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- Diószegi, Attila, 1962-, et al.
(author)
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Shrinkage porosity formation in cast iron components
- 2018
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In: 73rd World Foundry Congress "Creative Foundry", WFC 2018 - Proceedings. - : Stowarzyszenie Techniczne Odlewnikow Polskich/Polish Foundrymen's Association. - 9788390430638 ; , s. 207-208
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Conference paper (peer-reviewed)abstract
- Shrinkage porosity formation mechanisms at production of cast iron components is particularly complex and became more and more difficult to understand since the shape casting complexity have been increased more and more in advanced component applications. The present work intends to summarize the state of the art in understanding the shrinkage porosity formation mechanism of cast iron based on a series of key publications, MSc and PhD theses performed in collaboration between cast iron component users, producers and researchers.
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| 2. |
- Diószegi, Attila, et al.
(author)
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Solubility of Hydrogen and Nitrogen in liquid cast iron during melting and mold filling
- 2016
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In: 72nd World Foundry Congress, WFC 2016. - : The World Foundry Organization (WFO). - 9781510833128 ; , s. 52-53
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Conference paper (peer-reviewed)abstract
- Defect formation like gas- and shrinkage porosity at cast iron component production is related to the content of gaseous elements in the liquid metal. The present work investigate the solubility of hydrogen and nitrogen in liquid iron aimed for production of lamellar and compacted graphite cast iron. The used methods and instruments are a combination of commercial measuring devices and novel experimental assemblies for measuring solubility of hydrogen and nitrogen during melting and mold filling of a complex shaped cast component. The obtained results reveal the role of the charge material and the mold filling on the solubility of the investigated elements.
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| 3. |
- Domeij, Björn, 1988-, et al.
(author)
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Evolution of Dendritic Austenite in Parallel With Eutectic in Compacted Graphite Iron Under Three Cooling Conditions
- 2023
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In: Metallurgical and materials transactions. B, process metallurgy and materials processing science. - : Springer. - 1073-5615 .- 1543-1916. ; 54, s. 2395-2410
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Journal article (peer-reviewed)abstract
- Shrinkage defects are common problems in industrially produced metal cast components. Local density changes occur during freezing, which demand material transport between parts of the casting, often involving flow of liquid through partially solid regions. Cast alloys typically freeze with a dendritic morphology, which large interface against the liquid restricts liquid flow. Recent research also indicates that this dendritic structure has an impact on the mechanical properties of the final material. For these reasons it is important to understand and predict the evolution of this structure through the solidification of cast alloys. In this work, the evolution of the dendritic austenite structure is investigated in a near-eutectic compacted graphite iron solidified under three different cooling conditions. The solidification was interrupted by water quenching, enabling characterization of the dendritic austenite structure at different stages of solidification. Higher cooling rate was found to promote a more coherent dendritic austenite structure which constituted a larger volume fraction. In parallel with growth of the eutectic, the amount of dendritic austenite in extra-eutectic regions continued to rise. This rise was associated with both tip growth of new dendrites and with growth by thickening of existing dendrites.
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| 8. |
- Elfsberg, Jessica, et al.
(author)
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Measurements and Calculation of Interfacial Tension between Commercial Steels and Mould Flux Slags
- 2011
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In: Steel Research International. - : Wiley. - 1611-3683 .- 1869-344X. ; 82:4, s. 404-414
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Journal article (peer-reviewed)abstract
- Surface quality of continuously cast is strongly influenced by the interfacial tension between steel and mould flux slag. The meniscus shape and the inclusion entrapment are directly determined by interfacial tension. To achieve a better understanding of the continuous casting process, the interface between four commercial steels and the mould fluxes used at the continuous casting of each steel grade have been investigated. The situation at this interface is determined by the surface tension of steel and slag respectively and also by the mass transfer occurring across the interface. The surface tensions of the mould flux slags have been measured by sessile drop method. The results indicate that the surface tension of mould flux slags decreases with increasing temperature but does not vary so much within the present composition range. Interfacial tensions between steel samples and mould flux slags have been measured in the same way with the aid of X-ray unit. Estimation of interfacial tension from the steel and slag composition was done by applying empirical models. The measured and the calculated values were in agreement. The interfacial tension was lower for higher alloyed steel grades according to both experiments and calculations though the influence of surface active elements is significant.
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