발간논문

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Vol.29, No.5, 451 ~ 458, 1991
Title
Effect of Hf on Microstructures and High Temperature Low Cycle Fatigue characteristics of DS Rene 80 Alloy
현용택Yong Taek Hyun, 황선근Sun Keun Hwang, 최재호Jae Ho Choi, 김학민Hak Min Kim, 조종춘Jong Chun Cho
Abstract
The effects of Hf on microstructures and high temperature low cycle fatigue(LCF) behavior of directionally solidified Rene 80 (DS Rene 80) alloy were studied. LCF tests were conducted at 760℃, 871℃ and 982℃, respectively. The fatigue properties of Elf -modified DS Rene 80H alloy were superior to those of DS Rene 80 alloy under all experimental conditions. The beneficial effect of Elf was found to be twofold : it increased the resistance to crack propagation by changing the morphology of carbides from script-type to blocky-type, and suppressed the crack initiation by increasing the resistance to oxidation. Cyclic softening was observed during high temperature LCF tests. At 760℃, the mechanism for the cyclic softening was disordering of γ` preciptates due to dislocation shearing; at 982℃, it appeared to be mainly the loss of coherency between matrix and T`s and partly the coarsening of γ`s.
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