球状黒鉛鋳鉄の衝撃特性に及ぼす基地組織の影響

概要

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The influence of matrix microstructure on impact characteristics of ductile cast iron was investigated by using three kinds of heat-treated ductile cast irons whose matrix structures are ferrite, pearlite and bainite (ausferrite). The instrumented Charpy impact tests were carried out with un-notched and V-notched specimens in the temperature range from 123 K to 423 K. The results obtained are summarized as follows: In the ductile region, the impact value becomes larger in the order of pearlite, bainite and ferrite matrix, which is the same order in elongation, In the brittle region, the difference in matrix microstructure does not affect impact value. The impact transition temperature becomes lower in the order of pearlite, bainite and ferrite matrix. Addition of an external notch to impact specimens results in rising in transition temperature in every matrix. The external notch factor (impact value of un-notched specimen divided by impact value of notched specimen) becomes larger in the order of ferrite, pearlite and bainite matrix, which is the same order in hardness, and this means that a sample with a harder matrix is more largely affected by external notches.
近畿大学の論文
2004-12-20