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Karasev, Andrey
Publications (10 of 21) Show all publications
Al-Saadi, M., Sandberg, F., Hulme-Smith, C., Karasev, A. & Jönsson, P. (2019). A study of the static recrystallization behaviour of cast Alloy 825 after hot-compressions. In: Journal of Physics: Conference Series: . Paper presented at 7th International Conference on Recrystallization and Grain Growth, Ghent,August 4-9, 2019. , 1270
Open this publication in new window or tab >>A study of the static recrystallization behaviour of cast Alloy 825 after hot-compressions
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2019 (English)In: Journal of Physics: Conference Series, 2019, Vol. 1270Conference paper, Published paper (Refereed)
Abstract [en]

The static recrystallization behaviour of a columnar and equiaxed Alloy 825 material was studied on a Gleeble-3800 thermo-simulator by single-hit compression experiments. Deformation temperatures of 1000-1200 °C, a strain of up to 0.8, a strain rate of 1s-1, and relaxation times of 30, 180, and 300 s were selected as the deformation conditions to investigate the effects of the deformation parameters on the SRX behaviour. Furthermore, the influences of the initial grain structures on the SRX behaviors were studied. The microstructural evolution was studied using optical microscopy and EBSD. The EBSD measurements showed a relaxation time of 95 % for fractional recrystallization grains, 𝑡95, in both structures, was less than 30 seconds at the deformation temperatures 1100 °C and 1200 °C. However, fewer than 95% of recrystallized grains recrystallized when the deformation temperature was lowered to 1000 °C. From the grain-boundary misorientation distribution in statically recrystallized samples, the fraction of high-angle grain boundaries decreased with an increasing deformation temperature from 1000 °C to 1200 °C for a given relaxation time. This was attributed to grain coarsening

Series
Journal of Physics: Conference Series, ISSN 1742-6588
Keywords
Alloy 825, Static recrystallization, hot compression, Gleeble-3800 thermo simulator
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
urn:nbn:se:kth:diva-258210 (URN)10.1088/1742-6596/1270/1/012023 (DOI)2-s2.0-85072107757 (Scopus ID)
Conference
7th International Conference on Recrystallization and Grain Growth, Ghent,August 4-9, 2019
Note

QC 20190916

Available from: 2019-09-10 Created: 2019-09-10 Last updated: 2019-10-28Bibliographically approved
Wang, Y., Karasev, A. & Jönsson, P. G. (2019). An Investigation of Non-Metallic Inclusions in Different Ferroalloys using Electrolytic Extraction. Metals, 9(6)
Open this publication in new window or tab >>An Investigation of Non-Metallic Inclusions in Different Ferroalloys using Electrolytic Extraction
2019 (English)In: Metals, ISSN 2075-4701, Vol. 9, no 6Article in journal (Refereed) Published
Abstract [en]

Ferroalloys are integral constituents of the steelmaking process, since non-metallic inclusions (NMIs) from ferroalloys significantly influence the transformation of inclusions present in liquid steel or they are directly involved in casted steel. In this study, the characteristics of inclusions (such as the number, morphology, size, and composition) in different industrial ferroalloys (FeV, FeMo, FeB, and FeCr) were investigated using the electrolytic extraction (EE) technique. After extraction from the ferroalloy samples and filtration of the solution, the inclusions were investigated on a film filter. The three-dimensional (3D) investigations were conducted using a scanning electron microscopy in combination with energy dispersive spectroscopy (SEM-EDS). The characteristics of inclusions observed in the ferroalloys were compared with previous results and discussed with respect to their possible behaviors in the melt and their effects on the quality of the cast steels. The particle size distributions and floatation distances were plotted for the main inclusion types. The results showed that the most harmful inclusions in the ferroalloys investigated are the following: pure Al2O3 and high Al2O3-containing inclusions in FeV alloys; pure SiO2 and high SiO2-containing inclusions in FeMo alloys; Al2O3 and SiO2-containing inclusions in FeB alloys; and MnO-Cr2O3, Al2O3, and Cr2O3-based inclusions in FeCr alloys.

