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High Temperature Creep Rupture Characteristics of Ni-Based Alloy718  

Kwon, Sang-Woo (Department of Mechanical Design Engineering, Pukyong National University)
Kong, Yu-Sik (School of Mechanical Engineering, Pukyong National University)
Kim, Seon-Jin (School of Mechanical Engineering, Pukyong National University)
Publication Information
Journal of Ocean Engineering and Technology / v.22, no.6, 2008 , pp. 52-57 More about this Journal
Abstract
The short-term high temperature creep rupture behavior of Ni-based Alloy718 steel was investigated at the elevated temperatures range of 550 to $700^{\circ}C$ under constant stress conditions. The creep rupture characteristics such as creep stress, rupture time, steady state creep rate, and initial strain were evaluated. Creep stress has a quantitative correlation between creep rupture tim and steady state creep rate. The stress exponents (n, m) of the experimental data at 550, 600, 650 and $700^{\circ}C$ were derived as 33.5, -24.9, 26.1, -21.2, 16.8, -12.8 and 10, -8.2, respectively. The stress exponent decreased with increasing creep temperature. The creep lift prediction was derived by the Larson-Miller parameter (LMP) method and the resultant equation was obtained as follows: T($logt_r$+20)=-0.00252 ${\sigma}^2$-1.377${\sigma}$+-22718.
Keywords
Creepcharacteristics; Steady state creep rate; Creep rupture time; Larson-Miller parameter LMP; Initial strain;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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