期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.144225
关键词
Re-entrant structure; Powder bed fusion; Mechanical response; Crystallographic texture; Strengthening mechanism
类别
资金
- Economic Development Board, Singapore
- DNV Singapore Pte. Ltd. through the Industrial Post-graduate Programme with Nanyang Technological University, Singapore
- National Research Foundation, Singapore under its Medium-Sized Centre funding scheme through the Marine and Offshore Program
In this study, three-dimensional stainless steel 316L re-entrant lattice structures were fabricated using two mainstream powder bed fusion techniques. Different grain morphology and crystallographic textures were found in the samples, which significantly influenced their mechanical properties. The study provides insights into the enhancement of the mechanical properties of additively manufactured metallic lattice structures through microstructural control.
In this work, three-dimensional stainless steel 316L re-entrant lattice structures were fabricated by two mainstream powder bed fusion (PBF) techniques, namely electron beam PBF (EB-PBF) and laser PBF (L-PBF). Different grain morphology and crystallographic textures were found in the EB-PBF and L-PBF samples, which significantly influenced their mechanical properties through microscopic deformation. The EB-PBF and L-PBF samples achieved energy absorption capacities of 627.4 mJ/mm(3) and 834.8 mJ/mm(3), respectively, at a lattice relative density of similar to 24%. The EB-PBF sample exhibited equiaxed and elongated grains, while elongated grains were primarily observed in the L-PBF sample. The dominant deformation mechanism of the EB-PBF sample was obtained through dislocation. In contrast, the dislocations trapped inside the solidification cellular walls and deformation-induced twinning were the dominant deformation mechanisms for the L-PBF sample, which contributed to its superior compressive strength and energy absorption capacities. This work provides insights into the enhancement of the mechanical properties of the additively manufactured metallic lattice structures through microstructural control.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据