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

Journal Article · Wed Aug 15 00:00:00 EDT 2018 · Russian Physics Journal

DOI:https://doi.org/10.1007/S11182-018-1452-0· OSTI ID:22869697

Kulagina, V. V. ^[1]

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1. V. D. Kuznetsov Siberian Physical Technical Institute at Tomsk State University (Russian Federation)

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 TiO{sub 2}, ZrO{sub 2} powders and Na{sub 3}AlF{sub 6} 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.

• OSTI ID: 22869697
• Journal Information: Russian Physics Journal, Vol. 61, Issue 4; Other Information: Copyright (c) 2018 Springer Science+Business Media, LLC, part of Springer Nature; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); ISSN 1064-8887
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM FLUORIDES
AUSTENITE
AUSTENITIC STEELS
CHROMIUM
CRYSTAL LATTICES
ELECTRON DIFFRACTION
EXPERIMENTAL DATA
MARTENSITE
MICROSTRUCTURE
SODIUM FLUORIDES
SOLID SOLUTIONS
STAINLESS STEELS
TITANIUM OXIDES
TWINNING
VANADIUM
X-RAY DIFFRACTION
ZIRCONIUM OXIDES