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Structure of the Surface Layers of Metastable Austenitic Stainless Steel Nitrided in Electron Beam Plasma

  • STRUCTURE, PHASE TRANSFORMATIONS, AND DIFFUSION
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Abstract

The effect of the nitriding temperature in electron beam plasma on the structural and phase composition of the surface layers of metastable austenitic stainless steels is studied. Conversion electron Mössbauer spectroscopy shows that nitriding at 350°C results in the transition of the austenite into the α (bcc) phase by the shear mechanism in the surface layers of a plate (tenths of a micron). A nitrogen supersaturated austenite and a mixture of nitrides with a predominant configuration of three nitrogen atoms in the environment of iron are formed in layers 1–5 μm thick. Nitriding at a temperature of 500°C and above leads to nitrogen supersaturated austenite decomposition, the escape of chromium and nitrogen from the matrix into nitrides CrN, Fe4N, and FexN, and the subsequent γ → α phase transformation.

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ACKNOWLEDGMENTS

We thank B.Yu. Goloborodskii for CEMS measuriments, G.V. Samoilova and A.L. Osintseva for the preparation and the heat treatment of the samples, and A.S. Mamaeva for nitriding. This work was performed under the state assignment of the Federal Agency for Scientific Organizations of Russia (themes “Structure” АААА-А18-118020190116-6 and “Flux” АААА-А18-118020190112-8) and supported in part by the Russian Foundation for Basic Research (project no. 18-03-00216).

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Authors and Affiliations

  1. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 620108, Ekaterinburg, Russia

    V. A. Shabashov, K. A. Kozlov, A. V. Makarov & V. I. Voronin

  2. Institute of Electrophysics, Ural Branch, Russian Academy of Sciences, 620016, Ekaterinburg, Russia

    N. V. Gavrilov

  3. Institute of Machine Science, Ural Branch, Russian Academy of Sciences, 620049, Ekaterinburg, Russia

    A. V. Makarov

  4. Yeltsin Ural Federal University, 620002, Ekaterinburg, Russia

    A. V. Makarov & S. G. Titova

  5. Institute of Metallurgy, Ural Branch, Russian Academy of Sciences, Ekaterinburg, , 620016 , Russia

    S. G. Titova

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  1. V. A. Shabashov
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  2. N. V. Gavrilov
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  3. K. A. Kozlov
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  4. A. V. Makarov
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  5. S. G. Titova
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  6. V. I. Voronin
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Correspondence to V. A. Shabashov.

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Translated by T. Gapontseva

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Shabashov, V.A., Gavrilov, N.V., Kozlov, K.A. et al. Structure of the Surface Layers of Metastable Austenitic Stainless Steel Nitrided in Electron Beam Plasma. Phys. Metals Metallogr. 119, 755–763 (2018). https://doi.org/10.1134/S0031918X18080124

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  • DOI: https://doi.org/10.1134/S0031918X18080124

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