Alloy Design on Microstructures and Mechanical Properties of As-Cast Ductile Cast Iron

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  • 鋳放状態球状黒鉛鋳鉄のミクロ組織および機械的性質の合金設計
  • イバナシ ジョウタイ キュウジョウ コクエン チュウテツ ノ ミクロ ソシキ

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Abstract

  The mechanical properties of ductile cast irons depend primarily upon their matrix structure. For the improvement of matrix structure, many researches on austempering process and alloy additions have been studied. But austempering process is too complex and make the cost higher. Therefore, the effect of alloying elements such as Ni, Mo and Cu on the microstructures of as-cast ductile cast iron were investigated in this study for 15 different compositions. The composition range of the alloying elements were Ni(0.0 to 4.0 mass %), Mo(0.0 to 0.6 mass %) and Cu(0.0 to 1.2 mass %). Prediction models for impact value and hardness were developed by regression analysis method (Response Surface Analysis). The result was well agreed with experimental value. While Ni and Cu improved hardness and reduced impact value, Mo increased impact value as well as hardness. The relationship between impact value and hardness were in directly inverse proportion.

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