Formation of the Grain Boundary Structure of Low-Alloyed Steels in the Process of Plastic Deformation

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Abstract: In this work, transmission electron microscopy was used to study the effect of variable factors (ε, τ, t) as well as that of relative number of special, in the CSL (coincidence site lattice) concept, low-energy boundaries, in the ferritic and martensitic components of low-carbon steels. The conditions for the appearance of the first large-angle boundaries in the polygonized hotdeformed matrix are determined. CSL boundaries of Σ 3, 9, 11, 33 types, which increase the plasticity index of the products are found in the ferrite and martensit Establishment of optimal thermoplastic deformation – the change in the configuration of the grain boundaries, the formation of small-angle boundaries and the interaction of large-angle ones with special boundaries in accordance with the von Neumann-Mullins theory. After the heat treatment, the structure of 10ХФТБч type steel (Standard of Ukraine) consists of ferritic grains, a small amount of perlite and spheroidized special carbides.

Authors: Sergey Shejko, George Sukhomlin, Valerii Mishchenko, Vadim Shalomeev, and Valentina Tretiak

Keywords: plastic deformation, grain boundary structure, polygonization, phase composition, low-alloyed steel, special grain boundaries

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8 pages

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