組織の異なる球状黒鉛鋳鉄の疲労き裂進展特性

概要

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Fatigue crack propagation and crack closure have been investigated on spheroidal-graphite cast irons (SGI's) with four different microstructures, i. e., ferrite, pearlite, bull's eye and aus-ferrite. The crack propagation rates plotted against the stress intensity factor range showed the microstructure dependence due to a different contribution of crack closure. However, as crack closure was taken into account, the crack propagation rates became insensitive to the microstructures, indicating that the intrinsic propagation resistance was the same in all the microstructures studied. Furthermore, the published propagation data on SGI's with a wide variety of microstructures were reviewed, and an overall discussion is developed on the effect of microstructure on fatigue crack propagation.
一般社団法人日本機械学会の論文
1992-10-25