• Title/Summary/Keyword: 라손-밀러 파라미터

Search Result 6, Processing Time 0.025 seconds

Creep Life Prediction of Aircraft Gas Turbine material by ISM (ISM에 의한 항공기용 가스터빈 재료의 크리프 수명예측)

  • 공유식
    • Journal of Ocean Engineering and Technology
    • /
    • v.15 no.3
    • /
    • pp.43-48
    • /
    • 2001
  • In this paper, the real-time prediction of high temperature creep strength and creep for nickel-based superalloy Udimet 720 (high-temperature and high-pressure gas turbine engine materials) was performed on round-bar type specimens under pure load at the temperatures of 538, 649 and 704$^{\circ}C$. The predictive equation of ISM creep has better reliability than that of LMP and LMP-ISM, and its reliability is getting better for long time creep prediction ($10^3~10^5$h).

  • PDF

Creep Life Prediction of Aircraft Gas Turbine Material by ISM (ISM에 의한 항공기용 가스터빈 재료의 크리프 수명예측)

  • 공유식;오세규;윤한기
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
    • /
    • 2001.05a
    • /
    • pp.108-113
    • /
    • 2001
  • In this paper, the real-time prediction of high temperature creep strength and creep strength and creep life for nickel-based superalloy Udimet 720 (high-temperature and high-pressure gas turbine engine materials) was performed on round-bar type specimens under pure load at the temperatures of 538, 649 and 704$^{\circ}C$. The predictive equation of ISM creep has better reliability than that of LMP and LMP-ISM, and its reliability is getting better for long time creep prediction(10$^3$~10sup/5/h).

  • PDF

Creep Life Prediction of Elevated Temperature Materials for Pressure Vessel by ISM (ISM에 의한 압력용기용 고온재료의 크리프 수명예측)

  • Kong, Y.S.;Kim, H.K.;Oh, S.K.;Lim, H.K.
    • Journal of Power System Engineering
    • /
    • v.6 no.2
    • /
    • pp.40-47
    • /
    • 2002
  • In this paper, friction welding optimization for 1Cr0.5Mo-STS304 (${\phi}14\;mm$), AE applications for the weld quality evaluation and the applications of various life prediction methods such as LMP (Larson-Miller Parameter) and ISM (initial strain method) were investigated : The creep behaviors of those steels and the friction welded joints under static load were examined by ISM combined with LMP at 400, 500, 550 and $600^{\circ}C$, and the relationship between these two kinds of phenomena was studied. The real-time predicting equations of elevated-temperature creep life (rupture time) under any creep stress at any elevated-temperature could be developed by LMP and LMP-ISM. It was confirmed that the life prediction equations by LMP and LMP-ISM are effective only up to 102 h and can not be used for long times of 103-106 h, but by ISM it can be used for long times creep prediction of more than 104 h with most reliability.

  • PDF

Creep Life Prediction by ISM of Elevated Temperature Materials for Pressure Vessel(II) (압력용기용 고온재료의 ISM에 의한 크리프 수명예측(II))

  • 공유식;김헌경;황성필;김일석;오세규
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
    • /
    • 2001.05a
    • /
    • pp.307-313
    • /
    • 2001
  • In this Paper, friction welding optimization for 1Cr0.5Mo-STS304($\Phi$14mm), AE applications for the weld quality evaluation and the applications of various life prediction methods such as LMP(Larson-Miller Parameter) and ISM(initial strain method) were investigated : the creep behaviors of those steels and the friction welded joints under static load were examined by ISM combined with LMP at 400, 500, 550 and $600^{\circ}C$, and the relationship between these two kinds of phenomena was studied. The real-time predicting equations of elevated-temperature creep life(fracture time) under any creep stress at any elevated- temperature could be developed by LMP and LMP-ISM, It was confirmed that the life prediction equations by LMP and LMP-ISM are effective only up to 10$^2$hrs and can not be used for long times of 10$^3$-10$^{6}$ hrs, but by ISM it can be used for long times creep prediction of more than 10$^4$hrs with most reliability.

  • PDF

Evaluation on Creep Properties of Reduced Activation Ferritic Steel(RAFs) for Nuclear Fusion Reactor (핵융합로용 저방사화 철강재료(RAFs)의 크리프 특성평가)

  • 공유식;윤한기;남승훈
    • Journal of Ocean Engineering and Technology
    • /
    • v.18 no.2
    • /
    • pp.58-63
    • /
    • 2004
  • Reduced Activation Ferritic/Martensitic Steels (RAFs) are leading candidntes for structural materials of a D-T fusion reactor. One of the RAFs, JLF-l (9Cr-2W-V, Ta) has been developed and has shown to have good resistance against high-fluency neutrino irradiation and good phase stability. Recently, in order to clarify the strengthening mechanisms at high temperatures, a new scheme to improve high temperature mechanical properties is desired. Therefore, the test technique development of high temperature creep behaviors for this material is very important. In this paper, the creep properties and creep life prediction, using the Larson-Miler parameter method for JLF-l to be used for fusion reactor materials or other high temperature components, are presented at the elevated temperatures of 50$0^{\circ}C$, 55$0^{\circ}C$, $600^{\circ}C$, $650^{\circ}C$ and 704$^{\circ}C$. It was confirmed, experimentally and quantitatively, that a creep life predictive equation, at such various high temperatures, is well derived mr the LMP method.

Nondestructive Characterization for Remanent Life of Advanced Ferritic Steel by Reversible Permeability (가역투자율에 의한 첨단 페라이트강의 잔여수명에 대한 비파괴평가)

  • Hong, Seung-Pyo;Ryu, Kwon-Sang;Kim, Chung-Seok
    • Journal of the Korean Society for Nondestructive Testing
    • /
    • v.33 no.2
    • /
    • pp.181-186
    • /
    • 2013
  • We present nondestructive characterization for remanent life of advanced ferritic steels, next-gen energy facility materials by reversible permeability. The reversible permeability is based on the theory that the value of reversible permeability is the same differential of the hysteresis loop. The measurement principle is based on the foundation of harmonics voltage induced in a sensing coil using a lock-in amplifier tuned to the frequency of the exciting one. The peak interval of reversible permeability(PIRP), Vickers hardness, and tensile strength(TS) of the aged samples decreased with aging time. We could estimate the remanent life of advanced ferritic steel by using the relationship between the peak interval of reversible permeability and Larson-Miller parameter(LMP), non-destructively.