全ひずみエネルギに基づくCo基鋳造耐熱合金の疲労・クリープ相互作用下の寿命評価

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This paper examines a life prediction method for a low strengh and high dictility material, cast Co base superalloy (10Ni-29Cr-7W-0.2Ti-0.25Nb-0.15Zr-0.40C-Co), under fatigue-creep interaction (FCI) conditions. We previously proposed a frequency modified total strain energy parament to evaluate failure lievea (N_f), crack initiation lives (N_c) and surface crak propagation behavior for high strength superalloy under FCI conditions. The frequency modified Total strain energy parameter was obtained from the total tensil strain energy (Δw_<rr>) and loading time (τ_<rr>) under tensile stress. this paper examines the suitability of applying the frequency modified total strain energy to life prediction and crack dropation dehavior evaluation for cast co base superalloy. We have found that not only crack initiation and failure lives, but also crack propagation behavior of cast Co base superalloy under FCI conditions can be estimated exactly by using the frequency modified total strain energy parameter.
1990-06-15