Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/19341
Title: Reduction of environmentally induced cracking of laser-welded shape memory NiTi wires via post-weld heat-treatment
Authors: Chan, CW
Man, HC 
Keywords: Hydrogen embrittlement
Laser welding
NiTi
Post-weld heat-treatment
Shape memory alloys
Issue Date: 2013
Publisher: Elsevier
Source: Materials science and engineering. A, Structural materials : properties, microstructure and processing, 2013, v. 588, p. 388-394 How to cite?
Journal: Materials science and engineering. A, Structural materials : properties, microstructure and processing 
Abstract: In this study, the environmentally induced cracking behavior of the NiTi weldment with and without post-weld heat-treatment (PWHT) in Hanks' solution at 37.5. °C at OCP was studied by tensile and cyclic slow-strain-rate tests (SSRT), and compared with those tested in oil (an inert environment). Our previous results in the tensile and cyclic SSRT showed that the weldment without PWHT showed high susceptibility to the hydrogen cracking, as evidenced by the degradation of tensile and super-elastic properties when testing in Hanks' solution. The weldment after PWHT was much less susceptible to hydrogen attack in Hanks' solution as no obvious degradation in the tensile and super-elastic properties was observed, and only a very small amount of micro-cracks were found in the fracture surface. The susceptibility to hydrogen cracking of the NiTi weldment could be alleviated by applying PWHT at the optimized temperature of 350. °C after laser welding.
URI: http://hdl.handle.net/10397/19341
ISSN: 0921-5093
EISSN: 1873-4936
DOI: 10.1016/j.msea.2013.09.051
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