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Zhu R.F.,Tsinghua University | Tang G.Y.,Tsinghua University | Shi S.Q.,Hong Kong Polytechnic University | Fu M.W.,Hong Kong Polytechnic University | Gromov V.E.,Siberian State University of Industry
Applied Physics A: Materials Science and Processing | Year: 2013

Cold-rolled TiNi alloy was treated by electropulsing with different process parameters. The superelasticity, electrical resistivity and microstructure evolution of the TiNi alloy were investigated. The recrystallization is found to happen in the cold-rolled TiNi alloys during electropulsing treatment (EPT) processing and it took 9 s to complete the crystallization in the EPT process. In addition, the grain size increases with the charge voltage and the discharge frequency of the electropulse. The maximum superelasticity of 6.94 % is gained when the TiNi alloy is treated by the electropulsing with the frequency of 300 Hz. The short recrystallization time of the alloy is attributed to the acceleration of atomic diffusion and the movement velocity of the grain boundary by electropulsing. This research provides an in-depth understanding of how the electropulsing affects the microstructure and superelasticity of TiNi alloy. © 2012 Springer-Verlag Berlin Heidelberg. Source


Chen S.,Tsinghua University | Chen S.,Harbin Institute of Technology | Tang G.,Tsinghua University | Song S.,Harbin Institute of Technology | And 2 more authors.
Steel in Translation | Year: 2013

The elctropulsing treatment (EPT) has been successfully applied to the processing of a low carbon Q235 steel strip. Comparing with the conventional heat treatment (CHT), a proper EPT is capable of achieving the similar or even better effect on the mechanical properties of the steel strip. It was found that the optimum combination of the EPT parameters are 180 V in voltage and 500 Hz in frequency (180 V-500 Hz) leading to a combination of tensile strength-elongation of 371 MPa-47.5%. Optical microscopy analyses indicates that the EPT/180 V-500 Hz for Q235 steel strip can accelerate the formation of the completely recrystallized microstructure in which the grain size become relatively finer and more uniform compared to the elongated one formed in the cold-rolled sample. Such phenomenon is consistent with the improvement of the mechanical performance of the Q235 steel sample under the EPT. However, the EPT with inadequate frequency can only result in partial recrystallization of the grains, while the one with an exceed frequency may lead to the apparent grain growth within the sample. Both cases can not produce satisfactory combination of strength and ductility for the steel samples. © 2013 Allerton Press, Inc. Source


Konovalov S.V.,Siberian State University of Industry | Atroshkina A.A.,Siberian State University of Industry | Ivanov Yu.F.,Institute of High Current Electronics | Gromov V.E.,Siberian State University of Industry
Materials Science and Engineering A | Year: 2010

The study of dislocation substructure of stainless 0.45C17Mn3Al steel subjected to a multicyclic fatigue loading and the pulsing current treatment increasing it durability resource are carried out by the methods of transmission electron microscopy. © 2010 Elsevier B.V. All rights reserved. Source


Ivanov Yu.F.,Institute of High Current Electronics | Kosinov D.A.,Siberian State University of Industry | Popova N.A.,Tomsk State University of Architecture and Building | Gromov V.E.,Siberian State University of Industry | Konovalov S.V.,Siberian State University of Industry
Bulletin of the Russian Academy of Sciences: Physics | Year: 2014

Quantitative and qualitative variations in the structure, phase composition, and defect substructure of low-carbon St8ps ferrite steel under conditions of hydrogen saturation and deformation are revealed by means of transmission electron microscopy. © 2014 Allerton Press, Inc. Source


Gromov V.E.,Siberian State University of Industry | Ivanov Yu.F.,Institute of High Current Electronics | Stolboushkina O.A.,Siberian State University of Industry | Konovalov S.V.,Siberian State University of Industry
Materials Science and Engineering A | Year: 2010

The dislocation substructure evolution on Al creep under the action of the weak electric potential is established by methods of transmission diffraction electron microscopy. It is shown that change of the electrical potential of the Al sample surface is accompanied by the increase of dislocation substructure self-organization degree. © 2009 Elsevier B.V. All rights reserved. Source

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