Grain Refinement and Tensile Properties of Ferritic Spheroidal Graphite Cast Iron

DOI Web Site 2 Citations 22 References

Bibliographic Information

Other Title
  • フェライト球状黒鉛鋳鉄の結晶粒微細化と引張特性
  • 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

Search this article

Abstract

  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.

Journal

Citations (2)*help

See more

References(22)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top