大型鋳鋼品に生じるき裂欠陥予測技術に関する研究

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タイトル別名
  • Predicting Locations of Defects in the Solidification Process for Large-Scale Cast Steel
  • 大型鋼鋼品に生じるき裂欠陥予測技術に関する研究
  • オオガタ チュウコウヒン ニ ショウジル キレツ ケッカン ヨソク ギジュツ ニ カンスル ケンキュウ

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抄録

The large-scale cast steel has been used in broad fields of industries, such as power generation, construction, vessels, and automobiles. In the solidification process of a hummer used for press machine, for example, sometimes defects such as shrinkage cavity, segregation and cracks appear at hummer's surface. Shrinkage cavity and segregation can be predicted by performing non-steady state heat transfer analysis; and therefore such two types of defects can be eliminated by using chills which control solidification process. However, uneven cooling rates at different regions of the large-scale cast steel generate thermal stresses, which cause solidification cracks, between the chills. For causing those cracks, thermal stress may be important; however, there have been few studies for this thermal stress analysis. In this study, a three dimensional thermal elasto-plastic stress analysis has been performed by using finite element method in connection with three dimensional non-steady state heat transfer analysis, including interaction between the temperature and stress field. The results provide further understanding of the observed solidification crack failure for large-scale cast steel.

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