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Registration Number

0225U004229, (0123U102650) , R & D reports

Title

New materials with a gradient nanostructure for load-bearing structures of the increased reliability and human security under special conditions

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Розробка нової сталі і її обробки для отримання градієнтної нанострукрури з підвищеними властивостями.Узагальнення результатів роботи за проєктом .

Head

Brykov Mykhailo M., Доктор технічних наук

Registration Date

26-11-2025

Organization

Zaporizhzhya Polytechnic National University

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The aim of the project is to achieve the highest possible set of strength properties for non-alloy or low-alloy (up to 5 wt.% Alloying elements in total) steels applicable in mass production, including the creation of gradient nanostructures

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The object of research is processes of thermal treatment and structure formation of unalloyed and low-alloy steels. The purpose of the work is to develop new steel and its processing to obtain a gradient nanostructure with enhanced properties. Research methods are as follows: heat treatment of low-alloy steels, determination of mechanical properties of heat-treated samples, study of microstructure and fracture surfaces of samples using optical and scanning electron microscopy, X-ray diffractometry, measurement of hardness and microhardness, computer analysis of microstructure images, modeling of properties of high-strength steels. The composition and properties of high-strength steels in a wide range of carbon content were modeled. For every steel with a fixed carbon content, the content of alloying elements was determined, which is necessary to maintain the martensite start temperature at a given level. The composition of a new steel of the silicon-manganese alloying system was developed. The steel is suitable for heat treatment in any of the main modes: quenching with tempering, isothermal treatment to bainite, quenching & tempering. The optimal mode of isothermal treatment of the new steel was determined, tests were conducted and information on mechanical properties was obtained. The structure of heat-treated samples was studied. The weldability of heat-treated samples was studied. Mechanical tests of welded samples were carried out and the possibility of obtaining high-quality welded joints was proven.

Product Description

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Vasyl V. Girzhon
Oleksii V. Yefremenko
Oleksandr V. Klymov
Mykhailo M. Brykov
Oleksii Y. Kapustian

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2025-11-26