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High Temperature Creep Rupture Characteristics of Ni-Based Alloy718 Jointed by Friction Welding  

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. 58-63 More about this Journal
Abstract
The short-term high temperature creep rupture behavior of Ni-based Alloy718 steels jointed by friction welding wasinvestigated at the elevated temperatures 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 time 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 26.1, -22.4, 22.5, -18.5, 17.4, -14.3 and 6.9, -8.1, respectively. The stress exponents decreased with increasing creep temperature. The creep life prediction was derived by the Larson-Miller parameter (LMP) method and the result equation obtained is as follows: T(logtr+20)=-0.00148${\sigma}^2$-3.089${\sigma}$+23232. Finally, the results were compared with those of the base metal for Alloy718.
Keywords
Creep characteristics; Friction welding; Creep rupture time; Larson-Miller parameter LMP; Steady state creep rate(SSCR); Stress exponent;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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