研究目的
Investigating the effects of laser power, laser pulse repetition rate and scan speed on the polished metal surface and subsurface characteristics of Ti6Al4V titanium alloy.
研究成果
The laser polishing process can improve the surface roughness of Ti6Al4V titanium alloy by up to 43% with a laser fluence of 1-3 J/cm2. The initial surface roughness significantly affects the final surface quality, with smoother initial surfaces requiring less energy density. High heat input conditions lead to thick recast layers, high oxidation, and large heat-affected zones with micro-cracks. Optimal polishing conditions can achieve smooth surfaces with minimal subsurface damage.
研究不足
The study was conducted in ambient air without assist gas, which may affect the oxidation level of the polished surface. The range of initial surface roughness was limited to 5-15 μm, and the effects of multiple scanning passes were not explored.
1：Experimental Design and Method Selection:
A nanosecond pulse laser (IPG YLP-V2-1-100) was used to polish Ti6Al4V titanium alloy surfaces with different initial roughness levels prepared by shot peening. The laser polishing was performed in ambient air without assist gas.
2：Sample Selection and Data Sources:
Ti6Al4V titanium alloy samples with initial areal surface roughness (Sa) of 5, 10, and 15 μm were used.
3：List of Experimental Equipment and Materials:
IPG YLP-V2-1-100 nanosecond pulse laser, Ti6Al4V titanium alloy samples, 3D laser confocal scanning microscope (Olympus LEXT OLS4000), energy dispersive spectroscopy (EDS).
4：Experimental Procedures and Operational Workflow:
The laser beam was scanned over the metal surface with a 95% overlap between consecutive tracks. The effects of laser power, pulse repetition rate, and scan speed on surface and subsurface characteristics were examined.
5：Data Analysis Methods:
The areal roughness (Sa) and morphology of polished surfaces were measured and observed. The chemical composition was quantified by EDS. Subsurface features were observed to identify heat-affected zones and defects.
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