Kononenko Anna Andreevna, PhD (Engin.), Senior Researcher, Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107; e-mail:perlit@ua.fm, a_kononenko@inbox.ru ORCID 0000-0001-7446-4105
Puchikov Alexander Vladimirovich, Senior Researcher, Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107
Kuksa Oleg Volodimirovich, PhD (Engin.), Researcher, Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academican Starodubova square, 1, Dnipro, Ukraine, 49107;
Snigura Iryna Romanivna, Junior Researcher, Iron and Steel Institute named after Z.I. Nekrasov of the NAS of Ukraine, Academic square Starodubova, 1, Dnipro, Ukraine, 49107

Physical and chemical models for expert evaluation of mechanical properties of structural steels

Abstract. The aim of the study is to develop an adapted methodology for
assessing the influence of the chemical composition on the properties of
multicomponent steels and finished rolled products. An approach to predicting
the mechanical properties of structural steels with regard to heat treatment
parameters, based on the concept of a directed chemical bond in the description
of interatomic interaction in the melt, is presented. The physico-chemical
models of the structure of the melts, which interconnect their composition,
structure, and properties, were developed in the Iron and Steel Institute of NAS
Ukraine. The representation of the element-by-element composition of
multicomponent steels in the integral parameters of the interatomic interaction
makes it possible to reduce the parametricity of the models. The role of various
pairing interactions of alloying, microalloying and impurity elements in the
formation of properties of steels and alloys was evaluated. A factor analysis has
been carried out, the chemical composition of the steel has been structured into
various subsystems. It is shown that the most significant subsystems are the
matrix m (C, Si, Mn) and microalloying ml (Cr, Mo, V, Ni, Ti, Nb). For two
samples of structural steels with significant technological differences and
features (1-st group – low alloyed steels: St3sp, VSt3sp, VMSt3sp; 2-nd group:
09Г2ФБ, 10ХСНД, 15ХСНД, 14Г2САФ, 14Г2АФ, 16Г2АФ) dependencies of
the type are obtained: σВ (σ0,2, δ5) = f (interatomic interaction parameters, Vcool).
2
«Фундаментальные и прикладные проблемы черной металлургии. – 2018. – Вып.32
«Fundamental and applied problems of ferrous metallurgy». – 2018. – Collection 32
«Fundamental’nye i prikladnye problemy černoj metallurgii». – 2018. – Vypusk 32
It is shown that the most important parameters for calculating the σB, σ0.2
and δ5 matrix subsystem m are the integral parameters of the interatomic
interaction d and Z
Y
, dm and tgαm, and for the microalloying subsystem ml – Z
Y
ml
and dml, as well as the cooling rate Vcool for both subsystems. The developed
semi-empirical models are recommended for expert assessment of the
mechanical properties of structural steels and for use in automated control
systems and automated process control systems.
Keywords: structural steels, mechanical properties, predictive models,
interatomic interaction parameters, heat treatment parameters
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