期刊
OPTICS AND LASERS IN ENGINEERING
卷 49, 期 1, 页码 121-126出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2010.08.007
关键词
Shape memory alloy; NiTi; Laser welding; Taguchi method; Pitting corrosion
类别
资金
- Research Office of The Hong Kong Polytechnic University, Hong Kong Special Administrative Region, China [G-U405]
In this study, two 127 Taguchi experiments were carried out to study the effect of fibre laser welding parameters and their interactions upon the weld bead aspect ratio of nickel-titanium thin foil. The optimum parameters to produce full penetrated weld with the largest aspect ratio and desirable microstructure were successfully obtained by the Taguchi experimental design. The corrosion property of the optimized NiTi weld in Hank's solution at 37.5 degrees C was studied and compared with the as-received NiTi. To improve the corrosion properties of the weld, the effect of post-weld-heat-treatments ranging from 573 to 1173 K was investigated. The corrosion properties, surface morphology, microstructure and Ti/Ni ratio of the heat-treated NiTi weld were analysed. It was found that a post-weld heat treatment at 573 K for 1 h provided the best pitting corrosion resistance at the weld zone. (C) 2010 Elsevier Ltd. All rights reserved.
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