Improving chill control in iron powder treated slightly hypereutectic grey cast irons
Recent studies revealed that in eutectic to slightly hypereutectic grey irons (CE = 4.3%-4.5%) the presence of austenite dendrites provides an opportunity to improve the cast iron properties, as a high number of eutectic cells are “reinforced” by austenite dendrites. An iron powder addition proved t...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Foundry Journal Agency
2011-05-01
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| Series: | China Foundry |
| Subjects: | |
| Online Access: | http://www.foundryworld.com/uploadfile/2011062942216129.pdf |
| _version_ | 1818497456440082432 |
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| author | Iulian Riposan Mihai Chisamera Stelian Stan |
| author_facet | Iulian Riposan Mihai Chisamera Stelian Stan |
| author_sort | Iulian Riposan |
| collection | DOAJ |
| description | Recent studies revealed that in eutectic to slightly hypereutectic grey irons (CE = 4.3%-4.5%) the presence of austenite dendrites provides an opportunity to improve the cast iron properties, as a high number of eutectic cells are “reinforced” by austenite dendrites. An iron powder addition proved to be important by promoting dendritic austenite in hypereutectic irons, but was accompanied by adverse effect on the characteristics of potential nuclei for graphite. The purpose of the present paper is to investigate the solidification pattern of these irons. Chill wedges with different cooling moduli (CM = 0.11 – 0.43 cm) were poured in resin bonded sand and metal moulds. Relative clear / mottled / total chill measurement criteria were applied. Iron powder additions led to a higher chill tendency, while single inoculation showed the strongest graphitizing effect. The various double treatments show an intermediate position, but the inoculant added after iron powder appears to be the most effective in reducing base iron chill tendency, for all cooling moduli and chill evaluation parameters. This performance reflects the improved properties of (Mn,X)S polygonal compounds as nucleation sites for graphite, especially in resin bonded sand mould castings. Both austenite and graphite nucleation benefit from a double addition of iron powder + inoculant, with positive effect on the final structure and chill tendency. |
| first_indexed | 2024-12-10T18:45:59Z |
| format | Article |
| id | doaj.art-88f14ecc93cc4f929c38e9b774c5acab |
| institution | Directory Open Access Journal |
| issn | 1672-6421 |
| language | English |
| last_indexed | 2024-12-10T18:45:59Z |
| publishDate | 2011-05-01 |
| publisher | Foundry Journal Agency |
| record_format | Article |
| series | China Foundry |
| spelling | doaj.art-88f14ecc93cc4f929c38e9b774c5acab2022-12-22T01:37:29ZengFoundry Journal AgencyChina Foundry1672-64212011-05-0182228234Improving chill control in iron powder treated slightly hypereutectic grey cast ironsIulian RiposanMihai ChisameraStelian StanRecent studies revealed that in eutectic to slightly hypereutectic grey irons (CE = 4.3%-4.5%) the presence of austenite dendrites provides an opportunity to improve the cast iron properties, as a high number of eutectic cells are “reinforced” by austenite dendrites. An iron powder addition proved to be important by promoting dendritic austenite in hypereutectic irons, but was accompanied by adverse effect on the characteristics of potential nuclei for graphite. The purpose of the present paper is to investigate the solidification pattern of these irons. Chill wedges with different cooling moduli (CM = 0.11 – 0.43 cm) were poured in resin bonded sand and metal moulds. Relative clear / mottled / total chill measurement criteria were applied. Iron powder additions led to a higher chill tendency, while single inoculation showed the strongest graphitizing effect. The various double treatments show an intermediate position, but the inoculant added after iron powder appears to be the most effective in reducing base iron chill tendency, for all cooling moduli and chill evaluation parameters. This performance reflects the improved properties of (Mn,X)S polygonal compounds as nucleation sites for graphite, especially in resin bonded sand mould castings. Both austenite and graphite nucleation benefit from a double addition of iron powder + inoculant, with positive effect on the final structure and chill tendency.http://www.foundryworld.com/uploadfile/2011062942216129.pdfhypereutectic grey ironiron powderinoculationchill tendency(MnX)Sgraphite nuclei |
| spellingShingle | Iulian Riposan Mihai Chisamera Stelian Stan Improving chill control in iron powder treated slightly hypereutectic grey cast irons China Foundry hypereutectic grey iron iron powder inoculation chill tendency (Mn X)S graphite nuclei |
| title | Improving chill control in iron powder treated slightly hypereutectic grey cast irons |
| title_full | Improving chill control in iron powder treated slightly hypereutectic grey cast irons |
| title_fullStr | Improving chill control in iron powder treated slightly hypereutectic grey cast irons |
| title_full_unstemmed | Improving chill control in iron powder treated slightly hypereutectic grey cast irons |
| title_short | Improving chill control in iron powder treated slightly hypereutectic grey cast irons |
| title_sort | improving chill control in iron powder treated slightly hypereutectic grey cast irons |
| topic | hypereutectic grey iron iron powder inoculation chill tendency (Mn X)S graphite nuclei |
| url | http://www.foundryworld.com/uploadfile/2011062942216129.pdf |
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