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Publikasjoner (10 av 96) Visa alla publikasjoner
Belov, I., Matsushita, T., Fourlakidis, V., Sundaram, D. & Diószegi, A. (2023). A simulation and experimental methodology to evaluate conditions for gas penetration from FURAN sand core into a cast iron melt. In: : . Paper presented at 17th European Congress and Exhibition on Advance Materials and Processes, FEMS EUROMAT 2023, 03-07 September 2023, Germany.
Åpne denne publikasjonen i ny fane eller vindu >>A simulation and experimental methodology to evaluate conditions for gas penetration from FURAN sand core into a cast iron melt
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2023 (engelsk)Konferansepaper, Oral presentation only (Fagfellevurdert)
HSV kategori
Identifikatorer
urn:nbn:se:hj:diva-63231 (URN)
Konferanse
17th European Congress and Exhibition on Advance Materials and Processes, FEMS EUROMAT 2023, 03-07 September 2023, Germany
Tilgjengelig fra: 2024-01-09 Laget: 2024-01-09 Sist oppdatert: 2024-01-10bibliografisk kontrollert
Belov, I., Fourlakidis, V., Domeij, B., Matsushita, T. & Diószegi, A. (2023). A thermal conductivity model for grey iron. International Journal of metalcasting
Åpne denne publikasjonen i ny fane eller vindu >>A thermal conductivity model for grey iron
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2023 (engelsk)Inngår i: International Journal of metalcasting, ISSN 1939-5981, E-ISSN 2163-3193Artikkel i tidsskrift (Fagfellevurdert) Epub ahead of print
Abstract [en]

Thermal conductivity is an important property for many iron cast components, and the lack of widely accepted thermal conductivity model for cast iron, especially grey cast iron, motivates the efforts in this research area. The present study contributes to understanding the effects alloy microstructure has on thermal conductivity. A thermal conductivity model for a pearlitic cast iron has been proposed, based on the as-cast alloy composition and microstructural parameters obtained at different solidification rates. According to the model, available parallel heat transfer paths formed by connected graphite flakes across eutectic cells are determined by the space between dendrite arms. The uncertainties both for model inputs and for validation measurements have been estimated. Sensitivity analysis has been conducted to result in better understanding of the model behaviour. The agreement between modelled and measured thermal conductivities has been achieved within 5% on the average for the investigated samples.

sted, utgiver, år, opplag, sider
Springer, 2023
HSV kategori
Identifikatorer
urn:nbn:se:hj:diva-62560 (URN)10.1007/s40962-023-01157-9 (DOI)001073921500002 ()2-s2.0-85172984032 (Scopus ID)HOA;;907155 (Lokal ID)HOA;;907155 (Arkivnummer)HOA;;907155 (OAI)
Forskningsfinansiär
Knowledge Foundation, 20210082, 20180033
Tilgjengelig fra: 2023-10-02 Laget: 2023-10-02 Sist oppdatert: 2024-01-10
Matsushita, T., Belov, I., Svidró, J. T., Svidró, J. & Diószegi, A. (2023). Analysis of the penetration behavior of molten cast iron into the sand mold. International Journal of metalcasting
Åpne denne publikasjonen i ny fane eller vindu >>Analysis of the penetration behavior of molten cast iron into the sand mold
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2023 (engelsk)Inngår i: International Journal of metalcasting, ISSN 1939-5981, E-ISSN 2163-3193Artikkel i tidsskrift (Fagfellevurdert) Epub ahead of print
Abstract [en]

An evaluation method for the initial penetration of molten cast iron into the sand mold was suggested based on the laboratory-scale penetration experiments for the cast iron. The horizontal penetration depth of the molten cast iron into the sand core was analyzed using the capillary model. The early stage of the penetration was discussed, and it was clarified that the penetration is not stopped by the solidification but is stopped by the decreasing of the equivalent pore radius. It was explained that the equivalent pore radius decreases with increasing the penetration depth, and the penetration is stopped when the critical pressure, i.e., the pressure required for the penetration, becomes higher than the pressure which is acting on the penetration front. Based on the analysis, an evaluation method of the penetration of depth at the early stage of the penetration was suggested. The analysis method was applied for the other type of metals (mercury and steel) as well, and reasonable results were obtained. A simplified finite-element model of liquid iron penetration into a sand core was developed, accounting for heat exchange between the melt and the porous medium, at different pore geometries.

