研究目的
To investigate the ability of a fiber laser to in-situ polish the rough surfaces of four typical additive-manufactured alloys, namely, Ti6Al4V, AlSi10Mg, 316L and IN718, and to demonstrate the reduction in surface roughness through the application of the laser-polishing process.
研究成果
Laser polishing of SLM samples can be carried out by adjusting the laser parameters, without adding any additional lasers. Laser polishing of four typical alloys with eight laser strategies was carried out by using the printing laser. Observations of the top surface morphology revealed that the polishing effect was obvious and the top surface roughness was greatly reduced. The laser polishing mechanism relies on melting and then re-solidification of metals.
研究不足
The study focused on the in-situ laser polishing of four typical additive-manufactured alloys. The polishing strategy will be optimized by simulation in the following study.
1：Experimental Design and Method Selection
The study involved the use of a fiber laser to polish the surfaces of four typical additive-manufactured alloys. The laser-polishing experiment was performed under an argon atmosphere with an oxygen content of <0.1%, which was the same as that of the printing processing environment.
2：Sample Selection and Data Sources
Four typical alloys were selected, namely, Ti6Al4V, AlSi10Mg, 316L and IN718. The samples, all of which measured 40 mm × 40 mm × 5 mm, were fabricated using SLM equipment.
3：List of Experimental Equipment and Materials
A continuous wave fiber laser (IPG YLR-400, IPG Photonics Corporation) with a wavelength of 1060 nm, a nominal output power of 400 W and a spot size of 100 μm was used in the sample fabrication process. The surface morphologies of the samples before and after laser polishing were observed using a 3D optical profiler (RTEC Up Dual-Mode, Rtec Instruments).
4：Experimental Procedures and Operational Workflow
The sample surface was divided into nine areas, each measuring 10 mm × 10 mm. The laser-polishing experiment was performed using the same laser equipment but laser parameters were adjusted for laser polishing. The experimental parameters corresponding to eight regions are listed in Table 2.
5：Data Analysis Methods
The surface morphologies of the samples before and after laser polishing were observed using a 3D optical profiler. The data were processed using the Gwyddion free and open-source software, which is a modular programme for scanning probe microscopy (SPM) data visualization and analysis.
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