Physics of Metals and Metallography

, Volume 119, Issue 3, pp 282–288 | Cite as

Features of the Decomposition of Delta Ferrite in Nitrogen-Containing Austenitic Steels

  • V. V. Sagaradze
  • O. V. Fomina
  • T. V. Vikhareva
  • N. V. Kataeva
  • I. G. Kabanova
  • V. A. Zavalishin
Structure, Phase Transformations, and Diffusion


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.


nitrogen-containing austenitic steel delta ferrite sigma phase electron microscopy magnetometry 


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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • V. V. Sagaradze
    • 1
  • O. V. Fomina
    • 2
  • T. V. Vikhareva
    • 2
  • N. V. Kataeva
    • 1
  • I. G. Kabanova
    • 1
  • V. A. Zavalishin
    • 1
  1. 1.Institute of Metal Physics, Ural BranchRussian Academy of SciencesEkaterinburgRussia
  2. 2.Kurchatov Institute National Research Center – Prometei Central Research Institute of Structural MaterialsSt. PetersburgRussia

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