Abstract
Abstract To estimate the service life of the reactor internals made of 2.25Cr–1Mo steel in the high temperature gas-cooled reactor pebble-bed module demonstration plant, creep rupture test was performed on the simulated post weld heat treated steel at 773 K over a range of stress levels 300–200 MPa. It has been shown that the rupture time is 126–5532 h, correspondingly. Then, the service life under stress of 161.2 MPa at 648 K was calculated to be so long as 210,374,853 h (≈24,015 years). Four types of carbides M 3 C, M 2 C, M 7 C 3 and M 23 C 6 existed in both the steel plate and the post-rupture specimens. As the rupture time increases, the weight percentages of M 23 C 6 and M 2 C that are stable in thermodynamics in the post-rupture specimens increase while those of metastable M 3 C and M 7 C 3 decrease on the whole. During the long term creep exposure, the deformation promotes the precipitation of M 3 C, M 2 C and M 23 C 6 , according to the experimental results with the deformed and undeformed parts of the post-rupture specimens, but its influence on the weight percentage of M 7 C 3 seems rather complicated.
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