研究目的
Investigating the effects of laser polishing on the surface finish, microstructure, and mechanical properties of additive manufactured Inconel 718 superalloy.
研究成果
Laser polishing effectively improves the surface finish of SLM IN718 superalloy, reducing surface roughness from 7.5μm to less than 0.1μm. It also enhances micro-hardness and wear resistance without damaging the substrate. The study demonstrates the potential of laser polishing as a post-processing technique for additive manufactured components.
研究不足
The study focuses on the effects of laser polishing on SLM IN718 superalloy. The applicability of the findings to other materials or manufacturing processes may require further investigation.
1：Experimental Design and Method Selection
The study used a nanosecond pulsed fiber laser for polishing the surface of SLM IN718 superalloy. The process parameters were optimized to achieve the desired surface finish.
2：Sample Selection and Data Sources
A flat sample of Ni-based superalloy Inconel 718 (IN718) manufactured by SLM was used. The initial surface roughness was Ra=7.5±0.5μm.
3：List of Experimental Equipment and Materials
Nanosecond pulsed fiber laser (wavelength: λem. = 1060nm; average output power: P=100W; repetition frequency: fp =1-1000kHz, pulse duration: tP=12-500ns; spot diameter: 50μm), IN718 sample, Confocal Microscope, SEM, Energy Dispersive Spectrometer, X-ray Diffraction, Vickers hardness tester, ball-on-disk tribometer.
4：Experimental Procedures and Operational Workflow
The samples were cleaned ultrasonically before laser polishing. The polishing process was conducted in a closed chamber filled with inert gas (Ar) to prevent oxidation. After polishing, samples were cleaned again for testing and characterization.
5：Data Analysis Methods
Surface morphology and roughness were analyzed using OM, SEM, LSCM, and surface roughness measuring instrument. Micro-hardness was measured using a Vickers hardness tester. Tribological performance was assessed using a ball-on-disk tribometer.
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SEM
Hitachi SU8010
Hitachi
Used for analyzing the surface morphology of the samples.
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Nanosecond pulsed fiber laser
Used for laser polishing the surface of SLM IN718 superalloy.
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Confocal Microscope
Keyence VK-X 100 series
Keyence
Used for analyzing the surface topography of the samples.
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Energy Dispersive Spectrometer
Used for analyzing the elemental composition of the samples.
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X-ray Diffraction
D/MAX2200pc
Used for analyzing the phase composition of the samples.
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Vickers hardness tester
FUTURE-TECH FM-800
FUTURE-TECH
Used for measuring the micro-hardness of the samples.
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Ball-on-disk tribometer
UMT-2
CETR
Used for assessing the friction and wear behavior of the samples.
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