Actual Problems in Machine Building 2021 Vol.8 N1-2

Актуальные проблемы в машиностроении. Том 8. № 1-2. 2021 Материаловедение в машиностроении ____________________________________________________________________ 71 21. Brian S. E., Dunn G. Applied multivariate data analysis. – London: Arnold; New York: Oxford University Press, 2001. – 342 с. 22. Афанасьев В.К. Водородный механизм образования выделений графита в чугуне // Литейное производство. – 2014. – № 1. – С. 8–13. EFFECT OF MELT TREATMENT AND CYCLIC DEFORMATION ON BLAST FURNACE IRON MICROSTRUCTURE Afanasyev V.K. 1 , D.Sc. (Engineering), Professor, e-mail: in_afanaseva@mail.ru Popova M.V. 1 , D.Sc. (Engineering), Professor, e-mail: m.popova@rdtc.ru Dolgova S.V. 1 , junior researcher, e-mail: sv_dolgov@mail.ru Sagalakova M.M. 2 , Ph.D. (Engineering), Associate Professor, e-mail: m_sagalakova@mail.ru Chernysh A.P. 3 , Ph.D. (Engineering), Associate Professor, Director, e-mail: tmrm@mail.ru 1 Siberian State Industrial University, 42 Kirov st., Novokuznetsk, 654007, Russian Federation 2 Khakass Technical Institute of the Branch of Siberian Federal University, 27 Shchetinkina st., Abakan, 655017, Russian Federation 3 Kemerovo Research Institute of the Branch of SFNCA RAS, 47 Central st., Novostrojka village, Kemerovo district, 650510, Russian Federation Abstract This paper explores the microstructure of blast furnace pig iron after melt treatment and subsequent cyclic deformation. Melt treatment was carried out with graphite blocks, fluoroplastic, as well as by cyclic temperature change. The thermocyclic treatment of the melt in the range of 1100-1200 ° C has been found to allow to completely suppress the graphitization process in blast furnace iron and obtain a ledeburite structure. It has been shown that hot thermocyclic deformation is possible for cast iron without graphite emissions. High-quality deformed blanks were obtained in the form of plates with thickness from 5 to 0.5 mm. Effects of cyclic forging on microstructure of plates of different thickness from cast iron without graphite discharge have been investigated. Plastic deformation has been found to contribute to the dispersion of structural components and their line arrangement. Keywords Blast furnace iron, microstructure, graphite, ledeburite, melt treatment, plastic deformation, forging.