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
ferroalloy, non-metallic inclusions, electrolytic extraction, steel quality
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-255578 (URN)10.3390/met9060687 (DOI)000475356500071 ()2-s2.0-85070702491 (Scopus ID)
Note

QC 20190802

Available from: 2019-08-02 Created: 2019-08-02 Last updated: 2019-10-04Bibliographically approved
Jarnerud, T., Karasev, A. & Jönsson, P. G. (2019). Briquetting of wastes from pulp and paper industries by using AOD converter slag as binders for application in metallurgy. Materials, 12(18), Article ID 2888.
Open this publication in new window or tab >>Briquetting of wastes from pulp and paper industries by using AOD converter slag as binders for application in metallurgy
2019 (English)In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 12, no 18, article id 2888Article in journal (Refereed) Published
Abstract [en]

A number of carbon-rich (containing up to 47 wt% C) and lime-rich (containing up to 96 wt% of CaO-compounds) waste products from the pulp and paper industries can be used in iron and steel industry as fuels and slag formers for various metallurgical processes such as blast furnaces (BF), cupola furnaces (CF), argon oxygen decarburization (AOD) converters and electric arc furnaces (EAF). In most cases, these wastes consist of different size powders. In order to facilitate loading, transportation and charging of these powder wastes, briquetting is required. In this study, a pulverized AOD slag was tested as a binder component for briquetting of CaO-containing wastes (such as mesa, lime mud and fly ash) from pulp and paper industries. Moreover, mechanical testing of the possibilities for loading, transportation and unloading operations were done, specifically drop test trials were done for briquettes with different chemical compositions and treatments such as heating and storage. The results showed that an addition of 10-20% of AOD slag as a binder component followed by heat-treatment at 850 °C significantly improved the mechanical properties of the CaO-containing briquettes. An application of these briquettes will significantly reduce the consumption of natural resources (such as nature lime) in the metallurgical processes. Moreover, it can reduce the landfill area of wastes from pulp and paper industries, which is important from an environmental point-of-view.

Place, publisher, year, edition, pages
MDPI AG, 2019
Keywords
Metallurgical briquettes, Recirculation of wastes, Resource saving, Secondary raw materials
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-262500 (URN)10.3390/ma12182888 (DOI)000489126600047 ()2-s2.0-85072564307 (Scopus ID)
Note

QC 20191017

Available from: 2019-10-17 Created: 2019-10-17 Last updated: 2019-11-25Bibliographically approved
Nabeel, M., Alba, M., Karasev, A., Jönsson, P. G. & Dogan, N. (2019). Characterization of Inclusions in 3rd Generation Advanced High-Strength Steels. Metallurgical and materials transactions. B, process metallurgy and materials processing science, 50(4), 1674-1685
Open this publication in new window or tab >>Characterization of Inclusions in 3rd Generation Advanced High-Strength Steels
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2019 (English)In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 50, no 4, p. 1674-1685Article in journal (Refereed) Published
Abstract [en]

Samples taken from laboratory-produced 3rd generation advanced high-strength steels, solidified at a low cooling rate, have been investigated to study the characteristics of non-metallic inclusions. Two steels, containing 2 and 5 pct Mn content, were produced for this purpose. A higher number of total inclusions were observed in 5 pct Mn steel. The four main types of inclusions observed were Al2O3, AlN, MnS, and AlSiMn-oxide. These classes were divided into subclasses according to variations in their chemistry. The major subclasses of AlN inclusions are either plate-like or regular in shape and have different size distributions. Thermodynamic calculations suggest that plate-like AlN inclusions are formed at the initial stage of solidification, while faceted/regular-shaped inclusions are precipitated toward the end of solidification. Moreover, it was found that the size of nitride inclusions is related to their N content. This phenomenon is discussed from the viewpoint of nucleation theory.

