Influence of ns-Laser Cleaning Parameters on the Removal of the Painted Layer and Selected Properties of the Base Metal |
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| Authors: | Xinyan Li Dan Wang Juming Gao Weiwei Zhang Canyang Li Nianzheng Wang Yucheng Lei |
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| Affiliation: | 1.School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China; (X.L.); (J.G.); (W.Z.); (C.L.); (Y.L.);2.Key Laboratory of High-end Structural Materials of Jiangsu Province, Jiangsu University, Zhenjiang 212013, China;3.Key Laboratory of Agricultural Machinery Equipment Remanufacturing Technology of Jiangsu Province, Jiangsu University, Zhenjiang 212013, China;4.Suzhou Dvellk Photo-Electricity Technology Co., Ltd., Suzhou 215000, China; |
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| Abstract: | The removal of the surface paint of Q345 (Gr·B) steel, as well as microstructure and hardness of the cleaned surface were investigated. The laser source used in this study is a nanosecond pulsed Gaussian light source. The surface morphology and microstructure were characterized by a scanning electron microscope and electron back-scattered diffraction. A hardness test was used for capturing variations of the parameter of the cleaned region in comparison to the base metal. The results show that when the X-scanning speed was 1500 mm/s and Y-moving speeds was 7 mm/s during ns-laser cleaning, respectively, the cleaned surface was relatively flat and there was only a few small residual paint. In addition, the contents of Fe and C elements on the cleaned surface reached to 89% and 9%, respectively. Moreover, the roughness was the lowest of 0.5 μm through the observation of the three-dimensional topography. In addition, a fine grain layer appeared on the cleaned surface after laser cleaning at the X-scanning speeds of 500 mm/s and 1000 mm/s. The maximum hardness of the fine grain layer was more than 400 HV, higher than the base metal. |
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| Keywords: | ns-laser cleaning paint layer roughness element distribution fine grain layer |
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