Metal Expansion Penetration During Solidification of Grey Cast Iron
1999 (English)Licentiate thesis, comprehensive summary (Other academic)
The meta! expansion penetration has been examined experimentally. The whole casting process was simulated using a commercial software, in order to investigate the solidification characteristics and the pore formation in the casting studied. In order to do this, a special module for cast iron was used, where nucleation and growth of all relevant phases are considered. During simulation it is possible to detect the areas where porosities are likely to be formed. The results of the experiments show that expansion penetration generally occurs in the same areas as detected in the simulation depending on the solidification path. The inoculation and solidification behaviour will result in an excess or deficiency of meta! at the end of solidification. This will lead to either meta! penetration or the formation of pores.
A series of test castings were produced at a foundry. They were used to study the influence of chemical composition, the type and amount of inoculant and the casting temperature. The results show that the carbon and phosphorus content had an influence on meta! penetration. The tendency for meta! penetration decreased whit decreasing carbon content as well as with increasing phosphorus content.
The experiments show that the type and amount of inoculant and casting temperature for grey cast iron influence the meta! expansion penetration in areas with late solidification and where the melt is in contact with the sand mould. The worst cases of meta! penetration were obtained with uninoculated melt. A !arge number of small eutectic cells making up a !arge fraction of the volume were observed, resulting in a !arge penetration.
Place, publisher, year, edition, pages
Linköping: Institutionen för konstruktions- och produktionsteknik , 1999. , 32 + 5 papers p.
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 761
Grey cast iron, solidification, solidification modelling, graphite expansion, molar volume, casting simulation, thennal analysis, thermoanalysis cup, casting temperature, inoculation, inoculant, meta! expansion penetration, eutectic cell size.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-30072Local ID: LiU-Tek-Lic 1999:19ISBN: 91-7219-465-0OAI: oai:DiVA.org:liu-30072DiVA: diva2:250893