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


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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.

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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