Micromechanical model of the high temperature cyclic behavior of 9–12%Cr martensitic steels

► A micromechanical model is proposed to render the cyclic softening effect of martensitic steels. ► The model is based on physically sounded microstructural evolutions. ► The model is able to reproduce the cyclic softening effect. ► The model can also partly render the minimum creep rate, multiaxia...

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Bibliographic Details
Published in:International journal of plasticity 2011-11, Vol.27 (11), p.1803-1816
Main Authors: Fournier, B., Sauzay, M., Pineau, A.
Format: Article
Language:English
Subjects:
bcc
Coarsening
Computer simulation
Condensed matter: structure, mechanical and thermal properties
Creep
Cyclic loading
Engineering Sciences
Exact sciences and technology
Fatigue (materials)
Fundamental areas of phenomenology (including applications)
Homogenizing
Inelasticity (thermoplasticity, viscoplasticity...)
Martensitic stainless steels
Martensitic steel
Materials
Mathematical models
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Micromechanical model
Physics
Softening
Softening effect
Solid mechanics
Steels
Structural and continuum mechanics
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Summary:► A micromechanical model is proposed to render the cyclic softening effect of martensitic steels. ► The model is based on physically sounded microstructural evolutions. ► The model is able to reproduce the cyclic softening effect. ► The model can also partly render the minimum creep rate, multiaxial loadings and fatigue–relaxation behavior. 9–12%Cr quenched and tempered martensitic steels are known to soften under cyclic loadings at high temperature. The present article proposes a model based on physical mechanisms described at the scale of slip systems. This model describes explicitly the microstructural recovery (corresponding to a decrease of the dislocation density and subgrain coarsening) observed experimentally. The scale transition is carried out in the framework of self-consistent homogenization schemes. The model assumptions and its physical basis are explicitly discussed. The parameters are identified on a very limited amount of experimental data. The model turns out to give very good predictions and extrapolations for the cyclic softening effect observed in uniaxial tension–compression loadings for strain ranges larger than 0.3%. Stress–relaxation and creep behavior can also be simulated for high stresses. In addition the cyclic softening effect is reproduced for multiaxial tension–torsion loadings.
ISSN:0749-6419
1879-2154
DOI:10.1016/j.ijplas.2011.05.007