バナジウムやチタンを含む鋳鉄に生成する異常黒鉛組織の生成過程

抄録

  Anomalous graphite structure such as unevenness of graphite at the graphite-matrix interface forms in the cast iron containing vanadium and titanium. The formation process of uneven graphite structure was investigated by the directional solidification method. Vanadium and titanium in the cast iron affected the stacking of graphite on the graphite basal plane. Unevenness of graphite structure was led by the disorder of stacking in the eutectic solidification stage and it was promoted during the cooling process from eutectic temperature to room temperature. The graphites at eutectic cell boundaries were more anomalous than those in the eutectic cells, because vanadium and titanium segregated at eutectic cell boundaries. Short and thick graphites were also observed at eutectic cell boundaries. This may be related to the segregation of vanadium and titanium.