TY - GEN
T1 - Slender structure of nickel-titanium shape memory alloy fabricated by continuous directed energy deposition
AU - Gao, Shiming
AU - Bodunde, Philip
AU - Qin, Mian
AU - Liao, Wei Hsin
AU - Guo, Ping
N1 - Funding Information:
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.
Funding Information:
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.
Publisher Copyright:
© 2021 SPIE. All rights reserved.
PY - 2021
Y1 - 2021
N2 - 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.
AB - 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.
KW - Additive manufacturing
KW - Nickel-titanium shape memory alloy
KW - Phase constituent
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U2 - 10.1117/12.2583410
DO - 10.1117/12.2583410
M3 - Conference contribution
AN - SCOPUS:85107472908
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Active and Passive Smart Structures and Integrated Systems XV
A2 - Han, Jae-Hung
A2 - Wang, Gang
A2 - Shahab, Shima
PB - SPIE
T2 - Active and Passive Smart Structures and Integrated Systems XV 2021
Y2 - 22 March 2021 through 26 March 2021
ER -