Abstract In recent years, the aluminum alloys parts produced by Selective Laser Melting (SLM) are increasingly used instead of casting aluminum alloys parts in the automotive, aerospace and other fields. However, the high surface roughness of the vertical surfaces is a major issue influencing the application of SLM for aluminum. Moreover, most of the methods to reduce the surface roughness, such as polishing, bead blasting or machining, will increase the production delays and costs. The present study aims at evaluating the effect of linear energy density on the surface roughness of the vertical planes. Both deposited tracks and volumetric specimens were produced and the morphologies and the surface roughnesses were measured. The obtained results indicate that the surface roughness of the vertical planes was reduced to 4 μm from 15 μm when deposited a suitable linear energy density, reducing the surface roughness by more than 70%. The surface morphologies and the height change rate of the deposited tracks had a significant influence on the surface roughness. Furthermore, for experiments with the same linear energy density, the surface roughness was improved with higher laser power.

中文翻译：

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工艺参数对激光选区熔化AlSi10Mg零件垂直表面粗糙度的影响

摘要 近年来，在汽车、航空航天等领域，选择性激光熔化（SLM）生产的铝合金零件越来越多地代替铸造铝合金零件。然而，垂直表面的高表面粗糙度是影响铝的 SLM 应用的主要问题。此外，大多数降低表面粗糙度的方法，例如抛光、喷砂或机械加工，都会增加生产延迟和成本。本研究旨在评估线性能量密度对垂直平面表面粗糙度的影响。制备了沉积轨迹和体积试样，并测量了形态和表面粗糙度。所得结果表明，当沉积合适的线性能量密度时，垂直面的表面粗糙度从 15 μm 降低到 4 μm，表面粗糙度降低 70% 以上。沉积轨迹的表面形貌和高度变化率对表面粗糙度有显着影响。此外，对于具有相同线性能量密度的实验，表面粗糙度随着激光功率的提高而提高。