Friction stress measurements during creep of Nimonic 105
作者： H. Burt , J. P. Dennison , B. Wilshire
DOI: 10.1179/MSC.1979.13.5.295
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摘要: AbstractWith Nimonic 105, the dependence of secondary creep rate es on stress σ and temperature T can be described ases = Aσn exp - Q c/RT with n ≃ 7 c 515 kJ mol−1. Using a technique which involves making consecutive small reductions during creep, definitive values friction σ0 determined such that these large rationalized A*(σ-σ0)4 */RT where *, derived from at constant (σ-σ0), is equal to activation energy for single phase nickel–chromium alloys (∼ 310 mol−1). This suggests processes occurring in matrix are rate-controlling nickel-base superalloys. Differences temperature-dependence resulting variations testing procedure shown attributable micro-structural instability. Furthermore, measurements conventional tests specimens were sub...
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