sted, utgiver, år, opplag, sider
Springer, 2023
Emneord
penetration, molten metal, porous medium, casting, surface defects, cast iron, finite element simulation
HSV kategori
Identifikatorer
urn:nbn:se:hj:diva-62796 (URN)10.1007/s40962-023-01169-5 (DOI)001089876100004 ()2-s2.0-85174849547 (Scopus ID)HOA;;62796 (Lokal ID)HOA;;62796 (Arkivnummer)HOA;;62796 (OAI)
Forskningsfinansiär
Knowledge Foundation, 20180033, 20200057, 20210082
Tilgjengelig fra: 2023-10-30 Laget: 2023-10-30 Sist oppdatert: 2023-11-28
Domeij, B., Belov, I., Fourlakidis, V. & Diószegi, A. (2023). Implementation and Validation of Casting Simulation Methodology for Diagnostics of Lamellar Graphite Iron. International Journal of metalcasting, 17, 1507-1517
Åpne denne publikasjonen i ny fane eller vindu >>Implementation and Validation of Casting Simulation Methodology for Diagnostics of Lamellar Graphite Iron
2023 (engelsk)Inngår i: International Journal of metalcasting, ISSN 1939-5981, E-ISSN 2163-3193, Vol. 17, s. 1507-1517Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This paper describes and validates a methodology for implementation of full-scale sand-casting simulation in a general-purpose finite element software, including mold filling, heat transport, solidification kinetics, chemical microsegregation and prediction of microstructure and material properties. The solidification model, customized for gray cast iron, includes novel methods for handling interaction between parallel dendritic and eutectic solidification modes and its impact of their interaction on the final microstructure. The validation involves a previously published gray iron casting experiment and involves comparison of simulated and experimental cooling curves, microstructure parameters and tensile strength. We believe that this is valuable to researchers and engineers seeking to improve the state of the art of casting simulation tools.

sted, utgiver, år, opplag, sider
Springer, 2023
Emneord
simulation, casting, solidification, gray cast iron, level-set method
HSV kategori
Identifikatorer
urn:nbn:se:hj:diva-58657 (URN)10.1007/s40962-022-00892-9 (DOI)000864958100001 ()2-s2.0-85139516629 (Scopus ID)HOA;;837798 (Lokal ID)HOA;;837798 (Arkivnummer)HOA;;837798 (OAI)
Forskningsfinansiär
Knowledge Foundation
Tilgjengelig fra: 2022-10-18 Laget: 2022-10-18 Sist oppdatert: 2024-01-10bibliografisk kontrollert
Domeij, B., Belov, I., Fourlakidis, V. & Diószegi, A. (2023). Metodik för kort väg mellan forskning och gjutsimuleringsverktyg. Gjuteriet (1), 12-13
Åpne denne publikasjonen i ny fane eller vindu >>Metodik för kort väg mellan forskning och gjutsimuleringsverktyg
2023 (svensk)Inngår i: Gjuteriet, E-ISSN 0017-0682, nr 1, s. 12-13Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm)) Published
HSV kategori
Identifikatorer
urn:nbn:se:hj:diva-63280 (URN)
Tilgjengelig fra: 2024-01-10 Laget: 2024-01-10 Sist oppdatert: 2024-01-10bibliografisk kontrollert
Belov, I., Matsushita, T., Johansson, A. & Jarfors, A. E. .. (2023). Simulation and Experimental Methodology for Virtual Prototyping of Annealed Industrial Coils. Heat Transfer Engineering, 44(4), 353-367
Åpne denne publikasjonen i ny fane eller vindu >>Simulation and Experimental Methodology for Virtual Prototyping of Annealed Industrial Coils
2023 (engelsk)Inngår i: Heat Transfer Engineering, ISSN 0145-7632, E-ISSN 1521-0537, Vol. 44, nr 4, s. 353-367Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The finite element three-dimensional transient model of the annealing process, including conductive and convective heat transfer in an aluminum (Al) coil was developed, implemented, and validated. It combines winding force dependent effective radial thermal conductivity model and the novel convective heat transfer modeling methodology. Experimental validation of the finite element model was performed for two industrial coils having different dimensions, strip thickness and crowning depth. The general agreement between the predicted and measured temperatures for most of the probes was better than 10% at the target material temperature. A series of measurements were configured and performed to supply both the input and validation data for the simulations. The effect of the additional wetted area on the convective heat transfer at the coil base was quantified. The guidelines on the virtual prototyping of the Al coil annealing process were provided, which can be of interest for the process designers.

