According to the working temperature and load of superalloy GH4049 in an aero-engine, we systematically study its high temperature mechanical behaviors that have crucial effects on component life. Creep tests are performed in the stress range of 137-600 MPa and the temperature range of 700-900 deg C. The strain-rate sensitivities (SRSs) under simple tension, fatigue and creep conditions are also analyzed in detail at 600 deg C, 768 deg C and 832 deg C, the working temperatures at typical positions on the turbine blade. Through creep experiments of GH4049 under single- and multistage loading conditions, we obtain the relationship between the minimum creep rate and the rupture time, the effect of high temperature strain recovery after creep and the effect of warm-working at high temperatures on the subsequent room-temperature strength. In the SRS analysis, we achieve the SRS indexes under different experimental conditions. Meanwhile, we generalize the SRS definition from simple tension to low-cycle fatigue (LCF) and multistage creep conditions, and verify the validity of these generalizations. The verifications illustrate that the SRS definitions in this paper can quantitatively describe the strain-rate dependence behaviors under LCF and multistage creep. All these fundamental works establish the basis of complex mechanical behavior simulations for GH4049 and the basis of the analysis of structural integrity and reliability.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Tensile creep behavior and strain-rate sensitivity of superalloy GH4049 at elevated temperatures


    Additional title:

    Kriechen unter Zugbeanspruchung und Dehngeschwindigkeitsempfindlichkeit der Superlegierung GH4049 bei hohen Temperaturen


    Contributors:
    Chen, Lijie (author)


    Publication date :

    2010


    Size :

    6 Seiten, 17 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Tensile Strain Hardening Behavior and Fractography of Superalloy GH39

    WANG Hui / CHENG Minghe / ZHANG Chengxiang et al. | DOAJ | 2016

    Free access

    High-cycle fatigue behavior of Co-based superalloy 9CrCo at elevated temperatures

    Wan, Aoshuang / Xiong, Junjiang / Lyu, Zhiyang et al. | British Library Online Contents | 2016


    Microstructure Evolution and Strain Features of a Single Crystal Nickel Base Superalloy during Tensile/Compression Creep

    Meng, F. L. / Tian, S. G. / Wang, M. G. et al. | British Library Conference Proceedings | 2007


    Tensile properties of rail steels at elevated temperatures

    Quick, G.W. | Engineering Index Backfile | 1932


    Tensile Creep Behaviors of a P-Type Structure Single Crystal Nickel-Base Superalloy

    Du, H. Q. / Tian, S. G. / Yu, X. F. et al. | British Library Conference Proceedings | 2007