Email this article Digital measurements of non-metallic inclusions in steel
- Authors: Stukalova N.A.1, Kodirov D.F.1, Alekseev V.I.1, Sokolovskaya E.A.1, Rodionova I.G.2
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Affiliations:
- University of Science and Technology MISIS
- State Research Center FSUE I.P. Bardin Central Research Institute of Ferrous Metallurgy
- Issue: No 1 (2024)
- Pages: 95-103
- Section: Articles
- URL: https://vektornaukitech.ru/jour/article/view/911
- DOI: https://doi.org/10.18323/2782-4039-2024-1-67-9
- ID: 911
Cite item
Abstract
The experience of many-year research has shown that optimizing the steel chemical composition and microstructural characteristics, as well as reducing its contamination with non-metallic inclusions (NMI), it is possible to significantly increase the corrosion resistance of oilfield pipeline steels and increase the time of their trouble-free operation. The influence of complex NMIs on the steel corrosion resistance is determined by both the chemical composition of NMIs and their quantitative ratios. Therefore, obtaining metal products of the required quality is possible only when using the “control by structure” principle. In the work, based on the analysis of brightness fields of images (on a sample scale) in 256 shades of gray, the authors proposed digital, metrologically supported procedures for measuring the NMI heterogeneity of low-carbon oilfield steels: eliminating the heterogeneity of field illumination, justifying the criteria for binarization and noise filtering. For low-carbon steels of various types of melting, the authors identified the key role of dispersed non-metallic inclusions ranging in size from 5–10 μm2 to 2 nm2 in the formation of the corrosion resistance of steels. This may explain why, in some cases, there is no interrelation between the corrosion rate and the fracture resistance of steels, the formation of which is determined by larger particles. When representing the NMI as a set of random points on the plane, the distribution of distances between the nearest ones is estimated based on Voronoi polyhedra statistics. The study shows that an increase in the kurtosis coefficient of distributions of polyhedra areas is accompanied by an increase in the corrosion rate of the steels under study. This indicates the negative impact of heterogeneity in the arrangement of dispersed NMIs on the corrosion resistance of steels.
About the authors
Natalia A. Stukalova
University of Science and Technology MISIS
Email: stukalova-n@mail.ru
ORCID iD: 0009-0007-3455-4457
postgraduate student
Russian Federation, 119049, Russia, Moscow, Leninsky Prospekt, 4, block 1Davronjon F. Kodirov
University of Science and Technology MISIS
Author for correspondence.
Email: DFKodirov@yandex.ru
ORCID iD: 0009-0003-5380-5558
postgraduate student
Russian Federation, 119049, Russia, Moscow, Leninsky Prospekt, 4, block 1Valeriy I. Alekseev
University of Science and Technology MISIS
Email: alval7@yandex.ru
postgraduate student
Russian Federation, 119049, Russia, Moscow, Leninsky Prospekt, 4, block 1Elina A. Sokolovskaya
University of Science and Technology MISIS
Email: Sokolovskaya@misis.ru
ORCID iD: 0000-0001-9381-9223
PhD (Engineering), Associate Professor, assistant professor of Chair of Metal Science and Physics of Strength
Russian Federation, 119049, Russia, Moscow, Leninsky Prospekt, 4, block 1Irina G. Rodionova
State Research Center FSUE I.P. Bardin Central Research Institute of Ferrous Metallurgy
Email: igrodi@mail.ru
ORCID iD: 0000-0003-4201-4665
Doctor of Sciences (Engineering), Associate Professor, Deputy Director of the Scientific Center for Physical and Chemical Fundamentals and Technologies of Metallurgy
Russian Federation, 105005, Russia, Moscow, Radio Street, 23/9, block 1References
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