Title

Evolution of functional properties realized by increasing laser scanning speed for the selective laser melting fabricated NiTi alloy

Document Type

Journal Article

Publisher

Elsevier

School

School of Engineering

RAS ID

29080

Funders

Funding information available at: https://doi.org/10.1016/j.jallcom.2019.06.340

Comments

Originally published as: Yang, Y., Zhan, J. B., Sun, Z. Z., Wang, H. L., Lin, J. X., Liu, Y. J., & Zhang, L. C. (2019). Evolution of functional properties realized by increasing laser scanning speed for the selective laser melting fabricated NiTi alloy. Journal of Alloys and Compounds, 804, 220-229. Original publication available here

Abstract

The near equiatomic NiTi alloy was fabricated with selective laser melting method at a constant laser power coupled various scanning speeds from 300 mm/s to 480 mm/s. The evolution of functional properties was observed on cyclic tensile curves with emphases on the critical stress for inducing martensitic transformation and the mechanical recoverable strain. Results show that the critical stress for inducing martensitic transformation increases linearly with scanning speed, and the mechanical recoverable strain is indeed enhanced by increase of the scanning speed. Further, the highest mechanical recoverable strain of 2.29% is achieved at the applied strain of 4.5% in the sample fabricated with the highest scanning speed of 480 mm/s. The phase constitution, microstructural features and crystallographic texture were characterized in detail to interpret such evolution. It is found that the different Ms temperature and corresponding different phase constitution obtained with different scanning speed are mainly responsible for the variation of critical stress for inducing martensitic transformation and the mechanical recoverable strain. The co-existence of//BD and//BD crystallographic textures, as well as the variation of dislocation density show limited effect on the evolution amongst different samples.

DOI

10.1016/j.jallcom.2019.06.340

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