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Title: Effect of post-weld heat-treatment on the stress-corrosion cracking behaviour of laser-welded shape memory NiTi wires in Hanks' solution
Authors: Chan, CW
Man, HC 
Keywords: Laser welding
Post-weld heat-treatment
Shape memory alloys
Stress corrosion cracking
Issue Date: 2015
Publisher: American Scientific Publishers
Source: Nanoscience and nanotechnology letters, 2015, v. 7, no. 3, p. 276-280 How to cite?
Journal: Nanoscience and nanotechnology letters 
Abstract: In this study, the stress-corrosion cracking (SCC) behaviour of laser-welded NiTi wires before and after post-weld heat-treatment (PWHT) was investigated. The samples were subjected to slow strain rate testing (SSRT) under tensile loading in Hanks' solution at 37.5 ¢XC (or 310.5 K) at a constant anodic potential (200 mVSCE). The current density of the samples during the SSRT was captured by a potentiostat, and used as an indicator to determine the susceptibility to SCC. Fractography was analyzed using scanning-electron microscopy (SEM). The experimental results showed that the laser-welded sample after PWHT was immune to the SCC as evidenced by the stable current density throughout the SSRT. This is attributed to the precipitation of fine and coherent nano-sized Ni4Ti3 precipitates in the welded regions (weld zone, WZ and heat-affected zone, HAZ) after PWHT, resulting in (i) enrichment of TiO2 content in the passive film and (ii) higher resistance against the local plastic deformation in the welded regions.
ISSN: 1941-4900 (print)
DOI: 10.1166/nnl.2015.1919
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