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Quantitative Evaluation for the Internal Defect Size Governing the Fatigue Life in Ductile Irons
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 Title & Authors
Quantitative Evaluation for the Internal Defect Size Governing the Fatigue Life in Ductile Irons
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 Abstract
In this study, the quantitative evaluation was performed by examination for gatigue crack origin in two prepared ductile irons specimens which have different microstructures using rotary bending fatigue tester, Series A has mixed microstructure. ferrite plus pearlite, and series B has bainitic microstructure. Obtained main results are as follows. The scatterings of fatigue strength were observed on σ(sub)α-Ν diagram of both specimen series, and it is observed that scatterings of series A were more serious. It is reasonable to evaluate the size of mesocrack range by means of √A(원문참조), where A means the area of mesocrack range including globular graphite nodule. As a result of reconsideration for the fatigue data by introduction of K(sub)α-Ν diagram, the scattrings of fatigue life were, remarkably. reduced. Therefore, it is more reasonable to evaluate of mesocrack range on fatigue life by parameter K(sub)α rather than σ(sub)α.
 Keywords
Fatigue(피로);Fatigue Life(피로수명);Internal Defet(내재결합);Mesocrack(메조크랙);Austempering(오스템퍼링);Ductile Irons(구상흑연주철);
 Language
Korean
 Cited by
 References
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