Place, publisher, year, edition, pages
Springer, 2019
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-255553 (URN)10.1007/s11663-019-01605-0 (DOI)000475698700016 ()2-s2.0-85066623028 (Scopus ID)
Note

QC 20190808

Available from: 2019-08-08 Created: 2019-08-08 Last updated: 2019-08-08Bibliographically approved
Nabeel, M., Alba, M., Sun, S., Karasev, A., Jönsson, P. & Dogan, N. (2019). Characterization of inclusions in high-Mn steel using two-dimensional and three-dimensional methods. Iron & Steel Technology, 16(7), 74-82
Open this publication in new window or tab >>Characterization of inclusions in high-Mn steel using two-dimensional and three-dimensional methods
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2019 (English)In: Iron & Steel Technology, ISSN 1547-0423, Vol. 16, no 7, p. 74-82Article in journal (Refereed) Published
Abstract [en]

The characteristics of inclusions in high-manganese steel samples from laboratory-scale experiments were investigated. This was done by two-dimensional and three-dimensional methods. In the two-dimensional investigations, inclusions on polished cross-sections were observed by using automatic scanning electron microscopy analysis. For the three-dimensional investigations, inclusions collected on a film filter after electrolytic extraction were observed. It was found that electrolytic extraction could be successfully applied to high-manganese steels. Further, automatic analysis, which is a common practice in steel industry, has limitations for the detection and classification of nitride inclusions, whereas it was possible to detect nitrides using the three-dimensional method.

Place, publisher, year, edition, pages
Association for Iron & Steel Technology, 2019
Keywords
Extraction, Nitrides, Scanning electron microscopy, Steelmaking, Automatic analysis, Automatic scanning, Electrolytic extraction, High manganese steel, High Mn steels, Three-dimensional method, Manganese steel
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-262456 (URN)2-s2.0-85069550030 (Scopus ID)
Note

QC 20191018

Available from: 2019-10-18 Created: 2019-10-18 Last updated: 2019-11-13Bibliographically approved
Gorkusha, D. V., Grigorovich, K. V., Karasev, A. & Komolova, O. A. (2019). Content modification of different types of nonmetallic inclusions during low-carbon if steel ladle treatment. Izvestiya Ferrous Metallurgy, 62(5), 345-352
Open this publication in new window or tab >>Content modification of different types of nonmetallic inclusions during low-carbon if steel ladle treatment
2019 (English)In: Izvestiya Ferrous Metallurgy, ISSN 0368-0797, Vol. 62, no 5, p. 345-352Article in journal (Refereed) Published
Abstract [en]

Development of advanced materials for the automotive industry allows us to produce a lighter body without losing strength characteristics of the structure. It became possible by the creation and subsequent introduction into the production of such steel grades as IF (Interstitial Free)-steel with no interstitial solute atoms to strain the solid iron lattice and IF-BH (Bake Hardening)-steel with hardening during hot drying. The article provides a brief overview of the history of the emergence of IF steel and the current situation in the production of it in Russia. One of the quality criteria for steels of IF grades is purity of the metal by non-metallic inclusions (NMI), which negatively affect the plastic properties of the material, lead to the formation of surface defects of flat rolled products and reduce the manufacturability due to a decrease in the casting speed of steel, as they cause overgrowing of steel casting nozzles. The article presents investigation results of the content, composition, size and morphology of non-metallic inclusions (NMI) in the metal samples taken at all stages of ladle treatment and casting of IF steel grade production using quantitative metallographic analysis, electrochemical dissolution (ED) followed by X-ray microanalysis of isolated inclusions, Auger electron spectroscopy and fractional gas analysis (FGA). As a result of the analysis of inclusions in the studied samples using a scanning electron microscope, according to morphological features, five characteristic types of inclusions were identified, which reduce the performance properties and strength characteristics of the materials produced from them. Results of the analysis of nonmetallic inclusions in metal samples obtained by the ED method are in good agreement with the results of the determination of oxide nonmetallic inclusions by the FGA method. The method of fractional gas analysis shows the dynamics of changes in the content of various types of oxide nonmetallic inclusions during the secondary (ladle) treatment of steel. It is shown that application of the FGA me­ thod allows to make analysis of causes of the harmful NMI formation in the metal and to correct operations at ladle treatment.

