研究目的
To study the laser surface ?nishing of components (Ti-6Al-4V alloy) obtained by electron beam melting (EBM) by means of a high-e?ciency ?ber laser operating in continuous wave.
研究成果
The laser treatment can be adopted as a polishing treatment of Ti-6Al-4V samples, achieving a reduction of 80% in roughness in the best conditions. The treatment involves material ablation, and the increase in dimensions must be considered when the components are designed.
研究不足
The polished thickness (HAZ) is very small (about 25 μm at Fd = 5 mm, Ss = 3.6 mm/min), which may limit the applicability of the treatment for certain applications requiring deeper surface modification.
1：Experimental Design and Method Selection:
The study was divided into two phases. The first phase involved preliminary tests to identify the laser parameters (control factors) and their levels for the second phase, where a 2 × 3 factorial plan was defined and tested. The laser energy density and scanning speed were varied during the tests.
2：Sample Selection and Data Sources:
The laser treatment was performed on the external surface of titanium alloy samples built by the EBM technique using gas-atomized Ti6Al4V ELI powders.
3：List of Experimental Equipment and Materials:
A 450 W fiber laser (IPG YLR-450/4500-QCW-MM-AC-Y14) was used for laser finishing. The samples were analyzed using a 3D profilometer, digital microscopy, and scanning electron microscopy.
4：Experimental Procedures and Operational Workflow:
The samples were rotated using a stepping motor at 200 rpm while the laser was moved onto the samples at different speeds. After the laser treatment, the samples were sandblasted and cleaned in an ultrasonic bath.
5：Data Analysis Methods:
ANOVA was performed to assess the influence of the process parameters on sample roughness. The main effect and the interaction plots were plotted to see the effect of the control factors on the laser finishing.
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fiber laser
IPG YLR-450/4500-QCW-MM-AC-Y14
IPG
Used for laser surface finishing of Ti-6Al-4V samples.
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micro cutting head
IPG FLC D 25
IPG
Used to focus the laser beam onto the samples.
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3D surface profiling system
Taylor Hobson Talysurf CLI 2000
Taylor Hobson
Used for roughness measurements on all samples.
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stepping motor
SANYODENKI 103H7126
SANYODENKI
Used to rotate the samples during laser treatment.
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digital microscope
Hirox KH 8700
Hirox
Used to study the surface morphology of as-built and treated samples.
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scanning electron microscopy
Used to analyze the treated surfaces.
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