Microstructure and Corrosion Resistance of Laser-Welded Crossed Nitinol Wires
AbstractLaser 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
Share & Cite This Article
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.
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(5):842.Chicago/Turabian Style
Dong, Peng; Yao, Runhua; Yan, Zheng; Yan, Zhifeng; Wang, Wenxian; He, Xiuli; Zhou, Jun. 2018. "Microstructure and Corrosion Resistance of Laser-Welded Crossed Nitinol Wires." Materials 11, no. 5: 842.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.