Place, publisher, year, edition, pages
National University of Science and Technology MISIS, 2019
Keywords
BH-effect, Electrolytic dissolution, Fractional gas analysis, IF steel, IF-BH steel, Non-metallic inclusions, Steel production, Ultralowcarbon steel
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-262423 (URN)10.17073/0368-0797-2019-5-345-352 (DOI)2-s2.0-85069647400 (Scopus ID)
Note

QC 20191104

Available from: 2019-11-04 Created: 2019-11-04 Last updated: 2019-11-04Bibliographically approved
Sidorova, E., Karasev, A., Kuznetsov, D. & Jönsson, P. (2019). Modification of Non-Metallic Inclusions in Oil-Pipeline Steels by Ca-Treatment. METALS, 9(4), Article ID 391.
Open this publication in new window or tab >>Modification of Non-Metallic Inclusions in Oil-Pipeline Steels by Ca-Treatment
2019 (English)In: METALS, ISSN 2075-4701, Vol. 9, no 4, article id 391Article in journal (Refereed) Published
Abstract [en]

Corrosion rate in different steel grades (including oilfield pipeline steels) is determined by the presence of non-metallic inclusions (NMI) in steels. Specifically, the effect of different inclusions on the quality of steels depends on their characteristics such as size, number, morphology, composition, and physical properties, as well as their location in the steel matrix. Therefore, the optimization and control of NMI in steels are very important today to obtain an improvement of the material properties of the final steel products. It is well known that a Ca-treatment of liquid steels in ladle before casting is an effective method for modification of non-metallic inclusions for improvement of the steel properties. Therefore, the NMI characteristics were evaluated in industrial steel samples of low carbon Ca-treated steel used for production of oil-pipelines. An electrolytic extraction technique was used for extraction of NMI from the steel samples followed by three-dimensional investigations of different inclusions and clusters by using SEM in combination with EDS. Moreover, the number and compositions of corrosion active non-metallic inclusions were estimated in hot rolled steel samples from two different heats. Finally, the corrosion resistance of these steels can be discussed depending on the characteristics of non-metallic inclusions present in the steel.

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
oil-pipeline steel, Ca-treatment, non-metallic inclusions, electrolytic extraction, corrosion
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-252645 (URN)10.3390/met9040391 (DOI)000467637000008 ()2-s2.0-85064179266 (Scopus ID)
Note

QC 20190610

Available from: 2019-06-10 Created: 2019-06-10 Last updated: 2019-06-10Bibliographically approved
Du, H., Karasev, A., Sundqvist, O. & Jönsson, P. (2019). Modification of Non-Metallic Inclusions in Stainless Steel by Addition of CaSi. METALS, 9(1), Article ID 74.
Open this publication in new window or tab >>Modification of Non-Metallic Inclusions in Stainless Steel by Addition of CaSi
2019 (English)In: METALS, ISSN 2075-4701, Vol. 9, no 1, article id 74Article in journal (Refereed) Published
Abstract [en]

The focus of this study involved comparative investigations of non-metallic inclusions in 316L stainless steel bars without and with Ca treatments. The inclusions were extracted by using electrolytic extraction (EE). After that, the characteristics of the inclusions, such as morphology, size, number, and composition, were investigated by using a scanning electron microscope (SEM) in combination with an energy dispersive X-ray spectroscopy (EDS). The following four types of inclusions were observed in 316L steels: (1) Elongated MnS (Type I), (2) MnS with hard oxide cores (Type II), (3) Undeformed irregular oxides (Type III), and (4) Elongated oxides with a hard oxide core (Type IV). In the reference sample, only a small amount of the Type III oxides (Al2O3-MgO-MnO-TiOx) existed. However, in Ca-treated 316L steel, about 46% of the observed inclusions were oxide inclusions (Types III and IV) correlated to gehlenite and to a mixture of gehlenite and anorthite, which are favorable for the machinability of steel. Furthermore, untransformed oxide cores (Al2O3-MgO-MnO) were also found in the inclusions of Type IV. The mechanism leading to different morphologies of oxide inclusions is also discussed.

