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Viking Age brooch casting simulations.: A study of Viking age gating systems and pouring temperatures using modern simulation tools.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0002-5117-8330
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2013 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

   This report will discuss Viking age casting in sand molds. By examinations of a Viking age brooch and with the simulation program MAGMA5 one can set up simulations of the brooch being cast with realistic parameters.

   To be able to run the simulations in MAGMA5 a 3D-scanning of the original brooch was provided. This was to be used during the simulations. Based on examinations and literature studies, different plausible gating systems were designed around the brooch. The widely discussed mold venting or no venting was assessed in the cast systems as well as feeding placement and its influence. A variety of different cast systems were assessed to provide a large database for further discussion. Three melt temperatures and mold materials were evaluated on their influence on the results. Defects mechanisms were assessed and discussed on their probability to induce the defects found in the results.

   The simulations resulted in a large amount of data on the pouring and solidification of the same brooch under different circumstances. A pattern could easily be seen as to where defects generally occurred, even when casting under a wide variety of circumstances and cast system geometries.What could be concluded by these simulations is that the mold material of choice would be a highly permeable sand mold. Temperature of the poured melt would have been preferred to be as high as possible. This is to avoid cold flow and other mold filling difficulties linked to the liquid viscosity. A highly permeable mold would also compensate for the added gas pressure caused by zinc vapor formation at elevated melt temperatures. A good feeder placement would also render venting unnecessary because the feeder would act as a vent as well.

   The locations where defects generally form are almost independent of cast system geometry and more related to the cast geometry itself. Comparing the defect locations in the simulations with archeological findings one can see the same areas are often additionally worked and adorned after casting. This either by drilled holes or through added riveted ornamentation.

Place, publisher, year, edition, pages
2013. , 33 p.
Keyword [en]
mold material evaluation, simulation, cast defect locations, viking age, brooch, brooch casting, viking age casting technique, casting technique evaluation, ornamentation evolution, brass casting, sand mold
National Category
Metallurgy and Metallic Materials
URN: urn:nbn:se:kth:diva-123804OAI: diva2:631560
Subject / course
Materials and Process Design
Educational program
Master of Science in Engineering - Materials Design and Engineering
2013-05-15, Jernkontoret, Kungsträdgårdsgatan 10, Stockholm, 18:21 (English)
Available from: 2013-06-24 Created: 2013-06-18 Last updated: 2013-06-24Bibliographically approved

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