Influence of microstructure on stainless steel 316L lattice structures fabricated by electron beam and laser powder bed fusion
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-PB...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2023
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| Online Access: | https://hdl.handle.net/10356/170432 |
| _version_ | 1826115104382386176 |
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| author | Zeng, Zhuohong Wang, Chengcheng Lek, Yung Zhen Tian, Yuanyuan Kandukuri, Sastry Yagnanna Bartolo, Paulo Jorge Da Silva Zhou, Kun |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Zeng, Zhuohong Wang, Chengcheng Lek, Yung Zhen Tian, Yuanyuan Kandukuri, Sastry Yagnanna Bartolo, Paulo Jorge Da Silva Zhou, Kun |
| author_sort | Zeng, Zhuohong |
| collection | NTU |
| description | 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/mm3 and 834.8 mJ/mm3, respectively, at a lattice relative density of ∼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. |
| first_indexed | 2024-10-01T03:50:04Z |
| format | Journal Article |
| id | ntu-10356/170432 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:50:04Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | ntu-10356/1704322023-09-12T03:41:02Z Influence of microstructure on stainless steel 316L lattice structures fabricated by electron beam and laser powder bed fusion Zeng, Zhuohong Wang, Chengcheng Lek, Yung Zhen Tian, Yuanyuan Kandukuri, Sastry Yagnanna Bartolo, Paulo Jorge Da Silva Zhou, Kun School of Mechanical and Aerospace Engineering Singapore Centre for 3D Printing Engineering::Mechanical engineering Powder Bed Fusion Mechanical Response 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/mm3 and 834.8 mJ/mm3, respectively, at a lattice relative density of ∼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. Economic Development Board (EDB) National Research Foundation (NRF) This work was supported by Economic Development Board, Singapore and DNV Singapore Pte. Ltd. through the Industrial Post-graduate Programme with Nanyang Technological University, Singapore, and the National Research Foundation, Singapore under its Medium-Sized Centre funding scheme through the Marine and Offshore Program. 2023-09-12T03:41:01Z 2023-09-12T03:41:01Z 2022 Journal Article Zeng, Z., Wang, C., Lek, Y. Z., Tian, Y., Kandukuri, S. Y., Bartolo, P. J. D. S. & Zhou, K. (2022). Influence of microstructure on stainless steel 316L lattice structures fabricated by electron beam and laser powder bed fusion. Materials Science and Engineering: A, 859, 144225-. https://dx.doi.org/10.1016/j.msea.2022.144225 0921-5093 https://hdl.handle.net/10356/170432 10.1016/j.msea.2022.144225 2-s2.0-85141285942 859 144225 en Materials Science and Engineering: A © 2022 Elsevier B.V. All rights reserved. |
| spellingShingle | Engineering::Mechanical engineering Powder Bed Fusion Mechanical Response Zeng, Zhuohong Wang, Chengcheng Lek, Yung Zhen Tian, Yuanyuan Kandukuri, Sastry Yagnanna Bartolo, Paulo Jorge Da Silva Zhou, Kun Influence of microstructure on stainless steel 316L lattice structures fabricated by electron beam and laser powder bed fusion |
| title | Influence of microstructure on stainless steel 316L lattice structures fabricated by electron beam and laser powder bed fusion |
| title_full | Influence of microstructure on stainless steel 316L lattice structures fabricated by electron beam and laser powder bed fusion |
| title_fullStr | Influence of microstructure on stainless steel 316L lattice structures fabricated by electron beam and laser powder bed fusion |
| title_full_unstemmed | Influence of microstructure on stainless steel 316L lattice structures fabricated by electron beam and laser powder bed fusion |
| title_short | Influence of microstructure on stainless steel 316L lattice structures fabricated by electron beam and laser powder bed fusion |
| title_sort | influence of microstructure on stainless steel 316l lattice structures fabricated by electron beam and laser powder bed fusion |
| topic | Engineering::Mechanical engineering Powder Bed Fusion Mechanical Response |
| url | https://hdl.handle.net/10356/170432 |
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