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Journal of Materials Engineering and Performance

Published in:

01-09-2015

Microstructure, Cyclic Deformation and Corrosion Behavior of Laser Welded NiTi Shape Memory Wires

Authors: G. R. Mirshekari, A. Kermanpur, A. Saatchi, S. K. Sadrnezhaad, A. P. Soleymani

Published in: Journal of Materials Engineering and Performance | Issue 9/2015

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Abstract

The present paper reports the effects of Nd:YAG laser welding on the microstructure, phase transformation, cyclic deformation behavior, and corrosion resistance of Ti-55 wt.% Ni wire. The results showed that the laser welding altered the microstructure of the weld metal which mainly composed of columnar dendrites grown epitaxially from the fusion line. DSC results indicated that the onset of the transformation temperatures of the weld metal differed from that of the base metal. Cyclic stress-strain behavior of laser-welded NiTi wire was comparable to the as-received material; while a little reduction in the pseudo-elastic property was noted. The weld metal exhibited higher corrosion potential, lower corrosion current density, higher breakdown potential and wider passive region than the base metal. The weld metal was therefore more resistant to corrosion than the base metal.

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Title: Microstructure, Cyclic Deformation and Corrosion Behavior of Laser Welded NiTi Shape Memory Wires
Authors: G. R. Mirshekari
A. Kermanpur
A. Saatchi
S. K. Sadrnezhaad
A. P. Soleymani
Publication date: 01-09-2015
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 9/2015
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-015-1614-y

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