발간논문

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Vol.26, No.5, 498 ~ 507, 1988
Title
microstructural Development and Fracture Characteristics of Rene 80 in Low Cycle Fatigue
이효남Hyo Nam Lee, 윤병현Byoung Hyun Yoon, 황선근Sun Keun Hwang
Abstract
The effect of low cycle fatigue at 871℃ on the microstructure of Rene´ 80 was studied. The fatigue test was conducted in a push-pull, strain controlled mode with a frequency of 0.05 Hz. The relationship between the plastic strain range and the fatigue life was fitted with the Coffin-Manson model. The alloy showed a cyclic softening initially, which was followed by a steady state until failure. The softening was attributed to a preferrential shearing of secondary γ` precipitates. The dislocation characteristics varied from γ`/γ` localization to γ`/γ` interface misfit dislocations depending on the test condition. A local coarsening of γ` precipitates was also observes. The fatigue crack initiation at surface was accompanied by oxidation, and the mode of crack propagation was predominantly transgranular. The carbides and γ` precipitates were fairly stable against thermal exposures of up to 982℃/70 hrs.
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