마찰용접된 니켈기 초내열합금 Alloy718의 고온 크리프 파단 특성
High Temperature Creep Rupture Characteristics of Ni-Based Alloy718 Jointed by Friction Welding
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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℃ 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℃ 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)=-0.00148σ2-3.089σ+23232. Finally, the results were compared with those of the base metal for Alloy718.
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℃ 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℃ 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)=-0.00148σ2-3.089σ+23232. Finally, the results were compared with those of the base metal for Alloy718.
참고문헌 (10)
- 권상우, "Alloy718 마찰접합조건의 최적화와 비파괴 평가", 한국해양공학회지, 22(1), pp.53~57 (2008), 한국해양공학회
- 권상우, "원자력 발전소용 밸브스탬재의 고온크리프 특성", 2008년도 한국해양과학 기술협의회 공동학술대회 논문집, pp.2418~2421 (2008)
- 김남용, "마찰용접한 Alloy718 및 SNCrW강의 기계적 성질", 2006년도 KWS 추계학술대회 발표논문집, pp.237~239 (2006)
- Endo, T., "Recent Advance in Creep Behavior Analysis and Its Application to Structural Materials", Materia Japan, 36, pp.225~231 (1996)
- Kim, I.S., "Characterization of Deformation Behavior for Waspaloy under Creep-Fatigue Interaction", Int. J. of Metals and Materials, 6(5), pp.407~413 (2000)
- Kim, S.J., "Statistical Properties of Creep Rupture Data Distribution for STS304 Stainless Steels", Materials Science and Engineering A, 483-484, pp.529~532 (2008)
- Kim, W.G., "Creep Characterization of Type 316LN and HT-9 Stainless Steels by the K-R Creep Damage Model", KSME Int. J., 15(11), pp.1463~1471 (2001)
- Kong, Y.S., "Creep Life Prediction of High Temperature Tube Materials for Power Plants", Key Engineering Materials, 261-263, pp.1115~1122 (2004)
- Larson, F.R, "A Time Temperature Relationship for Rupture and Creep Stresses", Transaction of the ASME, pp.765~775 (1952)
- Norton, F.H., "The Creep of Steel at High Temperatures", pp.67~ (1910), McGraw Bill