C. Caës

TL;DR: In this article, cyclic tests with or without tensile holding periods were conducted in air at 823 K on a modified 9Cr-1Mo martensitic steel and the relationship between the number of cycles to failure of pure fatigue tests and the cyclic strain range was established.

TL;DR: In this article, a study of the cyclic stress partitioning is presented, where the authors identify the microstructural mechanisms leading to the softening effect usually presented by martensitic steels under cyclic loadings.

TL;DR: In this article, the authors compared the cyclic behavior of various 9-12%Cr steels, both commercial grades and optimized materials, in terms of creep strength and found that all the tempered ferritic-martensitic steels suffer from a cyclic softening effect linked to the coarsening of the subgrains and laths.

TL;DR: In this paper, a model devoted to the prediction of the high temperature creep-fatigue lifetime of modified 9Cr-1Mo martensitic steels is proposed, which is built on the basis of the physical mechanisms responsible for damage due to the interaction of creep, fatigue and oxidation.

TL;DR: Fournier et al. as discussed by the authors used an enhanced stress partitioning method to evaluate the kinematic, isotropic and viscous parts of the cyclic stress of a martensitic steel tested at 823 K.