|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Creep-fatigue Damage Mechanism in Cyclically-Softened Mod.9Cr-1Mo Ferritic-Martensitic Steel
||Meimei Li, Weiying Chen, Ken Natesan
|On-Site Speaker (Planned)
Mod.9Cr-1Mo ferritic-martensitic steel is an important structural material in advanced sodium-cooled fast reactors. Creep-fatigue is a major concern for its applications in high-temperature nuclear reactors. Creep-fatigue interaction is a complex dynamic process involving combined effects of external temperature, loading and environmental variables and internal metallurgical variables, and is the most damaging and least understood mechanism in high temperature structural designs. Mod.9Cr-1Mo experiences softening under cyclic loading at elevated temperatures, in contrast to austenitic stainless steels that cyclically hardened and whose creep-fatigue behavior is well understood. Our recent study of creep-fatigue interaction in Mod.9Cr-1Mo at 550-600C revealed that the conventional creep-fatigue theory cannot explain the unique creep-fatigue response of cyclically-softened Mod.9Cr-1Mo steel. Instead, its creep-fatigue process can be well described by a thermally-activated deformation process, similar to the creep deformation. A new creep-fatigue life prediction model was developed for cyclically-softened Mod.9Cr-1Mo steel, which was linked with microstructural evolution under creep-fatigue loading.
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