Format

Send to

Choose Destination
Materials (Basel). 2018 May 18;11(5). pii: E842. doi: 10.3390/ma11050842.

Microstructure and Corrosion Resistance of Laser-Welded Crossed Nitinol Wires.

Author information

1
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China. dongpeng@tyut.edu.cn.
2
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China. yrh_77@163.com.
3
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China. Z_Yan@tju.edu.cn.
4
College of Materials Science and Engineering, Tianjin University, Tianjin 300072, China. Z_Yan@tju.edu.cn.
5
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China. yanzhifeng@tyut.edu.cn.
6
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China. wwx960@126.com.
7
Department of Mechanical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China. hexl_ocean@163.com.
8
Department of Mechanical Engineering, Pennsylvania State University, Erie, PA 16563, USA. juz17@psu.edu.

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.

KEYWORDS:

corrosion; intermetallics; laser welding; nickel–titanium

Supplemental Content

Full text links

Icon for Multidisciplinary Digital Publishing Institute (MDPI) Icon for PubMed Central
Loading ...
Support Center