Irkutsk National Research Technical University, Irkutsk, Russia:

A. E. Balanovsky, Cand. Eng., Associate Prof., Head of the Dept. of Materials Science, Welding and Additive Technologies, e-mail: fuco.64@mail.ru
E. A. Guseva, Cand. Eng., Associate Prof., Dept. of Materials Science, Welding and Additive Technologies, e-mail: el.guseva@rambler.ru
M. V. Konstantinova, Cand. Eng., Associate Prof., Dept. of Materials Science, Welding and Additive Technologies, e-mail: mavikonst@mail.ru

Moscow State University of Civil Engineering, Moscow, Russia:
Yu. I. Karlina, Cand. Eng., Researcher, e-mail: karlinigor@mail.ru

Comprehensive studies of manganese steel were carried out using modern methods of metallographic analysis. The structure and phase composition of the alloys have been studied. The microstructure of austenite grains of specimens heated to temperatures of 920–1100 °C with scattered carbide particles both in the bulk of the grain and along the grain boundaries is presented. Shown are micrographs of the steel surface after quenching. The results of structural studies have shown that, against the background of the austenitic structure, small carbide inclusions are observed located along the grain boundaries, which leads to a decrease in the strength properties of the metal. The analysis of electron microscopy data showed the presence after hardening in the structure of the 110G13L steel sample of formed special twin boundaries Σ3 60° <111>, the concentration of which is 0.813 %. The results obtained make it possible, under real production conditions, to correct the heat treatment modes of 110G13L steel castings. The hardening temperature in the production condition can be reduced by at least 50–90 °C, which will save energy.

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