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
stainless steel, Ca treatment, non-metallic inclusion, electrolytic extraction
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-246294 (URN)10.3390/met9010074 (DOI)000459738500073 ()2-s2.0-85060092047 (Scopus ID)
Note

QC 20190325

Available from: 2019-03-25 Created: 2019-03-25 Last updated: 2019-03-25Bibliographically approved
De Colle, M., Jönsson, P., Karasev, A., Gauffin, A., Renman, A. & Renman, G. (2019). The Use of High-Alloyed EAF Slag for the Neutralization of On-Site Produced Acidic Wastewater: The First Step Towards a Zero-Waste Stainless-Steel Production Process. Applied Sciences, 9
Open this publication in new window or tab >>The Use of High-Alloyed EAF Slag for the Neutralization of On-Site Produced Acidic Wastewater: The First Step Towards a Zero-Waste Stainless-Steel Production Process
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2019 (English)In: Applied Sciences, ISSN 2076-3417, Vol. 9Article in journal (Refereed) Published
Abstract [en]

Recycling of steelmaking slags has well-established applications, such as their use in cement, asphalt, or fertilizer industries. Although in some cases, such as the electric arc furnace (EAF) high-alloyed stainless-steel production, the slag’s high metal content prevents its use in such applications. This forces companies to accumulate it as waste. Using concepts such dematerialization, waste management, industrial symbiosis, and circular economy, the article drafts a conceptual framework on the best route to solving the landfilling issue, aiming at a zero-waste process re-design. An experimental part follows, with an investigation of the use of landfill slag as a substitute of limestone for the neutralization of acidic wastewater, produced by the rinsing of steel after the pickling process. Neutralization of acidic wastewater with both lime and slag samples was performed with two different methods. Two out of four slag samples tested proved their possible use, reaching desired pH values compared to lime neutralizations. Moreover, the clean waters resulting from the neutralizations with the use of both lime and slag were tested. In terms of hazardous element concentrations, neutralization with slag yielded similar results to lime. The results of these trials show that slag is a potential substitute of lime for the neutralization of acidic wastewater.

Keywords
EAF slag; recycling; re-use; wastewater treatment; sustainable production; dematerialization; zero waste; circular economy
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
urn:nbn:se:kth:diva-260091 (URN)10.3390/app9193974 (DOI)000496258100033 ()2-s2.0-85073266415 (Scopus ID)
Note

QC 20191001

Available from: 2019-09-25 Created: 2019-09-25 Last updated: 2019-12-04Bibliographically approved
Nabeel, M., Alba, M., Sun, S., Karasev, A., Jönsson, P. & Dogan, N. (2018). Characterization of inclusions in high-Mn steel using two-dimensional and three-dimensional methods. In: AISTech - Iron and Steel Technology Conference Proceedings: . Paper presented at AISTech 2018 Iron and Steel Technology Conference and Exposition, 7 May 2018 through 10 May 2018 (pp. 1483-1491). Association for Iron and Steel Technology, AISTECH
Open this publication in new window or tab >>Characterization of inclusions in high-Mn steel using two-dimensional and three-dimensional methods
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2018 (English)In: AISTech - Iron and Steel Technology Conference Proceedings, Association for Iron and Steel Technology, AISTECH , 2018, p. 1483-1491Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Association for Iron and Steel Technology, AISTECH, 2018
Keywords
Automated SEM, Electrolytic extraction, High manganese, Inclusions
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-247402 (URN)2-s2.0-85062522160 (Scopus ID)9781935117728 (ISBN)
Conference
AISTech 2018 Iron and Steel Technology Conference and Exposition, 7 May 2018 through 10 May 2018
Note

QC 20190418

Available from: 2019-04-18 Created: 2019-04-18 Last updated: 2019-10-18Bibliographically approved
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