The Influence of Modification on Crystal Lattice Stability of Austenite in Stainless Steel
- Authors: Kurzina I.A.1, Potekaev A.I.1,2, Popova N.A.1,3,4, Nikonenko E.L.1,3,5, Dement T.V.3, Klopotov A.A.1,3, Kulagina V.V.2,6, Klimenov V.A.5
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Affiliations:
- National Research Tomsk State University
- V. D. Kuznetsov Siberian Physical Technical Institute at Tomsk State University
- Tomsk State Architecture and Building University
- Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences
- National Research Tomsk Polytechnic University
- Siberian State Medical University
- Issue: Vol 61, No 4 (2018)
- Pages: 715-721
- Section: Condensed-State Physics
- URL: https://ogarev-online.ru/1064-8887/article/view/240454
- DOI: https://doi.org/10.1007/s11182-018-1452-0
- ID: 240454
Cite item
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.
About the authors
I. A. Kurzina
National Research Tomsk State University
Author for correspondence.
Email: kurzina99@mail.ru
Russian Federation, Tomsk
A. I. Potekaev
National Research Tomsk State University; V. D. Kuznetsov Siberian Physical Technical Institute at Tomsk State University
Email: kurzina99@mail.ru
Russian Federation, Tomsk; Tomsk
N. A. Popova
National Research Tomsk State University; Tomsk State Architecture and Building University; Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences
Email: kurzina99@mail.ru
Russian Federation, Tomsk; Tomsk; Tomsk
E. L. Nikonenko
National Research Tomsk State University; Tomsk State Architecture and Building University; National Research Tomsk Polytechnic University
Email: kurzina99@mail.ru
Russian Federation, Tomsk; Tomsk; Tomsk
T. V. Dement
Tomsk State Architecture and Building University
Email: kurzina99@mail.ru
Russian Federation, Tomsk
A. A. Klopotov
National Research Tomsk State University; Tomsk State Architecture and Building University
Email: kurzina99@mail.ru
Russian Federation, Tomsk; Tomsk
V. V. Kulagina
V. D. Kuznetsov Siberian Physical Technical Institute at Tomsk State University; Siberian State Medical University
Email: kurzina99@mail.ru
Russian Federation, Tomsk; Tomsk
V. A. Klimenov
National Research Tomsk Polytechnic University
Email: kurzina99@mail.ru
Russian Federation, Tomsk
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