Abstract Laser Powder Bed Fusion (L-PBF) provides ample freedom to fabricate lattice materials with tailored micro-architecture. Nevertheless, small-scale structures often suffer from a wide range of morphological defects, which impact the macro-scale mechanical properties. In this work, prominent morphological factors including geometric irregularities (surface notches and cross-section deviation), node geometry and printing direction are assessed for four batches of L-PBF Ti-6Al-4 V cubic lattice specimens, and their fatigue behavior compared. The results show that smoothing the strut fillets at their node remarkably improves the S-N curves and that the printing direction impacts both the fatigue strength and the failure behavior.

中文翻译：

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节点圆角、单元尺寸和支柱取向对通过激光粉末床融合增材制造的 Ti-6Al-4V 晶格材料疲劳强度的作用

摘要 激光粉末床融合 (L-PBF) 为制造具有定制微结构的晶格材料提供了足够的自由。然而，小尺度结构往往存在范围广泛的形态缺陷，这会影响宏观尺度的力学性能。在这项工作中，对四批 L-PBF Ti-6Al-4 V 立方晶格试样的几何不规则性（表面缺口和横截面偏差）、节点几何形状和印刷方向等突出的形态因素进行了评估，并比较了它们的疲劳行为。结果表明，在节点处平滑支柱圆角可以显着改善 SN 曲线，并且打印方向会影响疲劳强度和失效行为。