Structural Diagram and Mechanical Properties of Nodular-Acicular Cast Iron

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  • ノジュラー・アシキュラー鋳鉄の組織図ならびに機械的性質
  • ノジュラー アシキュラー チュウテツ ノ ソシキズ ナラビニ キカイテキ セイシツ

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  Molten pig iron containing molybdenum and nickel was treated with an Fe-Si-Mg alloy, cast in a green sand mold and examined for the cast structures and mechanical properties.<br>  Combined effect of chemical analysis and section size on the attainment of an as-cast structure with nodular graphite and acicular matrix was studied and tha results were represented graphically.<br>  The hardness of a nodular-acicular cast iron increased as the section thickness decreased, as the nickel content increased, or as the molybdenum content decreased. This was due to the hardening of the ground mass of austenite containing martensite. Magnetic measurement revealed two different temperature ranges for decomposition of retained austenite during heating of an acicular cast iron. The tensile strength was improved considerably when the iron was annealed at the lower temperature range (250-350°C) for 10 hrs. The optimum toughness of the magnesium-alloy-treated acicular iron was obtained when the as-cast white iron was annealed for the first stage graphitization.

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