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Effect of initial surface topography during laser polishing process: Statistical analysis
摘要： Surface finish is one of the most important quality characteristics of fabricated components. Laser polishing (LP) is one of the advanced manufacturing surface finishing techniques that has been recently developed and successfully employed for improving surface quality without deteriorating the overall structural form through surface smoothing by melting and redistributing a thin layer of molten material. This paper advances the statistical analysis of the LP process emphasizing aspects of the effect of the initial surface topography. Flat and ground initial surfaces are used for comparative statistical analysis of initial and polished profiles obtained experimentally. Their profile geometries and surface quality characteristics, such as, roughness, were compared and analyzed. In addition, LP process was experimentally investigated as a thermodynamic operator represented by a transfer function and it was examined by means of a coherence function.
关键词： statistical analysis,initial topography,Laser polishing,travel speed,laser power,surface quality,roughness
更新于2025-09-12 10:27:22
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Surface polishes of the SKD 61 tool steel by a femto pulse laser operating in a wide range of powers
摘要： SKD 61 tool steel workpieces without prior heat treatment are adopted for pulse femto laser polish with the power in a range of 0.1-20 mW. Single-pass tracks are provided first to evaluate the width (W) and depth (D) of groove's lateral profile. With the characteristics exhibited in the nearly constant D/W data and the noticeable changes in the crystal species and the Fe content in this powers range, the three power subregions and the powers required for the solid-(plasma) ablation and the ablation-evaporation plus plasma breakdown transitions can be identified clearly. Surfaces polished with 0, 50, and 70 % as the overlap ratio are presented to investigate the mean areal roughness (Sa) and the highest roughness amplitude (HA) transition, (Sa)0% >> (Sa)50% > (Sa)70% is presented. When the power is applied beyond the threshold (14 mW, 1.7224 J/cm2) for material evaporation and plasma breakdown, affected by the laser fluence (F) in these three subregions and the overlap ratio. As power is applied below the solid-ablation transition (9~10 mW, F: 1.3777~1.5239 J/cm2), (Sa)0% >> (Sa)70% > (Sa)50% is obtained; if it is applied higher than this frequency analysis; phase transformation.
关键词： D/W ratio,femtosecond laser polishing,phase transformation,spatial frequency analysis,ablation threshold
更新于2025-09-12 10:27:22
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Laser Polishing of Additive Manufactured Superalloy
摘要： Laser additive manufacturing has attracted considerable interest as a promising digital manufacturing technology in recent years. However, poor surface quality restricts its practical application. In this paper, we demonstrate the capability of laser polishing in rough surface of additive manufactured Inconel 718 alloy. Both as-received surface and laser-polished surface were analyzed carefully by Confocal Microscope, Scanning Electron Microscopy, Energy Dispersive Spectrometer and X-ray Diffraction. The results revealed that as-received Inconel 718 alloy with surface roughness more than 7 μm could be reduced to less than 0.1 μm through laser polishing (LP) process. Moreover, microstructure, micro-hardness and wear resistance of laser-polished zone were investigated. This preliminary study has shown the potential of laser polishing in improving surface finish and properties of additive manufactured superalloy without damage to the substrate.
关键词： Laser polishing,Additive manufacturing,Inconel 718 alloy
更新于2025-09-12 10:27:22
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Laser surface modification and polishing of additive manufactured metallic parts
摘要： The combination of additive manufacturing (AM) and subsequent laser polishing is a technical approach with high flexibility in comparison to conventional processes. AM parts often present the need of post-processing due to surfaces with roughness higher than the admissible for most applications. The laser polishing consists in ablation and melting of a small amount of material, through laser irradiation, which is redistributed to create a surface with low roughness and probably new functionalities. Besides the flexibility, laser polishing presents high processing speed and capability for localized surface treatment. In this study, the resulting characteristics of AM parts irradiated by laser sources with different technical features are investigated and discussed. The parameters applied were the pulse duration, scan speed, repetition rate and average laser power. To evaluate the impact of laser processing on the material the microstructure and surface roughness were analysed and correlated to the process parameters.
关键词： post-processing,Additive manufacturing,laser polishing,surface modification
更新于2025-09-12 10:27:22
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Surface and property characterization of laser polished Ti6Al4V
摘要： Laser polishing is being increasingly utilized as a method of surface treatment for metal alloys, and the rapid heating and cooling in the process significantly modify the subsurface material properties. However, understanding the effect of laser polishing on the properties is still incomplete. In this study, laser polishing of titanium alloys is experimentally investigated, in which the polishing parameters are determined by the energy conservation and the surface roughness can be effectively decreased, from 7.3 to approximately 0.6 μm through the orthogonal experiments. Through thermal cycle analysis of the laser polishing based on the finite element method, the martensite formation occurs in the substrate, which leads the 25% increase of the micro-hardness. The corrosion resistance improvement of the polished surface is attributed to the reduction of surface roughness and the increase of grain size in the polished zone.
关键词： Laser polishing,Electrochemical corrosion,Surface roughness,Microstructure
更新于2025-09-11 14:15:04