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Russian Physics Journal

, Volume 62, Issue 4, pp 698–704 | Cite as

Microstructure and Mechanical Properties of Austenitic Steel EK-164 After Thermomechanical Treatments

  • S. A. AkkuzinEmail author
  • I. Yu. Litovchenko
  • A. N. Tymentsev
  • V. M. Chernov
Article
  • 8 Downloads

The influence of thermomechanical treatments, including low-temperature and subsequent warm deformation, on the microstructure and mechanical properties of an austenitic reactor steel (Russian Grade EK-164) is investigated. It is shown that low-temperature plastic deformation (after cooling in liquid nitrogen) gives rise to the formation of a high density of microtwins. In the course of subsequent warm deformation (at T = 600 or 700° C) the localized deformation bands, having an internal fragmented nano-sized structure, propagate in the microtwin structure. It is demonstrated that these microstructure characteristics ensure a multiple (by 3–5 factors) yield strength increase at 20 and 650°C.

Keywords

austenitic reactor steel EK-164 thermomechanical treatmment mechanical properties transmission electron microscopy twinning strain localization 

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • S. A. Akkuzin
    • 1
    • 2
    Email author
  • I. Yu. Litovchenko
    • 1
    • 2
  • A. N. Tymentsev
    • 1
    • 2
  • V. M. Chernov
    • 3
  1. 1.National Research Tomsk State UniversityTomskRussia
  2. 2.Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of SciencesTomskRussia
  3. 3.AO Bochvar High-Technology Research Institute of Inorganic MaterialsMoscowRussia

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