Microstructure and corrosion resistance of laser-welded crossed nitinol wires

Peng Dong, Runhua Yao, Zheng Yan, Zhifeng Yan, Wenxian Wang, Xiuli He, Jun Zhou

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number842
JournalMaterials
Volume11
Issue number5
DOIs
StatePublished - May 18 2018

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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