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.
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Original Russian Text © V.V. Sagaradze, O.V. Fomina, T.V. Vikhareva, N.V. Kataeva, I.G. Kabanova, V.A. Zavalishin, 2018, published in Fizika Metallov i Metallovedenie, 2018, Vol. 119, No. 3, pp. 296–302.
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Sagaradze, V.V., Fomina, O.V., Vikhareva, T.V. et al. Features of the Decomposition of Delta Ferrite in Nitrogen-Containing Austenitic Steels. Phys. Metals Metallogr. 119, 282–288 (2018). https://doi.org/10.1134/S0031918X18030110
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DOI: https://doi.org/10.1134/S0031918X18030110