sted, utgiver, år, opplag, sider
Taylor & Francis, 2023
HSV kategori
Identifikatorer
urn:nbn:se:hj:diva-56327 (URN)10.1080/01457632.2022.2059217 (DOI)000782307700001 ()2-s2.0-85129145746 (Scopus ID)HOA;;808970 (Lokal ID)HOA;;808970 (Arkivnummer)HOA;;808970 (OAI)
Tilgjengelig fra: 2022-05-02 Laget: 2022-05-02 Sist oppdatert: 2023-10-02bibliografisk kontrollert
Fourlakidis, V., Belov, I. & Diószeg, A. (2022). Experimental model of the pearlite interlamellar spacing in lamellar graphite iron. Tecnologia em Metalurgia, Materiais e Mineração, 19, Article ID e2634.
Åpne denne publikasjonen i ny fane eller vindu >>Experimental model of the pearlite interlamellar spacing in lamellar graphite iron
2022 (engelsk)Inngår i: Tecnologia em Metalurgia, Materiais e Mineração, ISSN 2176-1515, Vol. 19, artikkel-id e2634Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The pearlite lamellar spacing (λpearlite) is one of the microstructure parameters that define the strength of the lamellar graphite iron (LGI). The transformation kinetics of λpearlite has been the subject of several modeling studies for steels, which demonstrated that the λpearlite can be calculated as a function of undercooling. However, it is hard to find in the literature the models for the prediction of λpearlite in LGI. In the present work, λpearlite in fully pearlitic LGI was investigated for a wide range of carbon contents and cooling rates. The undercooling and the cooling rates were estimated from the experimental cooling curves and were utilized for the prediction of λpearlite. The experimental data analysis provides an empirical expression that correlates λpearlite and cooling rates from the eutectoid transformation region. The developed empirical model was incorporated into a casting simulation software to enable the prediction of λpearlite in LGI and the simulation results were found to be in good agreement with the experimental data.

sted, utgiver, år, opplag, sider
Editora Cubo, 2022
Emneord
Pearlite interlamellar spacing; Lamellar graphite iron; Eutectoid transformation
HSV kategori
Identifikatorer
urn:nbn:se:hj:diva-57962 (URN)10.4322/2176-1523.20222634 (DOI)GOA;;57962 (Lokal ID)GOA;;57962 (Arkivnummer)GOA;;57962 (OAI)
Forskningsfinansiär
Knowledge Foundation, 2018-033
Merknad

Special issue: Tribute to Dr. Wilson Luiz Guesser.

Tilgjengelig fra: 2022-07-18 Laget: 2022-07-18 Sist oppdatert: 2024-01-10bibliografisk kontrollert
Matsushita, T., Belov, I., Johansson, A. & Jarfors, A. E. .. (2022). Influence of contact pressure on the thermal contact conductance of layered metallic sheets. High Temperatures-High Pressures, 51(1), 63-82
Åpne denne publikasjonen i ny fane eller vindu >>Influence of contact pressure on the thermal contact conductance of layered metallic sheets
2022 (engelsk)Inngår i: High Temperatures-High Pressures, ISSN 0018-1544, E-ISSN 1472-3441, Vol. 51, nr 1, s. 63-82Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

For the optimisation of the annealing process of aluminium coils, simulation of the process is often performed. To simulate the process with higher accuracy, reliable input parameters are required, and thermal conductivity (thermal contact conductance) is one of them. In the present study, a method to measure the thermal conductivity and thermal contact conductance of metallic sheets were developed based on the steady-state comparative longitudinal heat flow. The apparatus was built with a compression test machine, and thus it allows to control the pressure to the sample and carry out the measurements at different contact pressure. An equipped heater allows to heat the sample to 573 K. To evaluate the thermal conductance at the interface, a thermal resistance network model was applied. The measurements were carried out with an aluminium alloy (AA3003 sheets). In addition to the thermal contact conductance measurements, the surface roughness of the sheets was also investigated. The semi-empirical equation for the relationship between thermal contact conductance and contact pressure was obtained based on the measurement results.

sted, utgiver, år, opplag, sider
Old City Publishing, 2022
Emneord
Thermal conductivity, Thermal contact conductance, Pressure, Surface profile, Aluminium alloy
HSV kategori
Identifikatorer
urn:nbn:se:hj:diva-55983 (URN)10.32908/hthp.v51.1107 (DOI)000753861200004 ()2-s2.0-85127730426 (Scopus ID)
Tilgjengelig fra: 2022-03-04 Laget: 2022-03-04 Sist oppdatert: 2023-10-02bibliografisk kontrollert
Matsushita, T., Belov, I., Siafakas, D., Jarfors, A. E. .. & Watanabe, M. (2021). Interfacial phenomena between molten iron and molten slag–Effect of nitrogen on the Marangoni convection. Journal of Materials Science, 56, 7811-7822
Åpne denne publikasjonen i ny fane eller vindu >>Interfacial phenomena between molten iron and molten slag–Effect of nitrogen on the Marangoni convection
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2021 (engelsk)Inngår i: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 56, s. 7811-7822Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In order to investigate the influence of the surface-active element on the interfacial phenomena between molten iron and molten Al2O3-CaO-SiO2 slag, a mildly surface-active element, nitrogen, was introduced, and the interfacial phenomena were directly observed using an X-ray sessile drop method. The multiphysics model was employed to calculate the velocity of the Marangoni convection caused by the surface/interfacial tension gradient along with the contour of the sessile drop. Movement of the sessile drop was observed in the experiment, and the driving force of the movement was discussed from the distribution of surface tension active element viewpoint. The calculated velocity of the Marangoni convection in the droplet was reasonably agreed with the literature data for the metal-gas system, and thus, the same model was applied for the metal-slag system. The velocity of the Marangoni convection for the metal-slag system becomes ten times lower compared to that of metal-gas system.

