Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/27725
Title: Susceptibility to stress corrosion cracking of NiTi laser weldment in Hanks' solution
Authors: Chan, CW
Man, HC 
Yue, TM 
Keywords: Intermetallics
Polarization
Intergranular corrosion
Stress corrosion
Welding
Issue Date: 2012
Source: Corrosion science, 2012, v. 57, p. 260-269 How to cite?
Journal: Corrosion Science 
Abstract: In this study, the susceptibility to stress corrosion cracking (SCC) of laser-welded NiTi wires in Hanks' solution at 37.5 °C was studied by the slow strain-rate test (SSRT) at open-circuit potential and at different applied anodic potentials. The weldment shows high susceptibility to SCC when the applied potential is near to the pitting potential of the heat-affected zone (HAZ). The pits formed in the HAZ become sites of crack initiation when stress is applied, and cracks propagate in an intergranular mode under the combined effect of corrosion and stress. In contrast, the base-metal is immune to SCC under similar conditions. The increase in susceptibility to SCC in the weldment could be attributed to the poor corrosion resistance in the coarse-grained HAZ.
URI: http://hdl.handle.net/10397/27725
ISSN: 0010-938X
DOI: 10.1016/j.corsci.2011.12.010
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