Effect of the Number of Nodular Grains on Low Cycle Fatigue Life in Spheroidal Graphite Cast Iron

저사이클 피로수명에 영향을 미치는 구상흑연주철의 흑연입자수의 영향

Low cycle fatigue life of spheroidal graphite cast iron is determined by the morphological parameters of internal graphite. The aim of this study is to clarify the effect of the number of nodular grain of spheroidal graphite cast iron on low cycle fatigue life. Two specimens that have identical average nodular grain size by changing nodular grain volume fraction and different number of nodular grain count was tested. In this paper, the parameter governing fatigue life through fatigue test, the number of nodular grain seriously affect fatigue life and nodular grain size is no longer governing parameter of it.