Specific features of structural-phase transformations and hardening during shear deformation under pressure of high-nitrogen steel with austenitic-ferritic structure of metal matrix

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Abstract

The increased anticorrosive, strength, tribological, and physical characteristics are the specific features of steels with high nitrogen content. Searching for the ways to strengthen high-nitrogen steels is a promising area of contemporary metal science. Heat treatment is one of the methods of hardening nitrogen steels as a result of precipitation hardening with nitride particles. The authors studied the influence of short-term high-temperature aging and large plastic deformations implemented by shear under the pressure of 8 GPa (SP method) on Bridgman anvils (three revolutions of anvils with the rotation velocity of 0.3 rev/min) at room temperature on the structural-phase transformations and micromechanical properties of the 08H22GA1.24 high-nitrogen steel with the mixed γ (austenite) + a (ferrite) metal matrix structure. The study identified that aging (0.5 h) at the temperature of 650 °С of steel quenched at the temperature from 1180 °С causes the formation of the mixed austenitic-ferritic structure of metal matrix in the ratio of 50 vol. % of g and 50 vol. % of α and the release of extended secondary Cr2N chromium nitrides, together with ferrite interlayers forming the areas with the pearlite-like structure. These areas cause the increased microhardness of steel with the austenitic-ferritic matrix structure (385±8 HV 0.025) compared to one of steel aged at the temperature of 550 °С (0.5 h) and having an austenitic matrix structure strengthened with secondary CrN nitrides (364±8 HV 0.025). The SP deformation of steel aged at the temperature of 650 °С (0.5 h) with the initial g+a+Cr2N structure leads to g→aʹ transformation and the formation of submicro- and nanocrystalline structures. It causes the effective strength improvement of steel (up to 900±29 HV 0.025) and the growth of resistance to elastoplastic deformation compared to aged at the temperature of 550 °C (0.5 h) condition.

About the authors

Sergey N. Luchko

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

Author for correspondence.
Email: serojaluchko@gmail.com
ORCID iD: 0000-0002-2368-0913

junior researcher of Laboratory of Mechanical Properties

Russian Federation

Aleksey V. Makarov

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

Email: fake@neicon.ru
ORCID iD: 0000-0002-2228-0643

Corresponding member of RAS, Doctor of Sciences (Engineering), Head of Department of Material Science and Laboratory of Mechanical Properties

Russian Federation

Elena G. Volkova

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

Email: fake@neicon.ru
ORCID iD: 0000-0003-4958-3027

PhD (Physics and Mathematics), senior researcher of Laboratory of Mechanical Properties

Russian Federation

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