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http://dx.doi.org/10.3795/KSME-A.2017.41.8.721

Microstructure, Tensile Strength and Probabilistic Fatigue Life Evaluation of Gray Cast Iron  

Sung, Yong Hyeon (Dept. of Mechanical Design Engineering, Hanyang Univ.)
Han, Seung-Wook (Dept. of Mechanical Engineering, Hanyang Univ.)
Choi, Nak-Sam (Dept. of Mechanical Engineering, Hanyang Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.41, no.8, 2017 , pp. 721-728 More about this Journal
Abstract
High-grade gray cast iron (HCI350) was prepared by adding Cr, Mo and Cu to the gray cast iron (GC300). Their microstructure, mechanical properties and fatigue strength were studied. Cast iron was made from round bar and plate-type castings, and was cut and polished to measure the percentage of each microstructure. The size of flake graphite decreased due to additives, while the structure of high density pearlite increased in volume percentage improving the tensile strength and fatigue strength. Based on the fatigue life data obtained from the fatigue test results, the probability - stress - life (P-S-N) curve was calculated using the 2-parameter Weibull distribution to which the maximum likelihood method was applied. The P-S-N curve showed that the fatigue strength of HCI350 was significantly improved and the dispersion of life data was lower than that of GC300. However, the fatigue life according to fatigue stress alleviation increased further. Data for reliability life design was presented by quantitatively showing the allowable stress value for the required life cycle number using the calculated P-S-N curve.
Keywords
Gray Cast Iron; Microstructure Analysis; Rotary Bending Fatigue Test; P-S-N Curve;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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