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Open AccessArticle

Microstructure and Corrosion Resistance of Laser-Welded Crossed Nitinol Wires

1
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2
College of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
3
Department of Mechanical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China
4
Department of Mechanical Engineering, Pennsylvania State University, Erie, PA 16563, USA
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(5), 842; https://doi.org/10.3390/ma11050842
Received: 29 March 2018 / Revised: 2 May 2018 / Accepted: 16 May 2018 / Published: 18 May 2018
Laser welding has been considered to be one of the most promising joining processes for Nitinol medical device manufacturing. Presently, there is still a limited understanding about how laser welding affects the microstructure and the resultant corrosion behaviors. This work aimed to reveal the microstructural factors that influence the corrosion resistance of laser-welded crossed Nitinol joints. The microstructures within various zones of the joints were characterized by using transmission electron microscopy (TEM), and the corrosion behaviors of the joints in 0.9% NaCl and Hank’s solutions were studied. The base metal exhibits a single austenite (B2) phase and the highest corrosion resistance. The phase constituent of the fusion zone is the coexistence of the B2 matrix and some precipitates (T2Ni, TiNi3, and Ti3Ni4 particles), resulting in a slight decrease in corrosion resistance. The heat affected zone (HAZ) shows the austenite matrix but with the precipitation of R-phase, which considerably reduces the corrosion potential, making it the weakest zone. View Full-Text
Keywords: nickel–titanium; laser welding; intermetallics; corrosion nickel–titanium; laser welding; intermetallics; corrosion
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Dong, P.; Yao, R.; Yan, Z.; Yan, Z.; Wang, W.; He, X.; Zhou, J. Microstructure and Corrosion Resistance of Laser-Welded Crossed Nitinol Wires. Materials 2018, 11, 842.

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