THE STRUCTURE, PHASE COMPOSITION AND MICROMECHANICAL CHARACTERISTICS OF HIGH-NITROGEN AUSTENITIC STEEL AFTER HIGH-TEMPERATURE AGEING AND DEFORMATION BY SHEAR UNDER PRESSURE


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Abstract

The development of high-nitrogen sparingly alloyed steels is one of the advanced directions in creating high-strength, wear- and corrosion-resistant materials. Current paper studies the influence of large plastic deformations implemented by the method of shear under pressure (SP) at the room temperature on the structure evolution (using the methods of electron transmission microscopy and X-ray diffraction analysis) and the feasibilities of hardening 08Kh22GA1.24 high-nitrogen (1.24 wt. % N) austenitic steel with the initial α-BCC structure of metal matrix. Steel was produced using the method of nitrogen counterpressure casting and was hardened at the temperature of 1180 °С with the following high-temperature ageing at 650 °С for 2.5 hours forming the ferrite (α-BCC) structure with thin extended secondary Cr2N chromium nitrides. SP deformation of aged at 650 °С steel with the initial ferrite-nitride structure causes the subsolution of chromium nitrides and the formation of the most homogeneous and dispersed nano- and sub-microcrystalline α-phase structure compared with the γ+(15–20 vol. %)α structures formed by SP method in the aged at 550 °С and in the hardened steel with the initial austenitic matrix structure. Using the restituted-indentation method for microhardness measuring, it is determined that SP deformation of aged at 650 °С steel with the perlite-like ferrite-nitride structure leads to more effective hardening (up to 930 HV0.025) than of steel with the initial austenitic-nitride structure after quenching, quenching and ageing at 550 °С (hardness growth at SP deformation is up to 830 and 889 HV0.025 respectively). According to the microindentation data, after annealing at 650 °С and SP deformation, steel has the increased resistance to the elastic-plastic deformation upon the mechanical contact loading as well.

About the authors

Aleksey Viktorovich Makarov

M.N. Mikheev Institute of Metal Physics of Ural Branch of the Russian Academy of Sciences, Yekaterinburg
Institute of Engineering Science of Ural Branch of the Russian Academy of Sciences, Yekaterinburg

Author for correspondence.
Email: av-mak@yandex.ru

Doctor of Sciences (Engineering), Head of Department of Materials Science and Laboratory of Mechanical Properties

Россия

Sergey Nikolaevich Luchko

M.N. Mikheev Institute of Metal Physics of Ural Branch of the Russian Academy of Sciences, Yekaterinburg

Email: serojaluchko@gmail.com

postgraduate student

Россия

Elena Georgievna Volkova

M.N. Mikheev Institute of Metal Physics of Ural Branch of the Russian Academy of Sciences, Yekaterinburg

Email: volkova@imp.uran.ru

PhD (Physics and Mathematics), senior researcher

Россия

Alevtina Leontievna Osintseva

Institute of Engineering Science of Ural Branch of the Russian Academy of Sciences, Yekaterinburg

Email: lkm@imach.uran.ru

PhD (Engineering), senior researcher

Россия

Anton Viktorovich Litvinov

M.N. Mikheev Institute of Metal Physics of Ural Branch of the Russian Academy of Sciences, Yekaterinburg

Email: litvinov@imp.uran.ru

PhD (Engineering), senior researcher

Россия

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