Scholarlink

A sheet-based Schwartz diamond (SD) lattice structure is a triply minimal surface (TPMS) based lattice that offers higher strength and more surface area per unit volume, making it suitable for lightweight, thermal management, and bio implant applications. Additive manufacturing processes like laser powder bed fusion (LPBF) are used to manufacture such complex lattices. However, such lattices with higher surface area per unit volume are more sensitive to manufacturing deviations from design in terms of morphology as reported in literature. The performance of these structures can be sensitive to such manufacturing induced variation. To reduce the deviations during the manufacturing process of such lattice structure one potential solution is to investigate the effect of different scan strategies and the same is the focus of the present study. In this study, SS316L powder material was used to manufacture a 0.5 mm thick SD lattice structure with a 50% volume fraction using the LPBF manufacturing process with two scan strategies, namely, bidirectional and contour offset. The energy density for both scan strategies to manufacture the lattice structure was kept the same. The morphological aspect of the printed lattice structure was investigated. Results showed that the surface morphology was better in the contour offset scanned part with less deviation from the designed thickness as well as volume fraction as compared to the part fabricated with bidirectional scan strategy. The surface quality was also better in the former scanning strategy. However, powder agglomerates are more visible in the down skin and island parts of the lattice in the contour scan strategy. The printed part density was slightly lower in the contour offset compared to the bidirectional scanned lattice structure. In conclusion, the morphological aspect and surface quality are improved in the contour offset scanned lattice structure, and improvement in process parameters may be required to address the powder agglomerate and part density of the SD lattice structure.

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Influence of Laser Scan Strategy on Morphological Characteristics of Sheet-Based Schwarz Diamond TPMS Lattice Structure Manufactured by LPBF

  • 会议论文

  • 发表日期：

    2025年

查看全文
  • Farhanuzzaman Khan,
  • Gurunathan Saravana Kumar,
  • Jayaganthan Rengaswamy

摘要

A sheet-based Schwartz diamond (SD) lattice structure is a triply minimal surface (TPMS) based lattice that offers higher strength and more surface area per unit volume, making it suitable for lightweight, thermal management, and bio implant applications. Additive manufacturing processes like laser powder bed fusion (LPBF) are used to manufacture such complex lattices. However, such lattices with higher surface area per unit volume are more sensitive to manufacturing deviations from design in terms of morphology as reported in literature. The performance of these structures can be sensitive to such manufacturing induced variation. To reduce the deviations during the manufacturing process of such lattice structure one potential solution is to investigate the effect of different scan strategies and the same is the focus of the present study. In this study, SS316L powder material was used to manufacture a 0.5 mm thick SD lattice structure with a 50% volume fraction using the LPBF manufacturing process with two scan strategies, namely, bidirectional and contour offset. The energy density for both scan strategies to manufacture the lattice structure was kept the same. The morphological aspect of the printed lattice structure was investigated. Results showed that the surface morphology was better in the contour offset scanned part with less deviation from the designed thickness as well as volume fraction as compared to the part fabricated with bidirectional scan strategy. The surface quality was also better in the former scanning strategy. However, powder agglomerates are more visible in the down skin and island parts of the lattice in the contour scan strategy. The printed part density was slightly lower in the contour offset compared to the bidirectional scanned lattice structure. In conclusion, the morphological aspect and surface quality are improved in the contour offset scanned lattice structure, and improvement in process parameters may be required to address the powder agglomerate and part density of the SD lattice structure.