球状黒鉛鋳鉄の動的破壊靱性に及ぽす基地組織の影響

概要

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In this study, instrumented Charpy impact tests are carried out with ordinary thickness ductile cast irons containing various amounts of pearlite in order to examine the effect of matrix structure on the dynamic fracture toughness and crack growth behavior. CTOD is smaller and crack growth occurs more easily with increasing pearlite content in the matrix. The relationships between J(ΔC)and J(R) vary with pearlite content. For ferritic and ferritic-pearlitic materials, J(ΔC) is nearly equal to J(R) and these points are located near the Δa=0. 1mm point. For fully pearlitic material, however, J(ΔC) locates near the Δa = 0. 4mm point and overestimates the fracture toughness, while J(R) underestimates it from the view point of applied load. It is considered therefore that J(mid) is a reasonable measure for the fracture toughness of ductile cast irons, irrespective of the pearlite content in the matrix.
一般社団法人日本機械学会の論文
1993-01-25