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Features of Phase Transformations of Low-activation 12%-Chromium Ferritic-Martensitic Steel Ek-181

Authors
  • Polekhina, N. A.1, 2
  • Litovchenko, I. Yu.1, 2
  • Almaeva, K.V.1, 2
  • Bulina, N. V.3
  • Korchagin, M. A.3
  • Tyumentsev, A. N.1, 2
  • Chernov, V. M.4
  • Leontyeva-Smirnova, M.V.4
  • 1 Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia , Tomsk (Russia)
  • 2 National Research Tomsk State University, Tomsk, Russia , Tomsk (Russia)
  • 3 Institute of Solid State Chemistry and Mechanochemistry of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia , Novosibirsk (Russia)
  • 4 SC A. A. Bochvar High-Technology Research Institute of Inorganic Materials, Moscow, Russia , Moscow (Russia)
Type
Published Article
Journal
Russian Physics Journal
Publisher
Springer US
Publication Date
Apr 15, 2020
Volume
62
Issue
12
Pages
2314–2318
Identifiers
DOI: 10.1007/s11182-020-01982-z
Source
Springer Nature
Keywords
License
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Abstract

An investigation of the features of structural-phase transformations during heating and cooling of the lowactivation 12%-chromium ferritic-martensitic steel EK-181 (Fe–12Cr–2W–V–Ta–B) is performed in the range of temperatures from 30 to 1100°C by the methods of high-temperature X-ray diffraction analysis (XRD) in situ. The critical points of an (α →γ) - transformation (Ас1 ≈ 850°С, Ас3 ≈ 950°С) in the course of steel heating and the temperature interval (910–890°C) of the diffusion-induced transformation of the austenite →α-ferrite type under cooling are determined. It is shown that the position of these points changes depending on the method (XRD or differential scanning calorimetry) of their identification, which is attributed to the differences in their heating-cooling rates. During heating in the range of temperatures of 830–875°C, a significant increase in the volume fraction of М23С6 carbides is observed. Further temperature increase up to 1000–1100°C leads to their complete dissolution. In the course of cooling of the steel specimens from 1100 to 30°C, there is no carbide particle precipitation.

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