A critical insight into lack-of-fusion pore structures in additively manufactured stainless steel
| Autor: | Majid Laleh, Sam Yang, Anthony E. Hughes, A. Matt Glenn, Jianli Li, Mike Y. Tan, Wei Xu, Jiangting Wang |
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| Rok vydání: | 2021 |
| Předmět: |
0209 industrial biotechnology
Void (astronomy) Materials science Biomedical Engineering Oxide Computed tomography 02 engineering and technology Industrial and Manufacturing Engineering law.invention Metal chemistry.chemical_compound 020901 industrial engineering & automation law medicine General Materials Science Composite material Porosity Engineering (miscellaneous) Fusion medicine.diagnostic_test 021001 nanoscience & nanotechnology Nanocrystalline material chemistry visual_art visual_art.visual_art_medium Electron microscope 0210 nano-technology |
| Zdroj: | Additive Manufacturing. 38:101762 |
| ISSN: | 2214-8604 |
| DOI: | 10.1016/j.addma.2020.101762 |
| Popis: | Despite the obvious advantages of additive manufacturing (AM) in producing metallic parts, defect formation remains a challenge that deleteriously impacts some critical materials properties of AM parts. Here, through electron microscopy and X-ray computed tomography (X-ray CT), new insights are revealed about lack-of-fusion (LOF) pores; the most common defect reported for AM. We show that LOF pores are not simply a void but a complex structure comprising oxide films decorating pore walls and grain refined regions with dislocation structures surrounding the pore. The formation of a thin nanocrystalline metallic layer on the pore wall is also observed. Spatter particles are the source of most LOF structures at high densities typical of recommended processing conditions and can only be eliminated by careful selection of processing parameters. Data constrained modelling, which uses the materials’ properties, was used for generating 3D representations of the complex structure surrounding LOF pores from X-ray CT datasets. |
| Databáze: | OpenAIRE |
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