한국해양공학회지 (Journal of Ocean Engineering and Technology)

  • 제22권6호
  • /
  • Pages.58-63
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  • 2008
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  • 1225-0767(pISSN)
  • /
  • 2287-6715(eISSN)
한국해양공학회 (Korean Society of Ocean Engineers)
권호 표지

마찰용접된 니켈기 초내열합금 Alloy718의 고온 크리프 파단 특성

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

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

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.

키워드

참고문헌

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