衝撃試験における球状黒鉛鋳鉄及びSi鋳鋼の破面解析

概要

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This study aims to clarify the influence of graphite on impact fracture of ferritic spheroidal graphite cast iron (FDI) by means of comparing the fractography of FDI to that of silicon cast steel whose composition is same to that of the matrix of FDI. In ductile region, the impact value of FDI is lower than that of cast steel. It is because graphite nodules make not only the effective sectional area ratio of matrix decrease but also notch effect around graphite increase. In brittle region, however, the impact value of FDI is larger than that of cast steel. The impact transition temperature of FDI is much lower than that of steel, and the fracture surface of FDI at room temperature is more ductile than that of cast steel. It is because the graphite nodules tend to produce ductile fracture due to their function as nuclei of dimples.
近畿大学の論文
2005-12-20