Laser Welding of Ti–Ni Shape Memory Alloy for Medical Application
V. Shelyagin$^{1}$, A. Bernatskyi$^{1}$, O. Siora$^{1}$, S. Kedrovskyi$^{2,3}$, Yu. Koval$^{2,3}$, V. Slipchenko$^{2}$, V. Filatova$^{2}$, G. Firstov$^{2}$
$^{1}$E. O. Paton Electric Welding Institute, NAS of Ukraine, 11 Kazymyr Malevych Str., UA-03150 Kyiv, Ukraine
$^{2}$G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{3}$National Technical University of Ukraine ‘Igor Sikorsky Kyiv Polytechnic Institute’, 37 Peremohy Ave., UA-03056 Kyiv, Ukraine
Received: 02.09.2020. Download: PDF
The work is devoted to investigations of laser welding of rolled metal of a medical functional Ti–Ni system alloy. On the basis of the analysis of literary sources and the results of own investigations of the influence of laser welding parameters on functional characteristics of Ti–Ni shape memory alloy, the challenging directions of the further investigations are established. According to the results of the investigations of welds microstructure, concentration dependence of absolute values of recovery deformation during measurement of the shape memory effect, and investigations of phase transitions, it is established that the processes, occurring in welding zone, affect not only the strength of a joint, but also the parameters of martensitic transformation. As established, due to laser radiation and subsequent recrystallization of material in the weld area, the feasibility of shape recovery by the material of the weld body is saved, but characteristic temperatures of direct and reverse martensitic transformations grow up. The direct martensitic transformation in the region of welded joints is observed in the temperature range from 45°С to 20°С. Shape recovery in material of welded joints is observed at temperature range of 60–100°С. The obtained results allow determining the ranges of values in which it is expedient to optimize the parameters of laser treatment modes.
Key words: shape memory alloys, Ti–Ni alloys, laser welding, thermoelastic martensitic transformation, recrystallization.
URL: https://mfint.imp.kiev.ua/en/abstract/v43/i03/0383.html
DOI: https://doi.org/10.15407/mfint.43.03.0383
PACS: 42.62.Be, 42.62.Cf, 62.20.fg, 81.20.Vj, 81.30.Kf
Citation: V. Shelyagin, A. Bernatskyi, O. Siora, S. Kedrovskyi, Yu. Koval, V. Slipchenko, V. Filatova, and G. Firstov, Laser Welding of Ti–Ni Shape Memory Alloy for Medical Application, Metallofiz. Noveishie Tekhnol., 43, No. 3: 383—398 (2021)