球状黒鉛鋳鉄の衝撃遷移曲線に及ぼす珪素，燐およびパーライト量の影響

抄録

  Commercial Spheroidal graphite cast irons with ferrite matrix are known to exhibit excellent ductility when tested statically at room temperature. However, this characteristics is not necessarily maintained when tested dynamically at various temperatures near room temperature.
  A series of experiments are being carried out as to the effects of various factors on the low temperature embrittlement behaviors of this type of irons. The present paper deals with the effects of Si and P contents and of the amount of pearlite.
  The results indicated that when the amounts of Si, P or pearlite are increased, the impact transition curves of the irons are shifted to the higher temperature side and the maximum absorbed energy is decreased.