Solidification crack propagation and morphology dependence on processing parameters in AA6061 from ultra-high-speed x-ray visualization
| Autor: | Ziheng Wu, Guannan Tang, Kamel Fezzaa, Cang Zhao, Joseph Pauza, Tao Sun, Niranjan D. Parab, Runbo Jiang, Po-Ju Chiang, Nadia Kouraytem, Anthony D. Rollett, Ross B. Cunningham, Christopher Kantzos |
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| Rok vydání: | 2021 |
| Předmět: |
0209 industrial biotechnology
Materials science Morphology (linguistics) Biomedical Engineering Fracture mechanics 02 engineering and technology Substrate (electronics) 021001 nanoscience & nanotechnology X ray visualization Industrial and Manufacturing Engineering Characterization (materials science) Cracking 020901 industrial engineering & automation General Materials Science Composite material 0210 nano-technology Porosity Engineering (miscellaneous) Keyhole |
| Zdroj: | Additive Manufacturing. 42:101959 |
| ISSN: | 2214-8604 |
| DOI: | 10.1016/j.addma.2021.101959 |
| Popis: | Solidification or hot cracks are commonly observed defects in a number of metal alloys and may lead to deterioration of additively manufactured parts quality. In this study, ultra-high-speed x-ray radiography experiments enable the observation and characterization of bundles of hot-cracks that form in monobloc AA6061 substrate. The crack bundles are related to meltpool characteristics and pore formation. Crack propagation rate is also presented for the case of a crack that initiates from a pore. Two types of relevant pore formation are also described, namely keyhole porosity and crack-remelting porosity. The results of this study are expected to facilitate the validation of theoretical and numerical models of solidification cracking. |
| Databáze: | OpenAIRE |
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