xu Chen,Guanghua Cheng,Rui Lou

doi:10.1117/1.oe.58.10.106107

Abstract

The Ti-6Al-4V polished by femtosecond laser processing is first investigated. The surface nanoparticles of Ti-6Al-4V induced by femtosecond laser have been characterized by scanning electron microscopy and energy dispersive spectrometry, and the influence of laser fluence and the overlapping rate of laser beam on surface roughness have also been analyzed. Moreover, the relationship between the laser parameters and the surface roughness of Ti-6Al-4V has been revealed, and the fine surface roughness of Ti-6Al-4V is obtained based on the optimized femtosecond laser processing parameters.

Highlights

Ti-6Al-4V, called TC4, is an alpha–beta titanium alloy with high specific strength, low weight ratio, and excellent corrosion resistance, having wide applications in the biomechanical and aerospace industries.[1]
The results showed that the surface roughness of TC4 varied with the energy density and overlapping rate of the femtosecond laser
Triangular points on the solid line indicate the variation of surface roughness, and rectangular points on the dashed line represent the mean diameter of the nanoparticles on the TC4 surface

Summary

Introduction

Ti-6Al-4V, called TC4, is an alpha–beta titanium alloy with high specific strength, low weight ratio, and excellent corrosion resistance, having wide applications in the biomechanical and aerospace industries.[1]. Pfefferkorn et al.[6] performed two-pass polishing using a microsecond laser to improve the TC4 surface finish, where a surface roughness ranging from 172 to 86 nm was achieved in the first pass and was further improved to 47 nm in the second pass. Ma et al.[7] polished TC4 components using a nanosecond fiber laser, and the surface roughness achieved was ∼1 μm. Bhaduri et al.[8] determined that for TC4 polishing using nanosecond and millisecond lasers in air, it is very difficult to eliminate the recast layer and microcrack, which originate from the surface and thermal effects owing to the long-pulse laser polishing

Methods

Results

Conclusion