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Non-metallic inclusions in different zones of crystallization of E90KhAF rail steel

Izvestiya Ferrous Metallurgy, ISSN: 2410-2091, Vol: 64, Issue: 2, Page: 135-142
2021
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Article Description

Metallographic and X-ray studies of continuously cast billets of E90KhAF rail steel have been carried out. We have established the regularities of non-metallic inclusions distribution over the crystallization zones before and after billets deformation. It was revealed that in crustal zone the main non-metallic inclusions are point oxides, aluminum nitrides, iron silicates (FeO SiO2 ) and alumosilicates (Al2O3 SiO2 ). They were identified in the zone of columnar crystals. In central zone of the billet, manganese sulfides (MnS), manganese silicates (MnO SiO2 ), alumosilicates (Al2O3 SiO2 ), iron silicates (FeO SiO2 ), and point oxides were found. It has been determined that concentration and size of nonmetallic inclusions tend to increase from the surface to central zone of continuously cast billets, which is consistent with generally accepted ideas about mechanisms of billet formation during crystallization. The mechanism of deformation of two-phase silicate non-metallic inclusions and their influence on quality of rail products was disclosed. It is shown that inhomogeneous deformability of complex silicate inclusions aggravates their harmful effect on rail products quality. In this case, additional stresses appear in addition to inclusion-matrix deformation and contact stresses existing at interphase boundaries. This pattern also holds for non-deformed silicate inclusions. Such a distribution of inclusions in the billets volume somewhat reduces their negative effect on rails quality, since near-contact layers of the billet undergo more intense deformation during rolling, and as the axial zone of a billet is approached, deformation rate decreases.

Bibliographic Details

Artem S. Simachev; Tat'yana N. Oskolkova; Aleksandr A. Umanskii; Aleksei V. Golovatenko

National University of Science and Technology MISiS

Materials Science

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