Creep-fatigue interaction on estimation of lifetime and fatigue damage of F82H

In this study, creep-fatigue (CF) tests on F82H at 823 K were conducted according to the standard specimen and requirement of ASTM. Tension holding (TH) showed higher lifetime than compression holding (CH). Compared with 9Cr-1Mo-V steels, CF lifetime degradation was not observed at the holding time less than 0.05 h in case of CH and 0.17 h in case of TH. CF damages were summarized from the CF test results by Campbell method. The obtained damages distributed around CF damage envelope of Grade 91 in ASME NH. CF damage of cylindrical water-cooled ceramic breeder (WCCB) test blanket module (TBM) container at the zenith of hemisphere body under the ITER thermo-mechanical load was calculated. The calculated damage located within of the damage envelope of Grade 91. It was indicated that the present design of cylindrical WCCB TBM might resist CF interaction under the ITER thermo-mechanical load conditions.

Automated summary

This study conducted creep-fatigue tests on F82H at 823 K, comparing tension holding with compression holding. It was found that CF damages were within the damage envelope of Grade 91 in ASME NH, indicating the potential resistance of the cylindrical WCCB TBM design under ITER thermo-mechanical load conditions.