Relationship between cooling rate and microsegregation in bottom-chilled directionally solidified ductile irons
This study explores the relationship between cooling rate and microsegregation of directionally solidified ductile iron. The unidirectional heat transfer system used in this research is made up of a copper mold kept chilled by circulating water and embedded in the bottom of Furan sand mold....
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| Format: | Article |
| Language: | English |
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University of Belgrade, Technical Faculty, Bor
2013-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2013/1450-53391300034C.pdf |
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| author | Chang W.S. Lin C.M. |
| author_facet | Chang W.S. Lin C.M. |
| author_sort | Chang W.S. |
| collection | DOAJ |
| description | This study explores the relationship between cooling rate and
microsegregation of directionally solidified ductile iron. The unidirectional
heat transfer system used in this research is made up of a copper mold kept
chilled by circulating water and embedded in the bottom of Furan sand mold.
Thermocouples are connected to the computer measuring system to record the
cooling curves of the castings at a distance of 0, 30, 60 and 90 mm from the
chilled copper mold surface. Alloys including Mn, Cr, Cu, Ni and Ti were
added to the specimens. Electron microprobe analysis (EPMA) was employed to
examine distribution of elements between the dendrite arms and nodular
graphite. Results show that unidirectional heat transfer affects directly the
solidification mode and microstructure of the casting. The cooling curves
reveal that local solidification time increases with increasing distance from
the chilled copper mold surface. Different solidification rates with
corresponding microstructure and element segregation were observed in the
same unidirectionally solidified casting. Local solidification time was
closely related to element segregation. The effective segregation coefficient
(Keff) calculated using the Scheil equation was found to vary, according to
the stage of solidification. The actual segregation characteristics of
complex alloys generally follow the Scheil equation. |
| format | Article |
| id | doaj-art-57e927b4fde241769e2972ee34441d62 |
| institution | Kabale University |
| issn | 1450-5339 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | University of Belgrade, Technical Faculty, Bor |
| record_format | Article |
| series | Journal of Mining and Metallurgy. Section B: Metallurgy |
| spelling | doaj-art-57e927b4fde241769e2972ee34441d622025-02-02T10:00:38ZengUniversity of Belgrade, Technical Faculty, BorJournal of Mining and Metallurgy. Section B: Metallurgy1450-53392013-01-0149331532210.2298/JMMB120702034C1450-53391300034CRelationship between cooling rate and microsegregation in bottom-chilled directionally solidified ductile ironsChang W.S.0Lin C.M.1Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei, TaiwanDepartment of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan + School of Mechanical, Aerospace, Chemical, and Materials Engineering, Arizona State University, Tempe, United StatesThis study explores the relationship between cooling rate and microsegregation of directionally solidified ductile iron. The unidirectional heat transfer system used in this research is made up of a copper mold kept chilled by circulating water and embedded in the bottom of Furan sand mold. Thermocouples are connected to the computer measuring system to record the cooling curves of the castings at a distance of 0, 30, 60 and 90 mm from the chilled copper mold surface. Alloys including Mn, Cr, Cu, Ni and Ti were added to the specimens. Electron microprobe analysis (EPMA) was employed to examine distribution of elements between the dendrite arms and nodular graphite. Results show that unidirectional heat transfer affects directly the solidification mode and microstructure of the casting. The cooling curves reveal that local solidification time increases with increasing distance from the chilled copper mold surface. Different solidification rates with corresponding microstructure and element segregation were observed in the same unidirectionally solidified casting. Local solidification time was closely related to element segregation. The effective segregation coefficient (Keff) calculated using the Scheil equation was found to vary, according to the stage of solidification. The actual segregation characteristics of complex alloys generally follow the Scheil equation.http://www.doiserbia.nb.rs/img/doi/1450-5339/2013/1450-53391300034C.pdfdirectionally solidifiedmicro segregationductile iron |
| spellingShingle | Chang W.S. Lin C.M. Relationship between cooling rate and microsegregation in bottom-chilled directionally solidified ductile irons Journal of Mining and Metallurgy. Section B: Metallurgy directionally solidified micro segregation ductile iron |
| title | Relationship between cooling rate and microsegregation in bottom-chilled directionally solidified ductile irons |
| title_full | Relationship between cooling rate and microsegregation in bottom-chilled directionally solidified ductile irons |
| title_fullStr | Relationship between cooling rate and microsegregation in bottom-chilled directionally solidified ductile irons |
| title_full_unstemmed | Relationship between cooling rate and microsegregation in bottom-chilled directionally solidified ductile irons |
| title_short | Relationship between cooling rate and microsegregation in bottom-chilled directionally solidified ductile irons |
| title_sort | relationship between cooling rate and microsegregation in bottom chilled directionally solidified ductile irons |
| topic | directionally solidified micro segregation ductile iron |
| url | http://www.doiserbia.nb.rs/img/doi/1450-5339/2013/1450-53391300034C.pdf |
| work_keys_str_mv | AT changws relationshipbetweencoolingrateandmicrosegregationinbottomchilleddirectionallysolidifiedductileirons AT lincm relationshipbetweencoolingrateandmicrosegregationinbottomchilleddirectionallysolidifiedductileirons |