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


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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.

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S. Akkuzin

National Research Tomsk State University; Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences

编辑信件的主要联系方式.
Email: s.a.akkuzin@gmail.com
俄罗斯联邦, Tomsk; Tomsk

I. Litovchenko

National Research Tomsk State University; Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences

Email: s.a.akkuzin@gmail.com
俄罗斯联邦, Tomsk; Tomsk

A. Tymentsev

National Research Tomsk State University; Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences

Email: s.a.akkuzin@gmail.com
俄罗斯联邦, Tomsk; Tomsk

V. Chernov

AO Bochvar High-Technology Research Institute of Inorganic Materials

Email: s.a.akkuzin@gmail.com
俄罗斯联邦, Moscow

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