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Effects of Process Parameters upon the Shape Memory and Pseudo-Elastic Behaviors of Laser-Welded NiTi Thin Foil

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Abstract

This article discusses the effects of laser welding parameters such as power, welding speed, and focus position on the weld bead profile, microstructure, pseudo-elasticity (PE), and shape memory effect (SME) of NiTi foil with thickness of 250 μm using 100W CW fiber laser. The parameter settings to produce the NiTi welds for analysis in this article were chosen from a fractional factorial design to ensure the welds produced were free of any apparent defect. The welds obtained were mainly of cellular dendrites with grain sizes ranging from 2.5 to 4.8 μm at the weld centerline. A small amount of Ni3Ti was found in the welds. The onset of transformation temperatures (A s and M s ) of the NiTi welds shifted to the negative side as compared to the as-received NiTi alloy. Ultimate tensile stress of the NiTi welds was comparable to the as-received NiTi alloy, but a little reduction in the pseudo-elastic property was noted. Full penetration welds with desirable weld bead profiles and mechanical properties were successfully obtained in this study.

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Notes

  1. INSTRON is a trademark of Instron, Canton, MA.

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Acknowledgments

The work described in this article was supported by a research studentship (RGRX) from the Department of Industrial and Systems Engineering, Hong Kong Polytechnic University, HKSAR. The authors also acknowledge SPI and A&P (HK) Co. Ltd. for the provision of the laser facilities.

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Authors and Affiliations

  1. Laser Processing Group, Advanced Manufacturing Technology Research Centre, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, P.R. China

    C. W. Chan (Research Student), H. C. Man (Professor and Head of Department) & T. M. Yue (Professor)

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  1. C. W. Chan
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  2. H. C. Man
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  3. T. M. Yue
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Correspondence to H. C. Man.

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Manuscript submitted June 24, 2010.

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Chan, C.W., Man, H.C. & Yue, T.M. Effects of Process Parameters upon the Shape Memory and Pseudo-Elastic Behaviors of Laser-Welded NiTi Thin Foil. Metall Mater Trans A 42, 2264–2270 (2011). https://doi.org/10.1007/s11661-011-0623-1

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