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Investigation of dendrite coarsening in complex shaped lamellar graphite iron castings

Authors
  • Svidró, Péter
  • Diószegi, Attila
  • Pour, Mohsen Saffari
  • Jönsson, Pär
Publication Date
Jan 01, 2017
Identifiers
DOI: 10.3390/met7070244
OAI: oai:DiVA.org:hj-37108
Source
DiVA - Academic Archive On-line
Keywords
Language
English
License
Unknown
External links

Abstract

Shrinkage porosity and metal expansion penetration are two casting defects that appear frequently during the production of complex-shaped lamellar graphite iron components. These casting defects are formed during the solidification and usually form in the part of the casting which solidifies last. The position of the area that solidifies last is dependent on the thermal conditions. Test castings with thermal conditions like those existing in a complex-shaped casting were successfully applied to provoke a shrinkage porosity defect and a metal expansion penetration defect. The investigation of the primary dendrite morphology in the defected positions indicates a maximum intradendritic space, where the shrinkage porosity and metal expansion penetration defects appear. Moving away from the defect formation area, the intradendritic space decreases. A comparison of the intradendritic space with the simulated local solidification times indicates a strong relationship, which can be explained by the dynamic coarsening process. More specifically, long local solidification times facilitates the formation of a locally coarsened austenite morphology. This, in turn, enables the formation of a shrinkage porosity or a metal expansion penetration.

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