High Temperature Creep Rupture Characteristics of Ni-Based Alloy718

니켈기 초내열합금 Alloy718의 고온 크리프 파단 특성

  • 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)
  • 권상우 (부경대학교 기계설계공학과 대학원) ;
  • 공유식 (부경대학교 기계공학부) ;
  • 김선진 (부경대학교 기계공학부)
  • Published : 2008.12.31

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

References

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