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Evaluation of Fatigue Strength by Graphite in Ductile Cast Iron  

이경모 (거창기능대학 기계설계학과)
윤명진 (경일대학교 기계공학부)
이종형 (금오공과대학교 기계공학부)
Publication Information
Journal of the Korean Society for Precision Engineering / v.20, no.1, 2003 , pp. 214-221 More about this Journal
Abstract
In this study, based on the effect of the interaction of fracture mechanics by graphite and fatigue limit phenomena of the microscopic observation various matrix structure, spheroidal ratio, size of graphite and distribution etc. parameters containd with Ductile Cast Iron. Therefore, in this study, different ferrite-pearlite matrix structure and spheroidal ratio of graphite of 70%, 80% and 90%, GCD40, GCD45-1 and GCD45-2 series and three different ferrite-pearlite matrix structure, GCD 45-3, GCD 50, GCD 60 series, all of which contain more than 90% spheroidal ratio of graphite, were used to obtain the correlation between mean size of spheroidal graphite and fatigue strength. (1) 73% pearlite structure had the highest fatigue limitation while 36% pearlite structure had the lowest fatigue limitation among ferrite-pearlite matrix. the increase in spheroidal ratio with increasing fatigue limitation, 90% had the highest, 14.3% increasing more then 10%, distribution range of fatigue life was small in same stress level. (2) (equation omitted) of graphite can be used to predict fatigue limit of Ductile Cast Iron. The Statistical distribution of extreme values of (equation omitted) may be used as a guideline for the control of inclusion size in the steelmaking processes.
Keywords
size of graphite; ductile cast iron; ferrite-pearlite matrix structure; fatigue strength; spheroidal ratio of graphite;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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