Byelorussian State Technical University (Minsk, Belarus):

A. N. Chichko, O. A. Sachek, V. F. Sobolev

Byelorussian Steel Works (BMZ) — Management Company of “Byelorussian Metallurgical Company” Holding, Steel Cord and Wire Products Research Centre (Zhlobin, Belarus):

A. V. Vedeneev
E-mail: metsc@bmz.gomel.by

The paper describes an algorithm for the mathematical description of microstructures of pearlitic steels. The purpose of this work is the development of a method for mathematical description of the microstructures in pearlitic steels for their quantification. It is proves the fact that the mathematical models of microstructures, developed using the frequency distribution of eutectoid colonies in pearlitic steels depending on interlamellar distances, allow estimating the degree of heterogeneity of a microstructure. It is known that microstructures of pearlitic steels, obtained under non-equilibrium conditions, consist of eutectoid colonies formed after decomposition of austenite and incoherently distributed in the plane of the section. At the same time, in different parts of microstructure, the sizes of interlamellar distances of “ferrite-cementite” system can differ by several times. In these circumstances, establishment of relationships between the characteristics of microstructure and steel properties is virtually impossible, if using the traditional approaches based on qualitative analysis of microstructure. Simple averaging of microstructure parameters equalizes structural features of eutectoid colonies and the study of relationship between the properties of steel and its microstructure parameters becomes even more complicated. At the same time, today’s computer-based image processing techniques open up new possibilities for analyzing the relationship “structure-properties”.

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