圧延ロール用鋳鋼材の組織と静的機械性質の関係

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  • Relationship between Microstructure and Static Mechanical Properties of Cast Steel for Rolling Mill Rolls.
  • アツエン ロールヨウ チュウコウザイ ノ ソシキ ト セイテキ キカイ セイシツ ノ カンケイ

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The relationship between mechanical properties and microstructure, especially volume ratio of Pearlite and Bainite, has been investigated. Using three type of specimens which have experienced different heat-treatment, tensile properties and fracture toughness (KIC)have been evaluated. The tensile strength and elongation of 50% Bainite mixed structure showed the mean characteristics of Pearlite and Bainite, while its 0.2 proof stress showed similar value of Pearlite. The result of COD test showed that the charactristics of mixed structure is closer to 100% Pearlite, which is due to the plastic deformation of Pearlite at the edge of crack. Such difference of fracture mechanism is considered to cause the above results described.

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