The Influence of Modification on Crystal Lattice Stability of Austenite in Stainless Steel

I. A. Kurzina, A. I. Potekaev, N. A. Popova, E. L. Nikonenko, T. V. Dement, A. A. Klopotov, V. V. Kulagina, V. A. Klimenov

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Abstract

Using the methods of electron diffraction microscopy and X-ray diffraction analysis, the influence of alloying of the austenitic steel, Grade 110H13, with chromium and vanadium, as well as high-melting, ultrafine-grained TiO2, ZrO2 powders and Na3AlF6 cryolite on its structural-phase state and microstructure is investigated. It is shown that the matrix of non-modified steel is completely austenitic and consists of an iron-based solid solution and the interstitial (C, N, O and other) and substitutional (Cr, V and other) atoms simultaneously. Alloying with chromium and vanadium changes neither its phase composition nor defect structure, while alloy modification results in qualitatively new structural features: γ → ε-transformation, high-intensity microtwinning, defect structure changes, and a sharp increase in the scalar dislocation density. The features of the deformation-induced microtwinning and ε-martensite plates identified in the modified steel promote revealing additional microtwin systems in the matrix γ-phase, which result in structural changes making it possible to classify it as a γ′-phase. It is found out that an introduction of modifying additions gives rise to the following sequence of structural-phase transformations: γ→γ′→(γ′ +ε). The experimental data obtained demonstrate that as a result of modification the crystal lattice transits into a low-stability state. This transition is accompanied by marked structural-phase changes consisting in the formation of several microtwin systems and γ → ε-transformation. These structural-phase changes in the modified steel are due to the crystal-lattice transition into the low-stability state, followed by new structural-phase alterations.

Original languageEnglish
Pages (from-to)715-721
Number of pages7
JournalRussian Physics Journal
Volume61
Issue number4
DOIs
Publication statusPublished - 1 Aug 2018

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Keywords

  • Hadfield steel
  • high-melting utrafine-grained powders
  • low-stability states
  • microstructure
  • modification
  • structuralphase transformations

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Kurzina, I. A., Potekaev, A. I., Popova, N. A., Nikonenko, E. L., Dement, T. V., Klopotov, A. A., Kulagina, V. V., & Klimenov, V. A. (2018). The Influence of Modification on Crystal Lattice Stability of Austenite in Stainless Steel. Russian Physics Journal, 61(4), 715-721. https://doi.org/10.1007/s11182-018-1452-0