Author： Beck T.
Publisher： Springer Publishing Company
ISSN： 1385-2000
Source： Mechanics of Time-Dependent Materials, Vol.6, Iss.3, 2002-01, pp. : 271-282
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Abstract
The effect of superimposed creep loadings on the cyclic deformation and the lifetime behaviour of the Ni-base superalloy IN 792 CC under out-of-phase TMF loadings is presented and discussed. The mean stress and the stress amplitude are not affected significantly by the creep loading. A slight cyclic hardening is observed even for cycles with superimposed creep loadings at a maximum temperature of 920°C which means that the work hardening processes occurring under TMF loading are not fully compensated by recovery during the creep phase. The plastic strain amplitude increases with increasing creep stress. Using the Manson–Coffin relationship, it is possible to calculate the influence of the superimposed creep loadings on the lifetime behaviour in good accordance with the experimental results.
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