| LI Jian,YANG Ye,JIN Wei-feng,ZENG Zi-han,YAN Si-qin.Error Remapping of Surface Morphology by Laser Polishing[J],49(2):309-315 |
| Error Remapping of Surface Morphology by Laser Polishing |
| Received:October 13, 2019 Revised:February 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.02.039 |
| KeyWord:laser polishing duplication surface microstructure nanosecond pulsed laser stainless steel laser energy density |
| Author | Institution |
| LI Jian |
a.School of Materials Science and Engineering, Jiangsu University, Zhenjiang , China |
| YANG Ye |
a.School of Materials Science and Engineering, Jiangsu University, Zhenjiang , China |
| JIN Wei-feng |
b.School of Mechanical Engineering, Jiangsu University, Zhenjiang , China |
| ZENG Zi-han |
a.School of Materials Science and Engineering, Jiangsu University, Zhenjiang , China |
| YAN Si-qin |
a.School of Materials Science and Engineering, Jiangsu University, Zhenjiang , China |
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| Abstract: |
| The work aims to explore error remapping of surface morphology during laser polishing. The stainless steel surface was firstly written by nanosecond pulsed fiber laser to fabricate microstructure and then the surface of the prefabricated microstructure was polished by the nanosecond pulsed fiber laser. The surface morphology after processing was measured by an ultra-depth microscope and the variation of the surface morphology with the polishing parameters was investigated. The parameters of the nanosecond pulsed fiber laser were as follows: 1064 nm in wavelength, ~200 ns in pulse duration and 20 W in laser power. In the direct writing by laser, grooves with different depths were marked several times on the surface of stainless steel by the laser beam with the energy density of 18 W, the pulse frequency of 20 kHz, and the scanning speed of 500 mm/s. The local microstructures were laser-polished by nanosecond laser with low energy density (6 W, 4 W, 2 W, 1 W, 0.2 W). The distance between the scanning lines was set as 10 microns, and the scanning speed was set to 200 mm/s. The 2 mm×2 mm area containing grooves and the bulges were polished twice. There were larger edge bulges around the grooves directly written. Laser polishing could effectively reduce the height of the bulge around the groove. The height of the bulge around the groove could be reduced to less than 2 microns through appropriate polishing parameters. For the initial height of the bulge around groove greater than 10 μm, the bulge height after polishing decreased linearly with the increase of laser power density when the laser power density was greater than 2 W. Oppositely, the bulge height around the groove did not change significantly with the laser power density when the laser power density was less than 2 W. For the initial height of the bulge around the groove less than 10 μm, a polishing saturation occurred for laser polishing at higher laser power, i.e. the change of the bulge height with laser power density was not obvious. After laser polishing, residual microstructure will be formed on the surface of the existing stainless steel, thus showing a certain law of shape duplication. After polishing, the raised height of the groove edge decreases with the increase of the laser energy density, which is basically changed in a manner of linear regularity. |
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