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<p>This study is to investigate the effects of remelting laser power and overhanging angle on the forming quality and surface quality of laser powder bed fusion TC4 (Ti6Al4V) bridge overhanging structure. The experimental results indicate that, within a certain range of remelting power, laser remelting technology can improve the upper surface quality and density of the sample. However, as the remelting power increases, the upper surface quality and density of the sample gradually deteriorate. In addition, at the same remelting power, the upper surface quality and density of the sample gradually improve with the overhanging angle increasing. When the overhanging angle is 90° and the remelting power is 110 W, the upper surface quality and density of the sample are the best. The density has reached 99.2%, increasing by 1.7%, and the upper surface roughness is 14&#xa0;µm, decreasing by 80.6%, compared with the non-remelted sample. With the remelting power increasing, the spherical protrusion appeared on the lower surface of the sample, which was caused by the downward intrusion of the molten pool. The roughness of the lower surfaces of samples shows irregular changes. The remelting process does not necessarily improve the quality of the lower surface of the sample.</p>

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Experimental Study on the Surface Quality of TC4 Laser Powder Bed Fusion Bridge Overhanging Structure with Remelting Process

  • 期刊论文

  • 发表日期：

    2025年9月26日

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  • Zechao Hu,
  • Jian Han,
  • Wentian Shi,
  • Zhexi Wen,
  • Xiaoyu Chen

摘要

This study is to investigate the effects of remelting laser power and overhanging angle on the forming quality and surface quality of laser powder bed fusion TC4 (Ti6Al4V) bridge overhanging structure. The experimental results indicate that, within a certain range of remelting power, laser remelting technology can improve the upper surface quality and density of the sample. However, as the remelting power increases, the upper surface quality and density of the sample gradually deteriorate. In addition, at the same remelting power, the upper surface quality and density of the sample gradually improve with the overhanging angle increasing. When the overhanging angle is 90° and the remelting power is 110 W, the upper surface quality and density of the sample are the best. The density has reached 99.2%, increasing by 1.7%, and the upper surface roughness is 14 µm, decreasing by 80.6%, compared with the non-remelted sample. With the remelting power increasing, the spherical protrusion appeared on the lower surface of the sample, which was caused by the downward intrusion of the molten pool. The roughness of the lower surfaces of samples shows irregular changes. The remelting process does not necessarily improve the quality of the lower surface of the sample.