발간논문

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Vol.35, No.6, 657 ~ 664, 1997
Title
Modeling for the prediction of threshold stress in oxide dispersion strenthened superalloy
변재원 , 최성배 , 권숙인 , 이재훈 Jai Won Byeon , S . B . Choi , S . I . Kwun , J . H . Lee
Abstract
The creep behavior of PM1000 alloy, ODS Ni-base superalloy with 0.6wt%Y₂O₃ was investigated in order to understand the role of dispersoids during high temperature creep deformation as a modeling alloy. Nimonic75 alloy which has no dispersoids but has almost the same chemical composition as PM1000 was selected as a reference alloy. Creep tests were performed at 800℃ 900℃ and 1000℃. In contrast to Nimonic75, the PM1000 alloy showed the threshold behavior at certain stress level under which no detectable creep strain proceeds, TEM observations indicated that there was an attractive interaction between particles and dislocations. A new model to predict the threshold stress in high temperature creep was proposed in this study. The predicted threshold stresses by this model agreed well with the experimental results.
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