sted, utgiver, år, opplag, sider
Springer, 2021
Emneord
Alumina, Aluminum oxide, Calcium oxide, Drops, Heat convection, Iron, Nitrogen, Silica, Active elements, Al2O3-CaO-SiO2, Interfacial phenomena, Literature data, Marangoni convection, Multi-physics modeling, Sessile drop method, Surface active elements, Slags
HSV kategori
Identifikatorer
urn:nbn:se:hj:diva-51722 (URN)10.1007/s10853-020-05730-z (DOI)000607514300001 ()2-s2.0-85099475854 (Scopus ID)HOA;intsam (Lokal ID)HOA;intsam (Arkivnummer)HOA;intsam (OAI)
Forskningsfinansiär
Swedish National Space Board, 120/14,117/15
Tilgjengelig fra: 2021-01-28 Laget: 2021-01-28 Sist oppdatert: 2023-10-02bibliografisk kontrollert
Zamani, M., Belov, I., Sjölander, E., Bjurenstedt, A., Ghassemali, E. & Seifeddine, S. (2020). Study on dissolution of Al2Cu in al-4.3cu and a205 cast alloys. Metals, 10(7), 1-17, Article ID 900.
Åpne denne publikasjonen i ny fane eller vindu >>Study on dissolution of Al2Cu in al-4.3cu and a205 cast alloys
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2020 (engelsk)Inngår i: Metals, ISSN 2075-4701, Vol. 10, nr 7, s. 1-17, artikkel-id 900Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Evolution of microstructure in a binary Al-Cu system (Al-4.3Cu) and a commercially alloyed Al-Cu system (A205) during solution heat treatment was investigated using optical microscopy (OM), scanning electron microscopy (SEM), wavelength-dispersive X-ray spectroscopy (WDS), and differential scanning calorimetry (DSC). The diversified coarseness of the microstructure was initiated by controlling the solidification rate. Different solution treatment temperatures were applied to identify a proper solutioning temperature. The larger microstructural scale required an increased solutioning temperature and prolonged holding time to obtain homogenized solutes in the α-Al matrix. The diffusion of Cu primarily controlled the solution heat treatment process. A diffusion-based model was applied and calibrated to determine the dissolution rate of an Al2Cu particle in the matrix. The model operates on a similar time scale with the experimental results for the Al-4.3Cu and A205 alloys with various microstructural scales, different chemical compositions, and at different solution treatment temperatures. Three-dimensional (3D) reconstructed images from SEM images and energy dispersive spectroscopy (EDS) map of elements showed that TiB2 particles shield the Cu-rich phases in the boundaries of α-Al grains, presumably acting as a physical barrier to the diffusion of Cu solutes toward α-Al grains. The model also suggests that the effective diffusion coefficient of Cu in Al, in the presence of TiB2 particles, reduced by a factor of 2.0–2.5 in the A205 alloy compared with the binary Al-Cu alloy.

sted, utgiver, år, opplag, sider
MDPI, 2020
Emneord
A205, Al-Cu alloy, Diffusion-based model, Solution heat treatment, TiB2 particles
HSV kategori
Identifikatorer
urn:nbn:se:hj:diva-50307 (URN)10.3390/met10070900 (DOI)000557181000001 ()2-s2.0-85088685842 (Scopus ID)GOA JTH 2020 (Lokal ID)GOA JTH 2020 (Arkivnummer)GOA JTH 2020 (OAI)
Forskningsfinansiär
Swedish Energy Agency, 2016-04330,2016-04330,2016-04330,2016-04330
Tilgjengelig fra: 2020-08-19 Laget: 2020-08-19 Sist oppdatert: 2023-10-02bibliografisk kontrollert
Organisasjoner
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0003-0534-3291