Comparison of residual stresses in sand- and chill casting of ductile cast iron wind turbine main shafts

Mads Rostgaard Sonne, J. O. Frandsen, Jesper Henri Hattel

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Abstract

In this work, simulations of pouring, solidification and cooling, and residual stress evolution of sand and chill cast wind turbine main shafts is performed. The models are made in the commercial software MAGMAsoft. As expected, the cooling rate of the sand casting is shown to be much lower than for the chill casting, resulting in a very course microstructure.From the simulations the nodule count is found to be 17 nodules per mm2 and 159 nodules permm2 for the sand and chill casting, respectively, in the critical region of the main bearing seat.This is verified from nodule counts performed on the real cast main shafts. Residual stressevaluations show an overall increase of the maximum principal stress field for the chill casting,which is expected. However, the stresses are found to be in compression on the surface of thechill cast main shaft, which is unforeseen.
Original languageEnglish
Article number012025
JournalI O P Conference Series: Materials Science and Engineering
Volume84
Number of pages10
ISSN1757-8981
DOIs
Publication statusPublished - 2015
Event14th International Conference on Modelling of Casting, Welding and Advanced Solidification Processes - Awaji island, Hyogo, Japan
Duration: 21 Jun 201526 Jun 2015
http://mcwasp2015.jp/

Conference

Conference14th International Conference on Modelling of Casting, Welding and Advanced Solidification Processes
Country/TerritoryJapan
CityAwaji island, Hyogo
Period21/06/201526/06/2015
Internet address

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