研究目的
Investigating the effects of laser polishing (LP) on the surface morphology, mechanical properties, and biocompatibility of Ti6Al4V components fabricated by selective laser melting (SLM).
研究成果
LP significantly improved the surface quality, mechanical properties, and biocompatibility of SLM-based Ti6Al4V components. The LP-2 parameters exhibited the best performance in reducing surface roughness, improving fatigue life, and enhancing cell adhesion and proliferation. These findings suggest that LP is a promising post-processing method for improving the performance of SLM-based implants.
研究不足
The study focused on the effects of LP on Ti6Al4V components fabricated by SLM. The influence of LP on other materials or fabrication methods was not investigated. The study also did not explore the long-term effects of LP on implant performance in vivo.
1：Experimental Design and Method Selection:
LP was applied to improve the surface finish of SLM-based Ti6Al4V components. The study focused on the effects of different laser energy densities on surface quality, mechanical properties, and biocompatibility.
2：Sample Selection and Data Sources:
Commercial Ti6Al4V alloy was used, and specimens were manufactured through SLM. The study included as-received samples and samples treated with three different LP parameters.
3：List of Experimental Equipment and Materials:
A nanosecond pulsed fiber laser with a laser scanning galvanometer system was used for polishing. Characterization was performed using SEM, LSCM, micro X-ray CT, Vickers hardness tester, tensile machine, and fatigue test system.
4：Experimental Procedures and Operational Workflow:
Samples were polished under an argon atmosphere to prevent oxidation. After LP, samples underwent annealing to relieve residual stresses. Surface morphology, porosity, mechanical properties, and biocompatibility were evaluated.
5：Data Analysis Methods:
Surface roughness was measured using LSCM. Wettability was assessed by measuring contact angles. Porosity was visualized and assessed with micro X-ray CT. Mechanical properties were evaluated through tensile and fatigue tests. Cell adhesion and proliferation were assessed using fluorescence imaging and CCK-8 assay.
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nanosecond pulsed fiber laser
1064 nm, 270 ns pulse duration, 50 kHz repetition rate, 150 μm spot size, 75 μm hatching pitch, and 3750 mm/s beam scanning speed
Used for laser polishing of the samples
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scanning electron microscope
JSM-7100F
Tokyo, Japan
Used to observe surface morphology
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laser scanning confocal microscope
VL2000DX-SVF18SP
Yokohama, Japan
Used to observe surface morphology and measure surface roughness
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micro X-ray computed tomography
nano voxel 4000
Tianjin, China
Used to visualize and assess porosity of the samples
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Vickers hardness tester
Used to measure the hardness of the sample surface
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tensile machine
Used to perform tensile tests
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fatigue test system
Instron E10000
Instron, Canton, MA, USA
Used to conduct fatigue tests
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laser scanning confocal microscope
FV1000
Olympus, Tokyo, Japan
Used to visualize the morphology of cells on the surface of the samples
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microplate reader
Model 680
Hercules, CA, USA
Used to measure the absorbance value of the supernatant
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