球状およびCV黒鉛鋳鉄の衝撃特性に及ぼす黒鉛の影響

概要

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This study aims to clarify the effects of graphite on the impact characteristics of cast irons from various viewpoints. A ferritic spheroidal graphite cast iron sample and a ferritic compacted vermicular (CV) graphite cast iron sample were prepared, and their Charpy impact characteristics were compared precisely with those of the Si cast steel sample whose microstructure and chemical composition are nearly similar to matrix of the cast iron samples. The impact energy in the ductile fracture region of the cast iron samples were recognized to be much less than that of the Si cast steel sample, and it was considered to be caused mainly by two reasons induced from graphite: one is decreasing of effective sectional area and the other one is internal notch effect. The transition temperatures of the cast iron samples were recognized to be much lower than that of the Si cast steel sample, and it was considered to be caused by the graphite which may act as the nucleus of dimples in ductile fracture. The impact energy in the brittle fracture region of the cast iron samples were recognized to be a little bit larger than that of the Si cast steel sample, and it was considered to be caused by graphite which act as a kind of buffer effect against crack growth in brittle fracture.
近畿大学の論文
2003-12-20