Abstract
The continuous directed energy deposition (DED) method has been utilized to process various kinds of slender structures with different materials due to its uninterrupted characteristics. The characteristics of the specimen fabricated by this continuous DED method may not be the same as that in the conventional DED method due to different temperature histories. In this study, the characteristics of NiTi shape memory alloy on phase constituent and microstructure are investigated. Results indicate that the specimen fabricated with higher laser power shows more Ti2Ni precipitation, increased defects (e.g., voids, inclusion, etc.), and larger grain size. The microstructure at different regions presents diverse morphologies, which change from columnar dendrite to equiaxed grain to columnar dendrite due to different cooling rates. The preliminary study in this paper is expected to lay the foundation for the fabrication of NiTi slender structures with the continuous DED method.
Original language | English (US) |
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Title of host publication | Active and Passive Smart Structures and Integrated Systems XV |
Editors | Jae-Hung Han, Gang Wang, Shima Shahab |
Publisher | SPIE |
ISBN (Electronic) | 9781510640054 |
DOIs | |
State | Published - 2021 |
Event | Active and Passive Smart Structures and Integrated Systems XV 2021 - Virtual, Online, United States Duration: Mar 22 2021 → Mar 26 2021 |
Publication series
Name | Proceedings of SPIE - The International Society for Optical Engineering |
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Volume | 11588 |
ISSN (Print) | 0277-786X |
ISSN (Electronic) | 1996-756X |
Conference
Conference | Active and Passive Smart Structures and Integrated Systems XV 2021 |
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Country/Territory | United States |
City | Virtual, Online |
Period | 3/22/21 → 3/26/21 |
Funding
This work was supported by the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. CUHK14202219) and the start-up fund from McCormick SchoolofEngineering,Northwestern University, Evanston, IL, USA. This work was supported by the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. CUHK14202219) and the start-up fund from McCormick School of Engineering, Northwestern University, Evanston, IL, USA.
Keywords
- Additive manufacturing
- Nickel-titanium shape memory alloy
- Phase constituent
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering