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This study aims to clarify the influence of external notch on impact characteristics of high toughness ductile cast irons prepared by austempering heat treatment. We produced ductile cast irons samples with various matrix microstructure tested by Charpy impact within five kinds of external notches whose stress concentration factors (α), with values taken from 1.0 (Unnotched) to 4.8. In addition, to clarify the initiation process of impact characteristics, we observed the evolution ofdoi:10.4236/msa.2017.813069 fatcat:rvvk5ozejfdujjxcrdqwppmsqi