フェライト球状黒鉛鋳鉄の結晶粒微細化と引張特性

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書誌事項

タイトル別名
  • Grain Refinement and Tensile Properties of Ferritic Spheroidal Graphite Cast Iron
  • フェライト キュウジョウ コクエン チュウテツ ノ ケッショウリュウ ビサイカ

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抄録

  This paper proposes the method of ferrite-grain refinement of the spheroidal graphite cast iron (s. g. iron) by heat treatment. The effects of the graphite nodule diameter and the ferrite grain size on the tensile properties of the resulting s. g. iron are also discussed in this study. The results obtained are as follows : (1) It is possible to convert into the s. g. iron with the mean ferrite grains of approximately 8μm in size by rapidly heating the iron with the uniform ferrite-pearlite fine-duplex structure just above the lower limit of the eutectoid transformation temperature range. (2) Ferrite-grain refinement of s. g. iron improves the tensile strength and the proof stress. The relationship between the yield stress and ferrite grain size follows the Hall-Petch relation. The yield-point phenomenon changes from continuous yielding to the yield drop with the decrease of ferrite grain size. (3) The improvement of the tensile strength and the proof stress resulting from the refinement of the graphite nodule depend highly on the strengthening of the matrix structure, as a consequence of grain refinement.

収録刊行物

  • 鋳造工学

    鋳造工学 69 (4), 309-315, 1997

    公益社団法人 日本鋳造工学会

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