4.6 Article

In-Situ Laser Polishing Additive Manufactured AlSi10Mg: Effect of Laser Polishing Strategy on Surface Morphology, Roughness and Microhardness

Journal

MATERIALS
Volume 14, Issue 2, Pages -

Publisher

MDPI
DOI: 10.3390/ma14020393

Keywords

additive manufacturing; laser polishing; surface roughness; microhardness

Funding

  1. National Key Research and Development Program of China [2017YFB1103900]
  2. Natural Science Foundation of Guangdong Province [2018A030313044]
  3. Science and Technology Program of Shenzhen, China [JCYJ20170816171733384]
  4. Key Research and Development Program of Sichuan Province, China [2020YFSY0054]
  5. Key Research and Development Program of Hubei province [2020BAB045]

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The study investigates the impact of laser polishing on the surface quality of AlSi10Mg material, showing significant reduction in surface roughness and improvement in microhardness. Better surface quality can be achieved by adjusting the parameters of laser polishing.
Laser polishing is a widely used technology to improve the surface quality of the products. However, the investigation on the physical mechanism is still lacking. In this paper, the established numerical transient model reveals the rough surface evolution mechanism during laser polishing. Mass transfer driven by Marangoni force, surface tension and gravity appears in the laser-induced molten pool so that the polished surface topography tends to be smoother. The AlSi10Mg samples fabricated by laser-based powder bed fusion were polished at different laser hatching spaces, passes and directions to gain insight into the variation of the surface morphologies, roughness and microhardness in this paper. The experimental results show that after laser polishing, the surface roughness of Ra and Sa of the upper surface can be reduced from 12.5 mu m to 3.7 mu m and from to 29.3 mu m to 8.4 mu m, respectively, due to sufficient wetting in the molten pool. The microhardness of the upper surface can be elevated from 112.3 HV to 176.9 HV under the combined influence of the grain refinement, elements distribution change and surface defects elimination. Better surface quality can be gained by decreasing the hatching space, increasing polishing pass or choosing apposite laser direction.

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