Abstract
The flow between a casting and riser and the consequent macrosegregation development in an aluminium alloy is examined. The riser is designed using Campbell’s rules and solidification is simulated. The influence of cooling conditions and riser shape on macrosegregation patterns is studied. The relative importance of buoyancy and shrinkage induced flows is also simulated. For castings with a fixed riser shape, the average composition in the cast part increases due to the exchange of interdendritic fluid between the riser and the part. This exchange is smaller at higher solidification rates and when the bottom of the mould is chilled. Although the buoyancy induced flow does move some interdendritic liquid from the riser to the casting, shrinkage is more significant in increasing its average composition. A wider riser provides a barrier to flow, slowing the introduction of heavier interdendritic liquid from the riser into the casting, keeping it closer to the nominal composition.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
