Розробка хімічного складу та вдосконалення технології виробництва для підвищення експлуатаційної надійності і довговічності залізничної металопродукції

• Date: 2023
• Main Authors: Бабаченко, О.І., Кононенко, Г.А., Дьоміна, К.Г.
• Format: Article
• Language: Ukrainian
• Published: Physico-technological Institute of Metals and Alloys 2023
• Subjects: термічна обробка прокату; масове виробництво; нові сталі; залізничні колеса; залізничні осі; залізничні рейки
• Online Access: https://www.metalsandcasting.com/index.php/mcu/article/view/174
• Journal Title: Metal and Casting of Ukraine

The development of theoretical foundations and practical development of process parameters and equipment for heat treatment of rolled products in the process of mass production is the main area of work of the department of problems of deformation-heat treatment of structural steels. Division under the direction of K.F. Starodubov was founded at the Iron and Steel Institute of Z.I. Nekrasov of the NAS of Ukraine, defined as the leading organization for the production and quality of metal products for rail transport. In recent years, the department has developed new steels for the elements of freight cars of a new generation and the technological process of their heat treatment, which provides the possibility of producing highstrength cold-resistant steel without the use of expensive alloying elements. Steel wheels with various alloying systems for various operating conditions have been developed for railway wheels. The developed heat treatment parameters make it possible to achieve a given set of properties. The positive effect of increasing the degree of deformation in the central volumes of the rim metal on the fracture toughness K1s has been scientifically substantiated and confirmed. A model for calculating temperature fields in the process of accelerated cooling of a rim of a railway wheel has been created. For the formation of a homogeneous structure along the crosssection of railway wheels, rational regimes of thermal hardening depending on the chemical composition of steel are justified. Using the method of assessing the deformed state of the metal, the features of the dendritic structure of the initial continuously cast billet Ø 470 mm for the production of railway axles and axial billets Ø 380 and 220 mm in the conditions of OJSSC “INTERPIPE NTZ” were investigated. The degree of deformation study of metal over the cross section of axial billets was determined and recommendations were developed to increase the fatigue strength of railway axles manufactured by OSSC "INTERPIPE NTZ". In recent years, work is underway to improve the chemical composition and heat treatment technology of domesticmade railway rails.