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Structural and phase transformations and micromechanical properties of the high-nitrogen austenitic steel deformed by shear under pressure

  • Structure, Phase Transformations, and Diffusion
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Abstract

Using transmission electron microscopy, X-ray diffraction analysis, Mössbauer spectroscopy, microdurometry, and microindentation, the effect of large plastic deformations (through shear under pressure in Bridgman anvils) on the structure, phase composition, and micromechanical properties of high-nitrogen (1.24 wt % N) 08Kh22GA1.24 steel has been investigated. The steel was obtained by the casting method with counterpressure of nitrogen and was subjected to different heat treatments (quenching from1180°С, aging at 450 and 550°С) that form an austenitic (FCC) structure of the metallic matrix with chromium nitrides. It has been established that deformation by shear under pressure at room temperature results in the dispersion and deformation-induced partial dissolution of primary nitrides Cr2N in quenched and aged steel and in the complete (after aging at 450°С) and partial (after aging at 550°С) dissolution of secondary nitrides CrN. It has been noted that, for aged steel that contains finely dispersed secondary chromium nitrides upon shear deformation, as compared to the quenched state, the dispersion of the austenitic structure (down to nano- and submicrocrystalline states) is more intense and the enhancement in the microhardness and resistance to elastic–plastic deformations upon contact loading is more effective.

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Authors and Affiliations

  1. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Ekaterinburg, 620990, Russia

    A. V. Makarov, S. N. Luchko, V. A. Shabashov, E. G. Volkova, A. E. Zamatovskii, A. V. Litvinov & V. V. Sagaradze

  2. Institute of Machine Science, Ural Branch, Russian Academy of Sciences, ul. Komsomol’skaya 34, Ekaterinburg, 620049, Russia

    A. L. Osintseva

Authors
  1. A. V. Makarov
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  2. S. N. Luchko
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  3. V. A. Shabashov
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  4. E. G. Volkova
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  5. A. L. Osintseva
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  6. A. E. Zamatovskii
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  7. A. V. Litvinov
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  8. V. V. Sagaradze
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Correspondence to A. V. Makarov.

Additional information

Original Russian Text © A.V. Makarov, S.N. Luchko, V.A. Shabashov, E.G. Volkova, A.L. Osintseva, A.E. Zamatovskii, A.V. Litvinov, V.V. Sagaradze, 2017, published in Fizika Metallov i Metallovedenie, 2017, Vol. 118, No. 1, pp. 55–68.

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Makarov, A.V., Luchko, S.N., Shabashov, V.A. et al. Structural and phase transformations and micromechanical properties of the high-nitrogen austenitic steel deformed by shear under pressure. Phys. Metals Metallogr. 118, 52–64 (2017). https://doi.org/10.1134/S0031918X17010045

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