Slender structure of nickel-titanium shape memory alloy fabricated by continuous directed energy deposition

Shiming Gao; Philip Bodunde; Mian Qin; Wei-Hsin Liao; Ping Guo

doi:10.1117/12.2583410

22 March 2021 Slender structure of nickel-titanium shape memory alloy fabricated by continuous directed energy deposition

Shiming Gao, Philip Bodunde, Mian Qin, Wei-Hsin Liao, Ping Guo

Author Affiliations +

Proceedings Volume 11588, Active and Passive Smart Structures and Integrated Systems XV; 1158810 (2021) https://doi.org/10.1117/12.2583410
Event: SPIE Smart Structures + Nondestructive Evaluation, 2021, Online Only

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.

Conference Presentation

Citation Download Citation

Shiming Gao, Philip Bodunde, Mian Qin, Wei-Hsin Liao, and Ping Guo "Slender structure of nickel-titanium shape memory alloy fabricated by continuous directed energy deposition", Proc. SPIE 11588, Active and Passive Smart Structures and Integrated Systems XV, 1158810 (22 March 2021); https://doi.org/10.1117/12.2583410

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