Features of the Decomposition of Delta Ferrite in Nitrogen-Containing Austenitic Steels
- Authors: Sagaradze V.V.1, Fomina O.V.2, Vikhareva T.V.2, Kataeva N.V.1, Kabanova I.G.1, Zavalishin V.A.1
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Affiliations:
- Institute of Metal Physics, Ural Branch
- Kurchatov Institute National Research Center – Prometei Central Research Institute of Structural Materials
- Issue: Vol 119, No 3 (2018)
- Pages: 282-288
- Section: Structure, Phase Transformations, and Diffusion
- URL: https://journals.rcsi.science/0031-918X/article/view/167461
- DOI: https://doi.org/10.1134/S0031918X18030110
- ID: 167461
Cite item
Abstract
Features of the decomposition of the ferromagnetic δ ferrite with the formation of nonferromagnetic constituents (γ and σ phases) at temperatures of 900–1200°C in a nitrogen-containing austenitic steel have been determined. The transformation of δ ferrite at high temperatures (1100–1200°C) occurs with the formation of Widmanstäatten austenitic crystals in the ferritic matrix. At lower temperatures (900–1000°C), the transformation of δ ferrite develops by discontinuous decomposition with the formation of colonies of alternating plates of paramagnetic γ and σ phases. In the course of formation of the nonferromagnetic state as a result of the decomposition of δ ferrite at 900–1000°C (for 1 h), a subgrain structure with an increased density of dislocations, which is typical of thermomechanical treatment, is retained in the steel previously strengthened by high-temperature deformation.
About the authors
V. V. Sagaradze
Institute of Metal Physics, Ural Branch
Author for correspondence.
Email: vsagaradze@imp.uran.ru
Russian Federation, Ekaterinburg, 620990
O. V. Fomina
Kurchatov Institute National Research Center – Prometei Central Research Institute of Structural Materials
Email: vsagaradze@imp.uran.ru
Russian Federation, St. Petersburg, 191015
T. V. Vikhareva
Kurchatov Institute National Research Center – Prometei Central Research Institute of Structural Materials
Email: vsagaradze@imp.uran.ru
Russian Federation, St. Petersburg, 191015
N. V. Kataeva
Institute of Metal Physics, Ural Branch
Email: vsagaradze@imp.uran.ru
Russian Federation, Ekaterinburg, 620990
I. G. Kabanova
Institute of Metal Physics, Ural Branch
Email: vsagaradze@imp.uran.ru
Russian Federation, Ekaterinburg, 620990
V. A. Zavalishin
Institute of Metal Physics, Ural Branch
Email: vsagaradze@imp.uran.ru
Russian Federation, Ekaterinburg, 620990